Heterogeneous photodegradation of pentachlorophenol and iron cycling with goethite, hematite and oxalate under UVA illumination
文献类型： 外文期刊
作者： Lan, Qing 1 ; Li, Fang-bai 1 ; Sun, Cui-xiang 1 ; Liu, Cheng-shuai 1 ; Li, Xiang-zhong 3 ;
作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China
2.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
3.Hong Kong Polytech Univ, Dept Civil & Struct Engn, Hong Kong, Hong Kong, Peoples R China
4.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
关键词： heterogeneous photodegradation;pentachlorophenol;iron cycle;goethite;hematite;oxalate
期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）
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收录情况： SCI
摘要： Heterogeneous photodegradation of pentachlorophenol (PCP) in the goethite (α-FeOOH) and hematite (α-Fe_2O_3) systems with oxalate under UVA illumination was investigated. The PCP degradation, dechlo-rination and detoxification, in terms of Microtox acute toxicity, were all achieved to the higher efficiency in the hematite suspension than in the goethite suspension. The optimal initial concentration of oxalic acid (C_(ox)~0) for the PCP degradation with goethite and hematite under the experimental conditions was found to be 1.2 mM, since sufficient Fe(III) as Fe(C_2O_4)_3~(3-) and Fe(II) as Fe(C_2O_4)_2~(2-) can be formed at C_(ox)~0 ≥ 1.2 mM. The main intermediates of PCP degradation were identified by GC-MS, HPLC and IC analyses. It was found that the cycling process between Fe(III) and Fe(II) in both the goethite and hematite systems occurred more vigorously at the initial stage and gradually became gentle, while the rate of PCP photodegradation varied from fast to slow during the reaction time. Furthermore, the formation of H_2O_2 during photoreaction was studied to explore its relationship with the photodegradation efficiency and the iron cycling process.
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