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  1. Article ; Online: Impact of Reaction Parameters and Water Matrices on the Removal of Organic Pollutants by TiO 2 /LED and ZnO/LED Heterogeneous Photocatalysis Using 365 and 398 nm Radiation

    Máté Náfrádi / Tünde Alapi / Gábor Bencsik / Csaba Janáky

    Nanomaterials, Vol 12, Iss 5, p

    2022  Volume 5

    Abstract: In this work, the application of high-power LED 365nm and commercial, low-price LED 398nm for heterogeneous photocatalysis with TiO 2 and ZnO photocatalysts are studied and compared, focusing on the effect of light intensity, photon energy, quantum yield, ...

    Abstract In this work, the application of high-power LED 365nm and commercial, low-price LED 398nm for heterogeneous photocatalysis with TiO 2 and ZnO photocatalysts are studied and compared, focusing on the effect of light intensity, photon energy, quantum yield, electrical energy consumption, and effect of matrices and inorganic components on radical formation. Coumarin (COU) and its hydroxylated product (7-HC) were used to investigate operating parameters on the • OH formation rate. In addition to COU, two neonicotinoids, imidacloprid and thiacloprid, were also used to study the effect of various LEDs, matrices, and inorganic ions. The transformation of COU was slower for LED 398nm than for LED 365nm , but r 0 7-HC /r 0 COU ratio was significantly higher for LED 398nm . The COU mineralization rate was the same for both photocatalysts using LED 365nm , but a significant difference was observed using LED 398nm . The impact of matrices and their main inorganic components Cl − and HCO 3 − were significantly different for ZnO and TiO 2 . The negative effect of HCO 3 − was evident, however, in the case of high-power LED 365nm and TiO 2 , and the formation of CO 3 •− almost doubled the r 0 7-HC and contributes to the conversion of neonicotinoids by altering the product distribution and mineralization rate.
    Keywords hydroxyl radical ; carbonate radical ; matrix effect ; coumarin ; neonicotinoid ; Chemistry ; QD1-999
    Subject code 333 ; 290
    Language English
    Publishing date 2022-12-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article: Photoelectrochemical Behavior of PEDOT/Nanocarbon Electrodes: Fundamentals and Structure–Property Relationships

    Kormányos, Attila / Csaba Janáky / Dorottya Hursán

    Journal of physical chemistry. 2018 Mar. 15, v. 122, no. 25

    2018  

    Abstract: In this study, we investigated the photoelectrochemical behavior of poly(3,4-ethylenedioxythiophene) (PEDOT)/carbon nanotube (CNT) and PEDOT/graphene nanocomposite photoelectrodes for the first time. Electrodeposition allowed control of both the ... ...

    Abstract In this study, we investigated the photoelectrochemical behavior of poly(3,4-ethylenedioxythiophene) (PEDOT)/carbon nanotube (CNT) and PEDOT/graphene nanocomposite photoelectrodes for the first time. Electrodeposition allowed control of both the composition and the morphology (as demonstrated by both transmission and scanning electron microscopy images) and also ensured an intimate contact between the PEDOT film and the nanocarbon scaffold. The effect of CNT and graphene on the photoelectrochemical behavior of the nanocomposite samples was studied by linear sweep photovoltammetry, incident photon-to-charge-carrier conversion efficiency measurements, and long-term photoelectrolysis coupled with gas-chromatographic product analysis. We demonstrated that the nanocarbon framework facilitated efficient charge carrier transport, resulting in a 4-fold increase in the measured photocurrents for the PEDOT/CNT electrode, compared to the bare PEDOT counterpart. The presented results contribute to the better understanding of the enhanced photoelectrochemical behavior of organic semiconductor/nanocarbon electrode assemblies and might encourage other researchers to study these intriguing hybrid materials further.
    Keywords electric current ; electrodes ; gas chromatography ; graphene ; nanocomposites ; nanotubes ; physical chemistry ; researchers ; scanning electron microscopy ; semiconductors
    Language English
    Dates of publication 2018-0315
    Size p. 13682-13690.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.8b00145
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Polyaniline films photoelectrochemically reduce CO₂ to alcohols

    Hursán, Dorottya / Attila Kormányos / Krishnan Rajeshwar / Csaba Janáky

    Chemical communications. 2016 July 7, v. 52, no. 57

    2016  

    Abstract: In this communication, we demonstrate that polyaniline, the very first example of an organic semiconductor, is a promising photocathode material for the conversion of carbon dioxide (CO₂) to alcohol fuels. CO₂ is a greenhouse gas; thus using solar energy ...

    Abstract In this communication, we demonstrate that polyaniline, the very first example of an organic semiconductor, is a promising photocathode material for the conversion of carbon dioxide (CO₂) to alcohol fuels. CO₂ is a greenhouse gas; thus using solar energy to convert CO₂ to transportation fuels (such as methanol or ethanol) is a value-added approach to simultaneous generation of alternative fuels and environmental remediation of carbon emissions. Insights into its unique behavior obtained from photoelectrochemical measurements and adsorption studies, together with spectroscopic data, are presented. Through a comparative study involving various conducting polymers, a set of criteria is developed for an organic semiconductor to function as a photocathode for generation of solar fuels from CO₂.
    Keywords adsorption ; alcohol fuels ; alternative fuels ; carbon ; carbon dioxide ; cathodes ; chemical reactions ; emissions ; ethanol ; greenhouse gases ; methanol ; polymers ; remediation ; semiconductors ; solar energy ; spectral analysis ; value added
    Language English
    Dates of publication 2016-0707
    Size p. 8858-8861.
    Publishing place The Royal Society of Chemistry
    Document type Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/c6cc04050k
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Modulation of Charge Recombination in CsPbBr3 Perovskite Films with Electrochemical Bias

    Scheidt, Rebecca A / Csaba Janáky / Gergely F. Samu / Prashant V. Kamat

    Journal of the American Chemical Society. 2018 Jan. 10, v. 140, no. 1

    2018  

    Abstract: The charging of a mesoscopic TiO2 layer in a metal halide perovskite solar cell can influence the overall power conversion efficiency. By employing CsPbBr3 films deposited on a mesoscopic TiO2 film, we have succeeded in probing the influence of ... ...

    Abstract The charging of a mesoscopic TiO2 layer in a metal halide perovskite solar cell can influence the overall power conversion efficiency. By employing CsPbBr3 films deposited on a mesoscopic TiO2 film, we have succeeded in probing the influence of electrochemical bias on the charge carrier recombination process. The transient absorption spectroscopy experiments conducted at different applied potentials indicate a decrease in the charge carrier lifetimes of CsPbBr3 as we increase the potential from −0.6 to +0.6 V vs Ag/AgCl. The charge carrier lifetime increased upon reversing the applied bias, thus indicating the reversibility of the photoresponse to charging effects. The ultrafast spectroelectrochemical experiments described here offer a convenient approach to probe the charging effects in perovskite solar cells.
    Keywords electrochemistry ; silver ; silver chloride ; solar cells ; spectroscopy ; titanium dioxide
    Language English
    Dates of publication 2018-0110
    Size p. 86-89.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.7b10958
    Database NAL-Catalogue (AGRICOLA)

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