Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20721
Title: The photocatalyic degradation and modeling of 2,4-Dichlorophenoxyacetic acid by bismuth tungstate/peroxide
Authors: Pei, CC
Chu, W 
Keywords: 2,4-Dichlorophenoxyacetic acid
Bismuth tungstate
Hydrogen peroxide
Visible light
Issue Date: 2013
Publisher: Elsevier
Source: Chemical engineering journal, 2013, v. 223, p. 665-669 How to cite?
Journal: Chemical engineering journal 
Abstract: The photodegradation of herbicide 2,4-Dichlorophenoxyacetic acid (2,4-D) by bismuth tungstate with or without hydrogen peroxide by visible light was investigated. The photocatalytical reactions were studied under various conditions including the examination of the effects of initial pH, 2,4-D concentrations, light intensities, and hydrogen peroxide. Photocatalytic reactions were optimized at pH 5, higher or lower pH levels will reduce the decay rate due to the phase change of 2,4-D molecules and/or bismuth tungstate. The increase of catalyst/[2,4-D] ratio and light intensity were found to improve the 2,4-D decay rates, due to the increment of number of active sites and electron-holes on the Bi2WO6 surface, respectively. The involvement of H2O2 in the Bi2WO6 photocatalytic process can effectively double the 2,4-D decay rate, however, this was observed within a narrow gap of H2O2 dosages and easily overdosed, a precise control of H2O2 dosing is critical for a successful application. Kinetic models were derived successfully, so that the process performance is predictable by incorporating initial pH level, 2,4-D concentration, light intensities, and hydrogen peroxide.
URI: http://hdl.handle.net/10397/20721
ISSN: 1385-8947
DOI: 10.1016/j.cej.2013.02.125
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