Researcher Database

Ewa Kowalska
Institute for Catalysis Photocatalysis Research Division
Associate Professor

Researcher Profile and Settings


  • Institute for Catalysis Photocatalysis Research Division

Job Title

    Associate Professor

Academic & Professional Experience

  • 2012/11 - Today    Hokkaido UniversityCatalysis Research Centerassociate professor
  • 2009/09 - 2012/10    FAU & Ulm University, GermanyInstitute of Inorganic ChemistryMarie Curie fellow
  • 2005/04 - 2009/08    Hokkaido UniversityCatalysis Research CenterJSPS & GCOE fellow
  • 2004/05 - 2007/09    Gdansk University of Technology, PolandFaculty of Chemistry, Department of Chemical Technologyresearcher


  • 1998/10 - 2004/06  Gdansk University of Technology, Poland  Faculty of Chemistry  Ph.D. thesis “Investigations of photochemical degradation of organic compounds”, 28.06.2004
  • 2001/11 - 2002/08  University of Paris Sud, France  Department of Physical Chemistry  Marie Curie fellowship
  • 1993/09 - 1998/06  Gdansk University of Technology, Poland  Faculty of Chemistry  MSc in Environmental Protection, MSc thesis "Photochemical destruction of methoxychlor"

Research Activities

Published Papers

  • Ewa KowalskaWei Z., Janczarek M., Endo M., Balčytis A., Nitta A., Mendez Medrano M.G., Colbeau-Justin C., Juodka-zis S., Ohtani B., Kowalska E.
    Applied Catalysis B: Environmental 237 574 - 587 2018/11 [Refereed][Not invited]
     Research paper (scientific journal)
  • Bajorowicz B., Kowalska E., Nadolna J., Wei Z., Endo M., Niedziółka J., Ohtani B., Zaleska-Medynska A.
    Dalton Transactions in press 2018/10 [Refereed][Not invited]
     Research paper (scientific journal)
  • Markowska-Szczupak A., Rokicka P., Wang K., Endo M., Morawski A.W., Kowalska E.
    Catalysts 8 (8) 316  2018/08 [Refereed][Not invited]
     Research paper (scientific journal)
  • Marcin Janczarek, Kunlei Wang, Ewa Kowalska
    Catalysts 8 240  2018/08 [Refereed][Not invited]
     Research paper (scientific journal)
  • Endo M., Janczarek M., Wei Z., Markowska-Szczupak A., Ohtani B., Kowalska E.
    J. Nanosci. Nanotechnol. 9 829 - 849 2018/03 [Refereed][Invited]
     Research paper (scientific journal)
  • P. Parnicka, P. Mazierski, T. Grzyb, W. Lisowski, E. Kowalska, B. Ohtani, A. Zaleska-Medynska and J. Nadolna
    Beilstein J. Nanotech. 9  447 - 459 2018/07 [Refereed][Not invited]
     Research paper (scientific journal)
  • Wysocka I., Kowalska E., Trzciński K., Łapiński M., Klimczuk T., Nowaczyk G, Zielińska-Jureka A
    Nanomaterials 8 (28) 2018/01 [Refereed][Not invited]
  • Wang K., Wei Z., Ohtani B., Kowalska E.*
    Catalysis Today in press 2017/12 [Refereed][Not invited]
     Research paper (scientific journal)
  • Wei Z., Janczarek M., Endo M., Colbeau-Justin C., Ohtani B., Kowalska E.*
    Catalysis Today in press 2017/12 [Refereed][Not invited]
     Research paper (scientific journal)
  • Wei Z., Endo M., Wang K., Charbit E., Markowska-Szczupak A., Ohtani B., Kowalska E.,*
    Chem. Eng. J. 318 121 - 134 2017/11 [Refereed][Not invited]
  • Marcin Janczarek, Ewa Kowalska
    Catalysts 7 317  2017/10 [Refereed][Not invited]
     Research paper (scientific journal)
  • Luna A.L., Dragoe D., Wang K., Beaunier P., Kowalska E., Ohtani B., Bahena U.D., Valenzuela M.A., Remita H., Colbeau-Justin C.
    J. Phys. Chem. C 121 (26) 14302 - 14311 2017/10 [Refereed][Not invited]
  • Parnicka P., Mazierski P., Grzyb T., Wei Z., Kowalska E., Ohtani B., Klimczuk T., Nadolna J.
    J. Catal. 353 211 - 222 2017/09 [Refereed][Not invited]
     Research paper (scientific journal)
  • Wei Z., Kowalska E.,* Wang K., Colbeau-Justin C., Ohtani B.
    Catalysis Today 280 29 - 36 2017/02 [Refereed][Not invited]
     Research paper (scientific journal)
  • Wei Z., Rosa L., Wang K., Endo M., Juodkazis S., Ohtani B., Kowalska E.*
    Applied Catalysis B: Environmental 206 393 - 405 2017/05 [Refereed][Not invited]
     Research paper (scientific journal)
  • Janczarek M., Wei Z., Endo M., Ohtani B., Kowalska E.*
    J. Photon. Energy 7 (012008) 1 - 16 2017/01 [Refereed][Invited]
     Research paper (scientific journal)
  • Méndez-Medrano M.G., Kowalska E., Lehoux A., Herissan A., Ohtani B., Rau S., Colbeau-Justin C., Rodríguez-López J.L., Remita H.
    J. Phys. Chem. C 120 (43) 25010 - 25022 2016/12 [Refereed][Not invited]
     Research paper (scientific journal)
  • Rokicka P., Markowska-Szczupak A.*, Kowalczyk L., Kowalska E., Morawski A.W.
    18 (4) 56 - 64 2016/12 [Refereed][Not invited]
     Research paper (scientific journal)
  • Nischk M., Mazierski P., Wei Z., Siuzdak K., Koume N., Kowalska E., Remita H., Zaleska-Medynska A.
    Appl. Surf. Sci. 387 89 - 102 2016/08 [Refereed][Not invited]
     Research paper (scientific journal)
  • Zheng S., Wang K., Wei Z., Yoshiiri K., Braumuller M., Rau S., Ohtani B., Kowalska E.*
    J. Adv. Oxid. Technol. 19 208 - 217 2016/07 [Refereed][Invited]
     Research paper (scientific journal)
  • Luna A.L., Novoseltceva E., Louarn E., Beaunier P., Kowalska E., Ohtani B., Velenzuela A., Remita H., Colbeau-Justin C.
    Applied Catalysis B: Environmental 191 18 - 28 2016/04 [Refereed][Not invited]
     Research paper (scientific journal)
  • Méndez-Medrano M.G., Kowalska E., Lehoux A., Herissan A., Ohtani B., Bahena D., Briois V., Colbeau-Justin C., Rodríguez-López J.L., Remita H.
