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Photocatalytic degradation of methylene blue by ZnGa2O4 thin films

Paper ID Volume ID Publish Year Pages File Format Full-Text
51420 46842 2009 5 PDF Available
Title
Photocatalytic degradation of methylene blue by ZnGa2O4 thin films
Abstract

ZnGa2O4 thin films were synthesized using a sol–gel process, characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and UV–vis spectrophotometry measurements. The photocatalytic decomposing properties to methylene blue (MB) dye were studied for the first time. Effects of calcining temperature, grain size and film thickness on the photocatalytic activity were investigated. The film obtained at calcining temperature of 700 °C, consisting of the smallest crystallites, exhibits highest photocatalytic activity. With increasing the film thickness, the photocatalysis rate constant increased first to 0.0195, and then decreased drastically to 0.0089 due to the competition between UV absorption and carriers diffusion. The photocatalytic activity of ZnGa2O4 films maintained more than 90% of the initial value after 6 cycles, compared favorably with the 70% of ZnGa2O4 powder.

Keywords
Sol–gel process; ZnGa2O4 thin film; Methylene blue degradation; Photocatalysis
First Page Preview
Photocatalytic degradation of methylene blue by ZnGa2O4 thin films
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 10, Issue 13, 25 July 2009, Pages 1781–1785
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis