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Effect of pH on pentachlorophenol degradation in irradiated iron/oxalate systems

文献类型： 外文期刊

作者： Lan, Qing 1 ; Liu, Hong 2 ; Li, Fang-bai 1 ; Zeng, Feng 2 ; Liu, Cheng-shuai 1 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

2.Sun Yat Sen Univ, Sch Chem & Chem Engn, Guangzhou 510275, Guangdong, Peoples R China

关键词： Pentachlorophenol;Oxalic acid;Hematite;Goethite;pH

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.273； 五年影响因子：11.529 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： This study investigated the photodegradation of pentachlorophenol (PCP) in two types of iron oxide/oxalate systems as a function of pH. Two iron oxides of hematite (α-Fe_2O_3) and goethite (α-FeOOH) were selected. The experiments conducted at pH values 3.5, 5.0, and 7.0 showed that PCP photodegradation proceeded rapidly at 3.5, and slowed down with the increase in pH. To account for the effect of pH on the degradation kinetics, the surface charge of iron oxides, the adsorption of PCP and oxalic acid onto the iron oxides at different pH values were researched. The presence of oxalic acid gave the iron oxides a negative charge at pH values above 3, which caused the decrease of PCP adsorption with increasing pH value. A higher PCP adsorption in low pH may contribute to PCP photodegradation. On the other hand, iron oxides adsorbed oxalic acid to form photoactive Fe(III)-oxalate complexes. Compared with α-FeOOH, α-Fe_2O_3 had a much stronger ability to adsorb oxalic acid and showed better photocatalytic activity. Furthermore, the detection results of H_2O_2 during the process of photodegradation showed that a low pH favored the H_2O_2 generation. The combination of oxalic acid photodegradation and intermediates during the process of PCP photodegradation indicated that at an initial pH of 3.5, the PCP photodegradation occurred mainly via the attack by ~·OH, and that at initial pH values 5.0 and 7.0, a direct photolysis mechanism was dominant.

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