    J. Phys. Chem. C 120 5143 - 5154 2016/02 [Refereed][Not invited]
     Research paper (scientific journal)
  • Marcin Janczarek, Ewa Kowalska, Bunsho Ohtani
    Chem. Eng. J.  - . 2016 [Refereed][Not invited]
  • S. Zheng, Z. Wei, K. Yoshiiri, M. Braumuller, B. Ohtani, S. Rau, E. Kowalska
    Photochem. Photobiol. Sci, 15 69 - .79 2016/01 [Refereed][Not invited]
  • Reszczynska J., Grzyb T., Wei Z., Klein M., Kowalska E., Ohtani B., Zaleska A.
    Applied Catalysis B 181 825 - 837 2015/09 [Refereed][Not invited]
     Research paper (scientific journal)
  • Markowska-Szczupak A., Wang K., Rokicka P., Endo M., Wei Z., Ohtani B., Morawski A.W., Kowalska E.
    J. Photochem. Photobiol. B 151 54 - 62 2015 [Refereed][Not invited]
     Research paper (scientific journal)
  • Zielinska-Jurek A., Wei Z., Wysocka I., Szweda P., Kowalska E.,
    Appl. Surf. Sci. 353 317 - 325. 2015 [Refereed][Not invited]
  • Z. Wei, E. Kowalska, J. Verrett, C. Colbeau-Justin, H. Remita, B. Ohtani
    Nanoscale 7 12392 - 12404 2015 [Refereed][Not invited]
     Research paper (scientific journal)
  • The effect of water activity and titania P25 photocatalyst on inactivation of pathogenic fungi
    A. Markowska-Szczupak, K. Janda, K. Wang, A.W. Morawski, E. Kowalska
    Central European Journal of Public Health 23 (3) 267 - 271 2015 [Refereed][Not invited]
     Research paper (scientific journal)
  • E. Kowalska, Z. Wei, B. Karabiyik, A. Herissan, M. Janczarek, M. Endo, A. Markowska-Szczupak, H. Remita, B. Ohtani
    Catalysis Today 252 136 - 142 2015 [Refereed][Not invited]
     Research paper (scientific journal)
    Molecules (Web) 19 (12) 19573 - 19587 1420-3049 2014/12 [Not refereed][Invited]
  • Ewa Kowalska, Ewa Kowalska, Kenta Yoshiiri, Zhishun Wei, Shuaizhi Zheng, Evelyn Kastl, Hynd Remita, Bunsho Ohtani, Bunsho Ohtani, Sven Rau
    Applied Catalysis B: Environmental 178 133 - 143 09263373 2014/07 [Not refereed][Not invited]
    © 2014 Elsevier B.V. Plasmonic photocatalysts were prepared by deposition of 2wt% of gold or silver nanoparticles (NPs) on commercial titania particles with different structural properties. Ruthenium(II) complexes with phosphonic and carboxylic acid binding groups were synthesized and adsorbed on bare titania and noble metal-modified titania. The structural properties of the samples were characterized by DRS, XPS, XRD, STEM, TLC, 1H NMR and 2D-COSY. Large surface area, small crystallite sizes, low pH value, nature of the deprotected phosphonate binding groups, and pre-deposited nanoparticles of noble metals enhanced the adsorption yield. Modification caused titania activation toward visible light (>450nm) for 2-propanol oxidation and for methanol dehydrogenation under UV/vis irradiation. The modified samples exhibited enhanced activity under UV/vis irradiation for acetic acid oxidation depending on the kind of modifiers and properties of titania, i.e., 2-6, 3-9 and 1-3-fold enhancement was observed after modification with NPs of gold, NPs of silver and Ru(II) complex. The time-resolved microwave conductivity (TRMC) method proved that higher photocatalytic activity of modified titania under UV irradiation was caused by scavenging of mobile electrons by NPs of noble metals, and therefore decreasing the recombination between charge carriers. The photocatalytic activity of hybrid photocatalysts under UV/vis was influenced by the nature of the plasmonic metal and structural properties of the metal and titania, e.g., crystallite size and polymorphic form. Different kinds of action were observed for two plasmonic metals in two reaction systems under UV irradiation, e.g., modification with an Ru(II) complex caused 12-times faster dehydrogenation of methanol for silver-modified large anatase titania (ST41) and hardly changed the activity of gold-modified samples, while during acetic acid oxidation, only hybrid photocatalysts composed of gold NPs and Ru(II) complex exhibited a slight increase of photocatalytic activity (1.1-1.3 times). The difference between gold and silver hybrid photocatalysts might have been caused by differences in surface charges of metallic deposits, i.e., the surface of silver NPs was mainly positively charged, while gold was zero-valent. Therefore, it is thought that the Ru(II) complex bound also to the surface of positively charged silver. Under visible light irradiation, fine titania modified with an Ru(II) complex exhibited the highest level of photocatalytic activity. The presence of an Ru(II) complex highly enhanced photocatalytic activity of titania modified with plasmonic NPs. However, NPs of plasmonic metals hindered the photoactivity of Ru(II)-titania.
  • Silver modified titania with enhanced photocatalytic and antiseptic properties under UV and visible light irradiation
    E. Kowalska, Z. Wei, B. Karabiyik, B. Ohtani, A. Markowska-Szczupak, H. Remita
    8th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA8), June 25-28, 2014, Thessaloniki, Greece (PC-2-29) 132 - 135 2014/06 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Hybrid photocatalysts composed of plasmonic titania and ruthenium complexes for oxidation of organic compounds
    E. Kowalska, K. Yoshiiri, Z. Wei, S. Zheng, E. Kastl, S. Rau, B. Ohtani
