标题：Rapid Photooxidation of As(III) through Surface Complexation with Nascent Colloidal Ferric Hydroxide作者：Xu, Jing; Li, Jinjun; Wu, Feng; Zhang, You

来源出版物：ENVIRONMENTAL SCIENCE & TECHNOLOGY 卷：48 期：1 页：272-278 DOI：10.1021/es403667b 出版年：JAN 7 2014

摘要：Contamination of water and soils with arsenic, especially inorganic arsenic, has been one of the most important topics in the fields of environmental science and technology. The interactions between iron and arsenic play a very significant role in the environmental behavior and effect of arsenic species. However, the mechanism of As(III) oxidation in the presence of iron has remained unclear because of the complicated speciation of iron and arsenic. Photooxidation of As(III) on nascent colloidal ferric hydroxide (CFH) in aqueous solutions at pH 6 was studied to reveal the transformation mechanism of arsenic species. Experiments were done by irradiation using light-emitting diodes with a central wavelength of 394 nm. Results show that photooxidation of As(III) and photoreduction of Fe(III) occurred simultaneously under oxic or anoxic conditions. Photooxidation of As(III) in the presence of nascent CFH occurred through electron transfer from As(III) to Fe(III) induced by absorption of radiation into a ligand-to-metal charge-transfer (LMCT) band. The estimated quantum yield of photooxidation of As(III) at 394 nm was (1.023 +/- 0.065) x 10(-2). Sunlight-induced photooxidation of As(III) also occurred, implying that photolysis of the CFH-As-III surface complex could be an important process in environments wherein nascent CFH exists.

入藏号：WOS:000329548800039

文献类型：Article

语种：English

扩展关键词：INDUCED OXIDATION; ARSENIC REMOVAL; HYDROGEN-PEROXIDE; AQUEOUS-SOLUTIONS; RATE CONSTANTS; IRON; IRON(III); GOETHITE; RADICALS; LIGAND

通讯作者地址：Li, Jinjun; Wuhan Univ, Dept Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bi, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

电子邮件地址：ljj0410@163.com; fengwu@whu.edu.cn

地址：

[Xu, Jing; Li, Jinjun; Wu, Feng; Zhang, You] Wuhan Univ, Dept Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bi, Sch Resources & Environm Sci, Wuhan 430079, Peoples R China.

研究方向：Engineering; Environmental Sciences & Ecology

ISSN：0013-936X