太阳成8722(中国)有限公司-GREEN NO.1

标题：Natural montmorillonite induced photooxidation of As(III) in aqueous suspensions: Roles and sources of hydroxyl and hydroperoxyl/superoxide radicals作者：Wang, Yajie; Xu, Jing; Li, Jinjun; Wu, Feng

来源出版物：JOURNAL OF HAZARDOUS MATERIALS 卷：260 页：255-262 DOI：10.1016/j.jhazmat.2013.05.028 出版年：SEP 15 2013

摘要： Photooxidation of arsenite(As(III)) in a suspension of natural montmorillonite under the irradiation of metal halide lamp (lambda >= 313 nm)has been investigated. The results showed that the natural montmorillonite induced the photooxidation of As(III) by generating hydroxyl radicals (HO center dot) and hydroperoxyl/superoxide radicals (HO2 center dot/O-2(-center dot)). HO center dot which was responsible for the As(III) photooxidation. Approximately 38% of HO center dot was generated by the photolysis of ferric ions, and the formation of the remaining 62% was strongly dependent on the HO2 center dot/O-2(-center dot). The presence of free ironions (Fe2+ and Fe3+), made significant contributions to the photogeneration of these reactive oxygen species (ROS). The photooxidation of As(III) in natural montmorillonite suspensions was greatly influenced by the pH values. The photooxidation of As(III) by natural montmorillonite followed the Langmuir-Hinshelwood equation. In addition, the photooxidation of As(III) could be enhanced by the addition of humic acid. This work demonstrates that photooxidation may be an important environmental process for the oxidation of As(III) and may be a way to remove As(III) from acidic surface water containing iron-bearing clay minerals.

入藏号：WOS:000324563500032

文献类型：Article

语种：English

作者关键词：Photooxidation, Arsenite, Natural montmorillonite, Hydroxyl radical, Hydroperoxyl/superoxide radical, Iron species

扩展关键词：CLAY-MINERALS; METAL-OXIDES; HUMIC SUBSTANCES; ORGANIC-MATTER; OXIDATION; ARSENATE; PHOTODEGRADATION; ARSENIC(III); ADSORPTION; REACTIVITY

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

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

地址：

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

[Wang, Yajie] Guizhou Minzu Univ, Sch Chem & Environm Sci, Guiyang 550025, Peoples R China.

研究方向：Engineering; Environmental Sciences & Ecology

ISSN：0304-3894