    8th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications (SPEA8), June 25-28, 2014, Thessaloniki, Greece (PC-2-31) 110 - 112 2014/06 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Zhishun Wei, Ewa Kowalska, Ewa Kowalska, Bunsho Ohtani, Bunsho Ohtani
    Chemistry Letters 43 (3) 346 - 348 03667022 2014/03 [Not refereed][Not invited]
    Titania samples containing octahedral anatase particles (OAPs) were prepared by the ultrasonication-hydrothermal process of partially proton-exchanged potassium titanate nanowires. It was found that increase in the ultrasonication time changed the product morphology, with other structural properties such as specific surface area, crystalline size, and crystallinity remaining almost constant. The results of photocatalytic activity tests for those samples suggested higher activity of a sample with higher OAP content, especially for reactions in the presence of oxygen. © 2014 The Chemical Society of Japan.
  • E. Kowalska, M. Janczarek, M. Janczarek, L. Rosa, S. Juodkazis, B. Ohtani
    Catalysis Today 230 131 - 137 09205861 2014/01 [Not refereed][Not invited]
    Titania powders were surface modified with gold and/or silver nanoparticles (NPs) by photodeposition method. Gold modified titania exhibited much higher photocatalytic activity during methanol dehydrogenation under UV irradiation than titania modified with monometallic silver and bimetallic Au-Ag NPs. Bimetallic photocatalysts exhibited either enhanced or reduced visible light activity, depending on properties of noble metal NPs, sequence of their deposition on titania, and properties of host titania. Though numerical simulation (3D-FDTD) showed strong plasmonic field enhancement at the interface between titania and bimetallic core(Au)-shell(Ag) NP, it is thought that co-deposition caused an enhancement of charge carriers recombination (by electron sinking in nearby second metal) inhibiting photoactivity under visible light irradiation. The highest level of photoactivity showed large rutile NPs with successively deposited metals, mainly in the form of individual monometallic NPs, due to size/shape polydispersity of deposited NPs, and thus with ability of light absorption in a broad wavelength range. © 2013 Elsevier B.V.
  • Development of plasmonic photocatalysts for environmental application
    E. Kowalska, Z. Wei, B. Karabiyik, M. Janczarek, M. Endo, K. Wang, P. Rokicka, A. Markowska-Szczupak, B. Ohtani
    Adv. Sci. Technol. 93 174 - 183 2014 [Refereed][Not invited]
     Research paper (scientific journal)
  • Plasmonic photocatalysts for environmental applications
    E. Kowalska, L. Rosa, A. Markowska-Szczupak, S. Judkazis, B. Ohtani
    CRC International Symposium “New Challenges on the Bio-interfaces: Structures and Dynamics”, 5-6 February, 2013, Sapporo, Japan 51 - 54 2013/02 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Modification of titanium dioxide with metal nanoparticles induced by radiolysis: application in photocatalysis
    H. Remita, Z. Hai, S. Sorgues, C. Colbeau-Justin, E. Grabowska, A. Zaleska, E. Kowalska
    Second International Conference on Advanced Oxidation Processes. AOP-2012, October 5-8, 2012, Kottyam, India 17 - 18 2012/10 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Plasmonic photocatalysts for degradation of organic compounds
    E. Kowalska, S. Rau, L. Rosa, S. Juodkazis, B. Ohtani
    Second International Conference on Advanced Oxidation Processes. AOP-2012, October 5-8, 2012, Kottyam, India 10 - 12 2012/10 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Ewa Kowalska, Sven Rau, Bunsho Ohtani
    Journal of Nanotechnology 16879503 2012/07 [Not refereed][Not invited]
    Plasmonic titania photocatalysts were prepared by titania modification with gold by photodeposition. It was found that for smaller amount of deposited gold (0.1wt%), anatase presence and large surface area were beneficial for efficient hydrogen evolution during methanol dehydrogenation. After testing twelve amounts of deposited gold on large rutile titania, the existence of three optima for 0.5, 2 and 6wt% of gold was found during acetic acid degradation. Under visible light irradiation, in the case of small gold NPs deposited on fine anatase titania, the dependence of photoactivity on gold amount was parabolic, and large gold amount (2wt%), observable as an intensively coloured powder, caused photoactivity decrease. While for large gold NPs deposited on large rutile titania, the dependence represented cascade increase, due to change of size and shape of deposited gold with its amount increase. It has been thought that spherical/hemispherical shape of gold NPs, in comparison with rod-like ones, is beneficial for higher level of photoactivity under visible light irradiation. For all tested systems and regardless of deposited amount of gold, each rutile Au/TiO2 photocatalyst of large gold and titania NPs exhibited much higher photoactivity than anatase Au/TiO2 of small gold and titania NPs. Copyright © 2012 Ewa Kowalska et al.
  • Photocatalysis by gold-loaded titania particles under visible-light irradiation
    B. Ohtani, E. Kowalska
    International Conference on the Nanostructure-Enhanced Photo-Energy Conversion, June 3-6, 2012, Tokyo, Japan P12002 1 - 4 2012/06 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Mono- and bimetallic plasmonic photocatalysts for degradation of organic compounds under UV and visible light irradiation
