标题：Oxidation of organic contaminant in a self-driven electro/natural maghemite/peroxydisulfate system: Efficiency and mechanism

作者：Yan, SD (Yan, Suding); Xiong, WH (Xiong, Weihui); Xing, SY (Xing, Shuya); Shao, YQ (Shao, Yueqi); Guo, R (Guo, Rui); Zhang, H (Zhang, Hui)

来源出版物：SCIENCE OF THE TOTAL ENVIRONMENT 卷：599页码：1181-1190 DOI：10.1016/j.scitotenv.2017.05.037 出版年：DEC 1 2017

摘要：Electro-assisted iron-mediated persulfate (PS) activation process has been successfully employed to oxidize organic contaminant. However, a majority of iron-based catalysts used for PS activation was synthesized through complicated or demanding procedures and may have potential risks on environment during the preparation process. Herein, natural maghemite (NM) which is abundant on the earth was employed to activate peroxydisulfate (PDS) in an electrolytic cell. The voltage was provided by microbial fuel cell (MFC) instead of external power as reported in the previous studies, so as to establish a self-driven electro/natural maghemite/PDS system (MFC/NM/PDS) for the oxidation of acid orange 7 (A07). The results showed that above 90% removal efficiency of A07 was achieved in a wide range of pH (3.0-9.0) after 100 min reaction. Singlet oxygen was identified for the first time during PDS activation and surface bound sulfate radicals served as the dominant active species responsible for A07 oxidation. The underlying mechanism of A07 elimination in the MFC/NM/PDS system was elucidated through quenching tests, electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) techniques. The variation of TOC and cytotoxicity to Escherichia coli was explored. The intermediate products formed were identified using LC-TOF-MS technique and a possible pathway of A07 degradation was proposed.

入藏号：WOS:000405253500015

文献类型：Article

语种：English

作者关键词： Natural maghemite; Peroxydisulfate activation; Microbial fuel cell; Sulfate radical; Singlet oxygen

扩展关键词： SITU CHEMICAL OXIDATION; WASTE-WATER TREATMENT; MICROBIAL FUEL-CELLS; ZERO-VALENT IRON; ACID ORANGE 7; ACTIVATED PERSULFATE; AQUEOUS-SOLUTION; HETEROGENEOUS ACTIVATION; SULFATE RADICALS; DEGRADATION

通讯作者地址：Zhang, H (通讯作者),Wuhan Univ, Dept Environm Engn, POB C319,Luoyu Rd 129, Wuhan 430079, Peoples R China.

电子邮件地址：eeng@whu.edu.cn

地址：

[Yan, Suding; Xiong, Weihui; Xing, Shuya; Shao, Yueqi; Guo, Rui; Zhang, Hui] Wuhan Univ, Hubei Biomass Resource Chem & Environm Biotechnol, Dept Environm Engn, Wuhan 430079, Peoples R China.

[Yan, Suding] Hubei Normal Univ, Coll Urban & Environm Sci, Huangshi 435002, Peoples R China.

[Zhang, Hui] Wuhan Univ, Shenzhen Res Inst, Shenzhen 518057, Peoples R China.

研究方向：Environmental Sciences & Ecology

ISSN：0048-9697

eISSN: 1879-1026

影响因子：4.9