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Title: Photoelectrocatalytic degradation of humic acid in aqueous solution using a Ti/TiO?mesh photoelectrode
Authors: Li, XZ
Li, FB
Fan, CM
Sun, YP
Issue Date: May-2002
Source: Water research, May 2002, v. 36, no. 9, p. 2215-2224
Abstract: Humic acid (HA) is one of natural organics existing in water supply as a precursor of trihalomethanes formation in chlorination. The photo-degradation of HA in aqueous solution by photoelectrocatalytic (PEC) oxidation using a Ti/TiO?mesh electrode was investigated in terms of UV absorbance at 254 nm, colour and TOC concentration. The key factors affecting the PEC oxidation efficiency were studied, including the concentration of electrolyte, electrical bias applied, pH value of HA solution, the intensity of incident light and the area of Ti/TiO?mesh photoelectrodes. The first-order kinetic model was applied to describe the PEC oxidation, in which the kinetic constant k was verified by the experimental data as a function of the concentration of electrolyte, light intensity, the area of Ti/TiO?mesh electrode and the voltage of electrical bias applied. It was found that there was an optimal bias voltage of 1.63V and low pH value was favourable for TOC removal in HA solution. Our investigation showed that PEC oxidation was a convenient way to mineralise the organic matters with high efficiency.
Keywords: Humic acid
Photoelectrocatalytic degradation
Ti/TiO?mesh
First-order kinetic constant
Sodium peroxodisulphate
Publisher: IWA Publishing
Journal: Water research 
ISSN: 0043-1354
EISSN: 1879-2448
DOI: 10.1016/S0043-1354(01)00440-7
Rights: Water Research ? 2002 Elsevier Science Ltd. The journal web site is located at http://www.sciencedirect.com.
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