    E. Kowalska, S. Rau, B. Ohtani
    6th IWA Specialist Conference Oxidation Technologies for Water and Wastewater Treatment, May 7-9, 2012, Goslar, Germany 11 - 12 2012/05 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Vygantas Mizeikis, Ewa Kowalska, Saulius Juodkazis
    Journal of Nanoscience and Nanotechnology 11 (4) 2814 - 2822 15334880 2011/12 [Not refereed][Not invited]
    We report results of theoretical simulations of optical field enhancement in a system consisting of spherical and hemispherical noble metal nanoparticles on a smooth titania surface, which is a model system relevant to applications in photo-catalysis and solar energy harvesting. Simulations conducted using Finite-Difference Time-Domain (FDTD) technique reveal presence of resonant optical extinction bands at visible wavelengths, whose optical scattering is weak, but the associated localization and intensity enhancement of optical near-field are significant. For hemispheres, the field is strongly localized at the metal-substrate interface, where intensity enhancement of up to 104 times is reached. Moreover, the field is predominantly polarized along the normal to the substrate. These findings indicate potential of the hemisphere-substrate system for applications relying on optically promoted charge transport through the metal-substrate interface, such as photochemical reactions and light-to-current conversion. The results of theoretical analysis are compared with reported experimental data on photo-catalytic reactions. Copyright © 2011 American Scientific Publishers.
  • L. Rosa, K. Sun, E. Kowalska, S. Juodkazis
    International Quantum Electronics Conference and Conference on Lasers and Electro-Optics Pacific Rim 2011 (Optical Society of America, 2011), August 28, 2011, Sydney, Australia Article number 6194053 658 - 660 2011/08 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Searching for new photocatalysts for the decomposition of contaminants in water using the multi N/C 2100 TOC analyzer
    Ewa Kowalska, Sven Rau, Christian Koch
    Labo 06 28 - 31 2011/06 [Refereed][Not invited]
     Research paper (bulletin of university, research institution)
  • Anna Zielińska-Jurek, Ewa Kowalska, Ewa Kowalska, Janusz W. Sobczak, Wojciech Lisowski, Bunsho Ohtani, Adriana Zaleska
    Applied Catalysis B: Environmental 101 (3-4) 504 - 514 09263373 2011/01 [Not refereed][Not invited]
    The Au-TiO2 and Ag/Au-TiO2 nanoparticles have been prepared using a water-in-oil microemulsion system of water/AOT/cyclohexane and water/Triton X-100/cyclohexane. The obtained photocatalysts were subsequently characterized by a BET method, DRS spectroscopy, X-ray photoelectron emission spectroscopy (XPS), scanning transmission electron microscopy (STEM) and X-ray powder diffraction analysis (XRD). For gold-doped titanium (IV) oxide nanoparticles the effect of reducing agent and stabilizer on gold particles size and photocatalytic activity were observed. The effect of crystalline form of TiO2 and gold nanoparticles size on photocatalytic activity of Au-TiO2 and Ag/Au-TiO2 in visible light were also investigated. The photocatalytic activity of noble metals modified-TiO2 powders under visible light irradiation was estimated by measuring the decomposition rate of phenol in an aqueous solution. The best photocatalytic activity revealed samples with large gold particles (∼90nm) deposited on small titania nanoparticles. It was also found that the bimetallic samples (Ag/Au-TiO2) showed a higher photodegradation rate in visible region than monometallic photocatalysts. © 2010 Elsevier B.V.
  • Ewa Kowalska, Sven Rau
    Recent Patents on Engineering 4 242 - 266 18722121 2010/12 [Not refereed][Invited]
    Photochemical oxidation of organic and inorganic pollutants is rapidly becoming an attractive technique for water purification and wastewater treatment. Since artificial sources of light require much energy delivery, this method is recommended for toxic contaminants in a specific concentration range below the recommended levels for recovery and above the levels for conventional biological treatment. Selection of a light source and an oxidation system and determination of key-parameters play an important role in the treatment efficiency. Sufficient UV penetration into the radiated liquid is of crucial importance; especially for an opaque environment the UV radiation is only available very close to the UV lamp surface. High mass transfer rates for efficient interaction between the pollutant and the photocatalyst and for high oxygen uptake at the gas-liquid interface is another requirement for practical applications. In this regard, reactor design for efficient wastewater treatment has been a challenging problem. Many types of photoreactors have already been studied, reported and patented. This paper presents a revision of some conventional and novel photoreactors equipped with UV/vis lamps or working under solar radiation for wastewater treatment in laboratory and industrial scales. © 2010 Bentham Science Publishers Ltd.
  • Vygantas Mizeikis, Ewa Kowalska, Bunsho Ohtani, Saulius Juodkazis
    Physica Status Solidi - Rapid Research Letters 4 (10) 268 - 270 18626254 2010/10 [Not refereed][Not invited]
