Remediation of hexavalent chromium contaminated soil by stabilized nanoscale zero-valent iron prepared from steel pickling waste liquor

被引:90
作者
Wang, Yu [1 ,2 ]
Fang, Zhanqiang [1 ,2 ]
Liang, Bin [1 ,2 ]
Tsang, Eric Pokeung [2 ,3 ]
机构
[1] S China Normal Univ, Sch Chem & Environm, Guangzhou 510006, Guangdong, Peoples R China
[2] Guangdong Technol Res Ctr Ecol Management & Remed, Guangzhou 510006, Guangdong, Peoples R China
[3] Hong Kong Inst Educ, Dept Sci & Environm Studies, Hong Kong 00852, Hong Kong, Peoples R China
关键词
Nanoscale zero-valent iron (nZVI); Chromium contamination; Soil; Remediation; Mechanism; ORE PROCESSING RESIDUE; POLYBROMINATED DIPHENYL ETHERS; CALCIUM POLYSULFIDE; ZEROVALENT IRON; PARTICLE-SIZE; REDUCTION; IMMOBILIZATION; NANOPARTICLES; WATER; CHINA;
D O I
10.1016/j.cej.2014.03.011
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The removal of Cr(VI) from contaminated soil using sodium carboxymethyl cellulose (CMC)-stabilized nanoscale zero-valent iron prepared from steel pickling waste liquor was systematically investigated. Laboratory batch experiments indicated that 0.09 g L-1 of Fe-o nanoparticles at a soil to solution ratio of 1 g: 10 mL completely reduced the aqueous-bound Cr(VI), which contributed about 46% of the pre-sorbed Cr(VI) in the soil (Cr(VI) = 102 mg kg(-1)). Furthermore, the addition of Fe-o nanoparticles only removed a portion of the soil-bound Cr(VI). When the soil was treated with 0.3 g L-1 of Fe nanoparticles for 72 h, 80% of the loaded Cr(VI) was reduced to Cr(III), which resulted in a residual Cr(VI) concentration of 20 mg kg(-1). Based on the studies of elemental distributions and XPS analysis, it is proposed that reduction and immobilization may be equally important removal mechanisms for Cr(VI) by CMC-nZVI. Following the treatment by CMC-nZVI, the TCLP leachability of the Cr(VI) and Cr-total was significantly reduced by 100% and 82%, respectively. This study sheds new light on the remediation of Cr(VI)-contaminated soil by CMC-nZVI. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:283 / 290
页数:8
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