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Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation

Abstract

A TiO2–ZnO binary oxide system (with molar ratio TiO2:ZnO = 8:2) was synthesized by a hydrothermal method, assisted by calcination at temperatures of 500, 600 and 700 °C, using zinc citrate as the precursor of ZnO. The morphology (SEM, TEM), crystalline structure (XRD, Raman spectroscopy), diffuse reflectance spectra (DRS), chemical surface composition (EDXRF), porous structure parameters (low-temperature N2 sorption) and characteristic functional groups (FT-IR) of the TiO2–ZnO oxide materials were comprehensively analyzed. The novelty of this work is the observation of the coexistence of the crystalline structures of anatase and ZnTiO3 in TiO2–ZnO oxide materials. Moreover, it is shown that the obtained materials absorb visible radiation. The key stage of the study was the evaluation of the photocatalytic activity of the TiO2–ZnO binary oxide systems in the degradation of model organic pollutants: C.I. Basic Red 1, C.I. Basic Violet 10, C.I. Basic Blue 3 and 4-nitrophenol. For all synthesized materials, a high efficiency of degradation of the model organic impurities was demonstrated. The results show that the synthesized products may be materials of interest for use in the degradation of organic pollutants. Moreover, the kinetics of the photocatalytic degradation of selected organic compounds were determined based on the Langmuir–Hinshelwood equation, assuming a pseudo-first-order (PFO) reaction.

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Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY no. 25, edition 1572-8757, pages 309 - 325,
ISSN: 0929-5607
Language:
English
Publication year:
2019
Bibliographic description:
Kubiak A., Siwińska-Ciesielczyk K., Bielan Z., Zielińska-Jurek A., Jesionowski T.: Synthesis of highly crystalline photocatalysts based on TiO2 and ZnO for the degradation of organic impurities under visible-light irradiation// ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY. -Vol. 25, (2019), s.309-325
DOI:
Digital Object Identifier (open in new tab) 10.1007/s10450-019-00011-x
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