    We report theoretical simulations of plasmonic near-field enhancement and polarization in a system consisting of an asymmetric spheroidal Ag nanoparticle on a smooth dielectric surface. Finite-difference time-domain (FDTD) simulations reveal resonant optical extinction bands whose near-field is concentrated at the metal-substrate contact point with intensity enhancement by a factor of 103 and predominant polarization along the normal to the surface. These features may help explain enhanced photo-catalytic activity observed for colloidal Au and Ag nanoparticles on titania substrates.Electron microscopy image of Ag-nanoparticles on titania and the used model for numerical FDTD simulations.(© 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Numerical simulations of plasmonic near-field enhancement at the interface between an asymmetric spheroidal nanoparticle and a smooth dielectric surface show dominant contribution from the light field polarized perpendicularly to the interface; for the incident light polarized parallel to it. The intensity enhancement factor can reach 1000. The enhancement of the field polarized across the interfaces is expected to facilitate photo-catalytic charge transport. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
  • Anna Zielińska, Ewa Kowalska, Ewa Kowalska, Ewa Kowalska, Janusz W. Sobczak, Izabela Łacka, Maria Gazda, Bunsho Ohtani, Jan Hupka, Adriana Zaleska
    Separation and Purification Technology 72 (3) 309 - 318 13835866 2010/05 [Not refereed][Not invited]
    A series of Ag-TiO2 photocatalysts were obtained in microemulsion system (water/AOT/cyclohexane), using several Ag precursor amounts ranging from 1.5 to 8.5 mol.%. The photocatalysts' characteristics by X-ray diffraction, STEM microscopy, UV-vis spectroscopy, X-ray photoelectron spectroscopy, BET methods showed that a sample with the highest photo- and bioactivity had anatase structure, about 90 m2/g specific surface area, absorbed light over 400 nm and contained 1.64 at.% of silver (0.30 at.% of Ag0 and 1.34 at.% of Ag2O) and about 13 at.% of carbon in the surface layer. The photocatalytic activity of the catalysts was estimated by measuring the decomposition rate of phenol in 0.21 mM aqueous solution under visible and ultraviolet light irradiation. The bioactivity of silver-doped titanium dioxide nanocomposites was estimated using bacteria Escherichia coli and Staphylococcus aureus, yeast Saccharomyces cerevisiae and pathogenic fungi belonging to Candida family. All modified powders showed localized surface plasmon resonance (LSPR) in visible region with almost the same position of LSPR peaks indicating that similar sizes of silver, regardless of used amount of Ag, is deposited on titania particles during microemulsion method. STEM microscopy revealed that almost 50% of observed silver nanoparticles deposited at the TiO2 surface are in the range from 5 to 10 nm. © 2010 Elsevier B.V. All rights reserved.
  • Ewa Kowalska, Ewa Kowalska, Orlando Omar Prieto Mahaney, Ryu Abe, Bunsho Ohtani
    Physical Chemistry Chemical Physics 12 (10) 2344 - 2355 14639076 2010/03 [Not refereed][Not invited]
    Fifteen commercial titania (titanium(iv) oxide; TiO2) powders were modified with gold by photodeposition to prepare photocatalysts that work under irradiation with light in the visible range (vis). The gold-modified titania (Au/TiO2) powders were characterized by diffuse reflectance spectroscopy (DRS), field-emission scanning electron microscopy (FE-SEM), scanning transmission microscopy (STEM) and X-ray powder diffraction (XRD). It was shown that all tested powders could absorb visible light with an absorption maximum at localized surface plasmon resonance (LSPR) wavelengths (530-600 nm) and that the size and shape of gold nanoparticles determined the absorption ranges. The photocatalytic activity of Au/TiO2 powders was examined both under ultraviolet and vis irradiation (mainly >450 nm) for acetic acid and 2-propanol photooxidation. It was found that the activity depended strongly on gold and titania properties, such as particle size and shape, surface area and crystalline form. Under vis irradiation, large rutile particles loaded with gold particles of a wide range of sizes showed the highest level of photocatalytic activity, possibly due to greater light absorption ability in a wide wavelength range resulting from transverse and longitudinal LSPR of rod-like gold particles. Action spectrum analyses showed that visible-light-induced oxidation of organic compounds by aerated gold-titania suspensions was initiated by excitation of LSPR absorption of gold. Although photocatalytic activity of nanosized gold particles under vis irradiation with a wavelength of ca. 430 nm and catalytic activity of gold-modified titania during dark reactions were also found, it was shown that the activities of Au/TiO 2 particles originated from activation of LSPR of gold by light of wavelength of 530-650 nm. Participation of molecular oxygen as an electron acceptor and titania as a conductor of electrons is suggested by comparing with results obtained under deaerated conditions and results obtained using a system containing gold-deposited silica instead of gold-titania, respectively. On the basis of these results, the mechanism of visible-light-induced oxidation of organic compounds on gold-titania is proposed. © 2010 the Owner Societies.
