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Apr 6, 2020

ACS Spring 2020 National Meeting & Expo

Photocatalytic degradation of hazardous wastes using tungsten trioxide based hybrids

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Abstract

Organic compounds, such as: 4-chlorophenol and rhodamine B are products from industrial production mostly found in wastewater and are toxic. A cheap and environmentally effective method of removal of these compounds from wastewater is necessary. Photocatalysis is a productive and green method to degrade toxic organic compounds. The process consists of the creation of highly reactive oxygen species (superoxide radical anion and hydroxyl radical) by means of electrons and holes generated in a semiconductor under illumination. These species aid in the decomposition of organic compounds. The focus of this research was to develop an efficient system involving tungsten trioxide (WO3) semiconductor to use as a photocatalyst for the degradation of 4-chlorophenol and rhodamine B. Electrochemical deposition of WO3 was used as the main synthesis method in this research project. To optimize the photocatalytic system, the WO3 was combined with TiO2 and CdS to improve electron-hole separation and hinder the recombination of the charge carriers. The best photocatalytic activity was obtained by the sample of WO3 electrochemically deposited onto TiO2-seeded FTO glass. The FTO/TiO2/WO3 hybrid system had a bandgap of 3.03 eV and under illumination, efficiently decomposed 4-chlorophenol and rhodamine B in solution over time which was evident by the decrease of absorbance maximum in UV-Vis spectra. The sample was simple to prepare, reproducible, and its activity was preserved in the sequential photocatalytic runs.<br/>

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© Copyright 2019 Morressier GmbH.
All rights reserved.