Enhanced photocatalytic performance of tungsten-based photocatalysts for degradation of volatile organic compounds: a re
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REVIEW PAPER
Enhanced photocatalytic performance of tungsten‑based photocatalysts for degradation of volatile organic compounds: a review Qiang Cheng1 · Gao‑Ke Zhang1 Received: 13 May 2020 / Revised: 14 June 2020 / Accepted: 15 June 2020 © The Nonferrous Metals Society of China 2020
Abstract Photocatalytic oxidation process for the degradation of volatile organic compounds (VOCs) contaminants is a promising technology. But until now, the low photocatalytic activity of the conventional TiO2 photocatalyst under visible-light irradiation hinders the deployment of this technique for VOCs degradation. W O3 has been proved to be a suitable photocatalytic material for degradation of various VOCs as its appropriate band-gap, high stability and great capability. Nevertheless, the actual implementation of WO3 is still restricted by short lifetime of photoexcited charge carriers and low light energy conversion efficiency: its photocatalytic performance is needed to be improved. This review discusses the process of tungsten-based photocatalyst for removal of VOCs and summarizes a variety of strategies to improve the VOCs oxidation performances of WO3, such as controlling the morphology structure, engendering chemical defects, coupling heterojunction, doping suitable dopants and loading a co-catalyst. In addition, the practical application of tungsten-based photocatalyst is discussed. Keywords Tungsten trioxide · Photocatalytic oxidation · Volatile organic compound degradation · Modification
1 Introduction Volatile organic compounds (VOCs), which mainly contain alkanes, aromatics, alkenes, carboxylic acids, esters and alcohols [1], have been proven to seriously damaged environment and human health owning to their toxic carcinogenesis and environmental destructiveness such as photochemical smog, greenhouse effect and stratospheric ozone depletion. To solve this problem, several effective VOC elimination techniques such as adsorption [2], ozonation [3], chemical combustion [4], biological degradation [5] and photocatalytic oxidation [6–8] have been proposed in recent decades. Among the above methods, photocatalytic oxidation technology is a promising method for removing gaseous pollutants with a low concentration, owing to its excellent features of operation at room temperature and high * Gao‑Ke Zhang [email protected] 1
Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
activity towards various pollutants which can react to final products (CO2 and H2O) [9–11]. This technology is basically founded on the application of semiconductor materials with ultraviolet (UV) light at ambient temperature [12, 13]. For instance, TiO2 is regarded as the appropriate semiconductor photocatalyst for converting various VOCs into less harmful molecules due to its low cost, high stability and great capability [14]. D
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