  • Modification of titanium dioxide with gold for photocatalysis under UV and visible light irradiation
    E. Kowalska, R. Abe, B. Ohtani
    2nd International Symposium on Advanced Particles (ISAP-2009), April 26-29, 2009, Yokohama, Japan 141 - 142 2009/04 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Ewa Kowalska, Ewa Kowalska, Ryu Abe, Bunsho Ohtani
    Chemical Communications (2) 241 - 243 13597345 2009/01 [Not refereed][Not invited]
    Action spectrum analyses showed that visible light-induced oxidation of 2-propanol by aerated gold-modified titanium(iv) oxide (titania) suspensions is initiated by excitation of gold surface plasmon, and polychromatic irradiation experiments revealed that the photocatalytic reaction rate depends strongly on properties of titania, such as particle size, surface area and crystalline form (anatase or rutile) and on properties of gold deposits, such as size and shape. © The Royal Society of Chemistry.
  • Paulina Górska, Adriana Zaleska, Ewa Kowalska, Tomasz Klimczuk, Janusz W. Sobczak, Ewa Skwarek, Władysław Janusz, Jan Hupka
    Applied Catalysis B: Environmental 84 (3-4) 440 - 447 09263373 2008/12 [Not refereed][Not invited]
    A series of TiO2 photocatalysts were obtained using several calcination temperatures ranging from 350 to 750 °C. The photocatalysts' characteristics by X-ray diffraction, UV-vis and FTIR diffuse reflectance spectroscopies, X-ray photoelectron spectroscopy, BET and BJH methods showed that sample active in vis region had anatase structure, about 200 m2/g specific surface area, absorbed light for λ > 400 nm and contained 10.1 at.% of C-C species. The photocatalytic activity of the catalysts was estimated by measuring the decomposition rate of phenol in 0.21 mM aqueous solution in visible and ultraviolet light. The experimental data clearly indicate correlation between the absorption intensity of irradiation by obtained powders and their photocatalytic performance in phenol degradation. An increase in absorbance over the entire vis region and the highest photocatalytic activity for phenol degradation in visible light (λ > 400 nm) occurred for photocatalyst calcinated at 350 °C. Photocatalyst processed at 450 °C had the best activity in UV light (250 < λ < 400 nm). © 2008 Elsevier B.V. All rights reserved.
  • Model studies on degradation of selected pesticides in samples of process wastewater
    M. Grynkiewicz, G. Dembska, G. Sapota, A. Flasinska, S. Wisniewski, B. Aftanas, E. Kowalska
    Ecology and Technology 3 (94) 106 - 113 2008/03 [Refereed][Not invited]
     Research paper (scientific journal)
  • E. Kowalska, E. Kowalska, E. Kowalska, H. Remita, C. Colbeau-Justin, J. Hupka, J. Belloni
    Journal of Physical Chemistry C 112 1124 - 1131 19327447 2008/01 [Not refereed][Not invited]
    TiO2 (commercial-P25 and synthesized by sol-gel method) was surface modified with platinum ions or [Pt3(CO)6] 6 2- clusters to improve its photocatalytic activity. The physical properties of the synthesized photocatalysts were examined by transmission electron microscopy (TEM), X-ray diffraction (XRD), and Brunauer, Emmett and Teller adsorption (BET) methods. To characterize the absorption ability of visible light, the diffusion reflectance spectra (DRS) were recorded. The charge-carrier lifetimes in TiO2 after UV illumination were determined by microwave absorption experiments using the time-resolved microwave conductivity (TRMC) method. The photocatalyst activity was examined by degradation of exemplary aqueous phase pollutants, such as Rhodamine B and phenol. The impact of the adsorbates on the photocatalytic activity depends strongly on the titania precursor (commercial or synthesized), the irradiation wavelength (UV or visible), and the model compound (dye or phenol). The results show that it is possible to enhance the P25 photocatalytic activity under UV-visible light by doping it with Pt clusters. Also, P25 doping with Pt(II) or Pt clusters results in enhancement of the activity under visible light. Pt(IV)/TiO2 synthesized by sol-gel method exhibits better photoactivity under UV-visible and visible light compared to the unmodified titania. In all mentioned systems, a positive effect of modification with platinum clusters and, in particular, an important enhancement in photocatalytic activity under visible light were obtained. These results are explained by enhancement in visible light absorption and inhibition of charge-carrier recombination. © 2008 American Chemical Society.
  • A. Zaleska P. Gorska, E. Kowalska, J. Hupka
    Polish Journal of Chemical Technology 8 (2) 102 - 105 2006/08 [Refereed][Not invited]
     Research paper (scientific journal)
  • Treatment of wastewater from production of wood panels
    J. Hupka, M. Janczarek, R. Aranowski, A. Zaleska, M. Chrzanowska, E. Kowalska
    Selected Aspects of Production of Wood Derivatives Materials, Tleń, November 17-18, 2005, Tlen, Po-land 1 - 7 2005/11 [Refereed][Not invited]
     Research paper (research society, symposium materials, etc.)
  • Investigation of biological and photochemical treatment of municipal landfill leachates
    M. Chrzanowska, E. Kowalska, J. Hupka
