Carbon-coated montmorillonite nanocomposite for the removal of chromium(VI) from aqueous solutions

被引:80
|
作者
Wei, Jing [1 ]
Tu, Chen [1 ]
Yuan, Guodong [2 ]
Bi, Dongxue [1 ]
Xiao, Liang [1 ]
Theng, Benny K. G. [3 ]
Wang, Hailong [4 ,5 ]
Ok, Yong Sik [6 ,7 ]
机构
[1] Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China
[2] Zhaoqing Univ, Sch Environm & Chem Engn, Zhaoqing 526061, Peoples R China
[3] Manaaki Whenua Landcare Res, Private Bag 11052, Palmerston North 4442, New Zealand
[4] Foshan Univ, Sch Environm & Chem Engn, Foshan 528000, Peoples R China
[5] Zhejiang A&F Univ, Sch Environm & Resource Sci, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Zhejiang, Peoples R China
[6] Korea Univ, Korea Biochar Res Ctr, Seoul 02841, South Korea
[7] Korea Univ, Div Environm Sci & Ecol Engn, Seoul 02841, South Korea
基金
中国国家自然科学基金;
关键词
Carbon-coated montmorillonite; Chromium(VI); Adsorption; STXM; XANES; HYDROTHERMAL CARBONIZATION PROCESS; HEXAVALENT CHROMIUM; ORGANIC-MOLECULES; HEAVY-METALS; CR(VI); ADSORPTION; ABSORPTION; REDUCTION; SOIL; IMMOBILIZATION;
D O I
10.1016/j.jhazmat.2019.01.080
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A carbon-coated montmorillonite nanocomposite (CMt), obtained by hydrothermal carbonization of montmorillonite suspension in glucose, was used to remove Cr(VI) from aqueous solutions. The distribution and speciation of Cr immobilized by CMt were assessed by transmission electron microscopy with energy-dispersive Xray analysis, X-ray absorption near edge structure (XANES), and scanning transmission soft X-ray microscopy (STXM). The variation in the functional groups and molecular structures of CMt was also investigated. The capacity of CMt for adsorbing Cr(VI) was markedly superior to that of the parent montmorillonite, showing maximum uptake of 100 and 12.4 mg g(-1) at pH 2 and 8, respectively. The Cr K-edge XANES and STXM analyses indicated that Cr(VI) was reduced to Cr(III) under both acidic and alkaline conditions, while a Cr(OH)3 precipitate and Cr(III)-acetate complex were the predominant species present on the CMt surface. The Fourier transform infrared spectroscopy and C K-edge XANES further suggested that the phenolic groups in CMt could serve as electron donors, facilitating Cr(VI) reduction. The combined results indicate that electrostatic attraction, Cr(VI) reduction, complexation, and precipitation are involved in the removal of Cr(VI) by CMt.
引用
收藏
页码:541 / 549
页数:9
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