alexa Enhancement of photocatalytic activity by semiconductor heterojunctions: a-Fe2O3, WO3 and CdS deposited on ZnO.
Materials Science

Materials Science

Research & Reviews: Journal of Material Sciences

Author(s): S Sakthivel, SU Geissen, DW Bahnemann, V Murugesan, A Vogelpohl

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Fe2O3, WO3 and CdS deposited on ZnO have been prepared and their photocatalytic activity was determined by photooxidation of dichloro acetic acid (DCA) in aqueous solution illuminated under medium pressure mercury lamp. These particulates were examined spectroscopically and by surface analytical methods such as surface area, X-ray diffraction (XRD) and scanning electron microscopy (SEM). The effects of the -Fe2O3, WO3 and CdS contents on the photocatalytic activities were studied. The experiments were carried out under three different conditions: (1) under continuous purging with molecular oxygen, (2) in the presence of naturally dissolved oxygen and (3) in the absence of oxygen. The results reveal that the mixtures of ZnO with -Fe2O3 (0.5 wt.%), WO3 (0.02 wt.%) and CdS (0.2 wt.%) exhibit higher photocatalytic activity than pure ZnO.

This article was published in J PhotoChemPhotobiolA and referenced in Research & Reviews: Journal of Material Sciences

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