    IWA Specialized Conference: Nutrient Management in Wastewater Treatment Processes and Recycle Streams, 19-21 September, 2005, Cracow, Poland 1107 - 1111 2005/09 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Visible light activity of TiO2 modified with thioacetamide
    P. Gorska, E. Kowalska, A. Zaleska, J. Hupka
    Second European Conference on Oxidation and Reduction Technologies for Ex-situ and In-situ Treatment of Water, Air and Soil (ECOR-2), June 12-15, 2005, Güttingen, Germany 191 - 192 2005/06 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • The TiO2–assisted photodegradation in gas phase
    Ewa Kowalska, Adriana Zaleska
    Przegląd Komunalny 6 (29) 76 - 77 2005/06 [Refereed][Not invited]
     Research paper (scientific journal)
  • Characterization and treatment of industrial pesticide wastewater
    E. Kowalska, M. Chrzanowska, M. Janczarek, A. Blaszke, J. Hupka
    Global Symposium on Recycling, Waste Treatment and Clean Technology (REWAS 2004), September 26-29, 2004, Madrid, Spain 2883 - 2884 2004/09 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • E. Kowalska, M. Janczarek, J. Hupka, Marzena Grynkiewicz
    Water Science and Technology 49 261 - 266 02731223 2004/04 [Not refereed][Not invited]
    Photodegradation of organic pesticides in industrial wastewater was examined in a UV/H2O2/air system. An experimentally determined optimal amount of hydrogen peroxide (0.008% v/v) indicates that hydrogen peroxide concentration controlled the efficiency of photodegradation. Pre-treatment operations such as sedimentation, filtration and coagulation were used to obtain better efficiency of pesticide removal and to cut down on irradiation time. Finally, scale-up experiments in the air-sparged hydrocyclone (ASH) reactor were carried out. After 5 min irradiation of 100 dm3 industrial wastewater almost all pesticides were destroyed. Thus the ASH reactor proved to be an effective contactor for carrying out photochemical reactions. © IWA Publishing 2004.
  • Titania modification for photocatalytic wastewater treatment
    E. Kowalska, H. Remita, J. Hupka, J. Belloni
    8th International Conference on TiO2 Photocatalysis: Fundamentals and Applications (TiO2-8), October 26-29, 2003, Montreal, Quebec, Canada 107 - 108 2003/10 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • H2O2/UV enhanced degradation of pesticides in wastewaters
    E. Kowalska, M. Janczarek, J. Hupka, M. Grynkiewicz
    3rd International Conference on Oxidation Technologies for Water and Wastewater Treatment (AOP’3), May 18-22, 2003, Goslar, Germany 374 - 379 2003/05 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Titania doping for catalytic wastewater treatment
    E. Kowalska, H. Remita, J. Hupka, J. Belloni
    3rd International Conference on Oxidation Technologies for Water and Wastewater Treatment (AOP’3), May, 18-22, 2003, Goslar, Germany 885 - 890 2003/05 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Photochemical degradation of xylene
    M. Budzisz, E. Kowalska, M. Pertkiewicz-Piszcz
    3rd International Conference on Oil Pollution „Prevention, Characterization, Clean Technology, Septem-ber 8-11, 2002, Gdansk, Poland II 134 - 138 2002/11 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • H. Tyszkiewicz, M. Biziuk, J. Hupka, A. Zaleska, E. Kowalska (Artuna)
    Ecological Chemistry and Engineering. S 8 (8-9) 941 - 946 2001/08 [Refereed][Not invited]
     Research paper (scientific journal)
  • Photodegradation of Phenol in Gas-sparged Reactor
    Ewa Kowalska (Artuna), Jan Hupka
    7th Meeting of the Central and East European Section of SECOTOX, October 24-28, 2000, Bratislava, Slovakia 199 - 201 2000/10 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Determination of organochlorines pesticides during degradation in a gas-sparged reactor
    E. Kowalska (Artuna), A. Zaleska, J. Hupka
    Fifth International Symposium on Exhibition on Environmental Contamination in Central and Eastern Europe, September 12-14, 2000, Prague, Czech Republic 83 - 88 2000/09 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Ewa Kowalska (Artuna), Jan Hupka
    Central European Journal of Public Health 8 (44) 88 - 89 2000/08 [Refereed][Not invited]
     Research paper (scientific journal)
  • Photochemical degradation of organic contaminants in aqueous phase
    Ewa Kowalska (Artuna), Jan Hupka
    2nd Conference on Ecological Achievement in Chemical Industry, October 14-15, 1999, Torun, Poland 174 - 182 1999/10 [Refereed][Not invited]
     Research paper (research society, symposium materials, etc.)
  • H2O2/UV/air oxidation of organic contaminants in the gas-sparged cyclone reactor
    Ewa Kowalska (Artuna), Jan Hupka
    6th Meeting of the Central and Eastern European Regional Section, September, 19-23, 1999, Balatonfőldvár, Hungary 103 - 105 1999/09 [Refereed][Not invited]
     Research paper (international conference proceedings)
  • Photocatalytic Degradation of Almost Non-soluble Organics in Gas-sparged Reactor
    J. Hupka, A. Zaleska, E. Kowalska, R. Bokotko, H. Tyszkiewicz, M. Biziuk
    EF Conference Environmental Technology for Oil Pollution, August 29- September 3, 1999, Jurata, Poland II 37 - 42 1999/08 [Refereed][Not invited]
     Research paper (international conference proceedings)

