Dependence of bisphenol A photodegradation on the initial concentration of oxalate in the lepidocrocite-oxalate complex system

文献类型： 外文期刊

第一作者： Dong Jun

作者： Dong Jun;Li Fang-bai;Lan Chong-yu;Liu Cheng-shuai;Li Xiao-min;Luan Tian-gang

作者机构：

关键词： bisphenol A;lepidocrocite;oxalate;photodegradation

期刊名称：JOURNAL OF ENVIRONMENTAL SCIENCES （ 影响因子：5.565； 五年影响因子：5.066 ）

ISSN： 1001-0742

年卷期： 2006 年 18 卷 4 期

页码：

收录情况： SCI

摘要： To understand the degradation of endocrine disrupting chemicals (EDCs) in natural environment with existence of iron oxides and carboxylic acids, the dependence of bisphenol A (BPA) photodegradation on the initial concentration of oxalate (C-OX) in lepidocrocite (gamma-FeOOH) aqueous suspension was investigated under both UV and visible lights in this study. Lepidocrocite powder was home-prepared by a hydrothermal process. It was found that BPA degradation was promoted greatly in the presence of oxalate owing to the formation of lepidocrocite-oxalate complex. And there was an optimal C-OX, which was 2.0 and 2.4 mmol/L, under U-V and visible lights, respectively. The first-order kinetic constant, k value increased 38 times from 0.17 X 10(-2) min(-1) in the absence of oxalate to 6.39 X 10(-2) min(-1) in the presence of oxalate with an optimal C-OX (2.0 mmol/L) under UV irradiation, and almost 306 times from 0.02 X 10(-2) min(-1) in the absence of oxalate to 6.11 X 10(-2) min(-1) in the presence of oxalate with an optimal C-OX (2.4 mmol/L) under visible irradiation. The BPA degradation rate increased and the first-order kinetic constants decreased with the increase in BPA initial concentration. The dependence of the variation of pH value, total-Fe and Fe2+ during the photoreaction on C-OX was also investigated. The pH value increased obviously with the reaction time. Total-Fe increased dramatically at the first 5 min and then decreased quickly under UV irradiation and slowly under visible irradiation. The initial concentration of oxalate is a main factor to affect BPA photodegradation in aqueous suspension under both UV and visible lights.

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