Books etc

  • Noble metal nanoparticles
    Kowalska E., Endo M., Wei Z., Wang K., Janczarek M. (NANOSCALE MATERIALS IN WATER PURIFICATION)
    Elsevier 2018/10 9780128139264 Contributor
  • Band-gap engineering of photocatalysts: surface modification versus doping
    Kowalska E., Wei Z., Janczarek M. (Visible-Light-Active Photocatalysis: Nanostructured Catalyst Design, Mechanisms and Applications. ed. S. Ghosh)
    Wiley 2018/05 978-3-527-34293-8 Contributor
  • Plasmonic photocatalysis
    Ewa Kowalska (Gold nanoparticles for physics, chemistry and biology. eds.: C. Louis & O. Pluchery. 2nd edition)
    World Scientific 2017/03 978-1-78634-124-2 46 Contributor
  • Influence of post-treatment operations on structural properties and photocatalytic activity of octahedral anatase particles prepared by hydrothermal method
    Wei Z., Kowalska E.,* Ohtani B. (Photocatalysis: Fundamentals, Materials and Potential. ed.: P. Pichat.)
    MDPI, Basel 2016/07 978-3-03842-183-2 14 Contributor
  • Silver-gold nano-composites for photo-catalytic and sensing applications, In: Silver Nanoparticles: Synthesis, Uses and Health Concerns
    E. Kowalska, Y. Nishijima, L. Rosa, S.Juodkazis ()
    Nova Science Publishers 2013 978-1-62808-402-3 Contributor
  • Development of application of photocatalysts, In: Latest Trends in Plasmonic Nanomaterials
    B. Ohtani, E. Kowalska ()
    CMC Publishing 2009 978-4-7813-0132-7 9 Contributor
  • Application of spectroscopic method for characterization of Ag-TiO2 nanocomposites. In: Science and In-dustry - Spectroscopic Methods in Practice (Nauka i przemysł - metody spektroskopowe w praktyce)
    A. Zielisnka, A. Zaleska, I. Lacka, M. Gazda, E. Kowalska, J. Hupka ()
    UMCS Lublin 2008 4 Contributor
  • UV/VIS light-enhanced photocatalysis for water treatment and protection. In: Soil and Water Pollution Monitoring, Protection and Remediation
    J. Hupka, A. Zaleska, M. Janczarek, E. Kowalska, P. Górska, R. Aranowski ()
    Springer 2005 10 1-4020-4727-4 11 Contributor
  • Determination and pathways of nitrogen during wastewater treatment. In: Pathways of pollutants and miti-gation strategies of their impact on the ecosystems.
    M. Chrzanowska, E. Kowalska, J. Hupka ()
    Komit. Inż. Środow. PAN, Lublin 2004 9 Contributor
  • Pathways and degradation of chloroorganic pesticides. In: Pathways of pollutants and mitigation strategies of their impact on the ecosystems
    A. Zaleska, E. Kowalska, J. Hupka ()
    Komit. Inż. Środow. PAN, Lublin 2004 15 Contributor

Conference Activities & Talks

Educational Activities

Teaching Experience

  • Advanced Course in Environmental Catalytic Chemistry I
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 環境科学院
    キーワード : 光触媒,光酸化分解,超親水化現象,励起電子─正孔,構造と光触媒活性,高活性化,可視光応答 Photocatalyst, Photoinduced oxidative decomposition, Super hydrophilicity, Excited electron-positive hole, Structure-activity correlation, Higher photocatalytic activity, Visible-light response
  • Advanced Course in Environmental Catalytic Chemistry II
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 環境科学院
    キーワード : Scientific Writing; Literature on Environmental Catalytic Chemistry; Manuscript Preparation, Data Presentation, Manuscript Edition
  • Course in Materials Science Ⅱ
    開講年度 : 2017
    課程区分 : 修士課程
    開講学部 : 環境科学院
    キーワード : chemical thermodynamics, chemical kinetics

Copyright c MEDIA FUSION Co.,Ltd. All rights reserved.