文献类型：期刊文献

英文题名：Enhanced reduction of chlorophenols by nanoscale zerovalent iron supported on organobentonite

作者：Li, Yimin[1];Zhang, Yun[1,2,3];Li, Jianfa[1];Sheng, Guodong[1];Zheng, Xuming[2,3]

机构：[1]Shaoxing Univ, Coll Chem & Chem Engn, Shaoxing 312000, Zhejiang, Peoples R China;[2]Zhejiang Sci Tech Univ, Dept Chem, Hangzhou 310018, Zhejiang, Peoples R China;[3]Zhejiang Sci Tech Univ, State Key Lab ATMMT MOE, Hangzhou 310018, Zhejiang, Peoples R China

年份：2013

卷号：92

期号：4

起止页码：368

外文期刊名：CHEMOSPHERE

收录：SCI-EXPANDED(收录号：WOS:000320212100005)、、EI(收录号：20132216377424)、Scopus(收录号：2-s2.0-84878115418)、WOS

基金：This work was supported by the National Natural Science Foundation of China (20977063, 21177088).

语种：英文

外文关键词：Organobentonite; Nanoscale zerovalent iron; Chlorophenols; Reduction; Synergetic effect

外文摘要：The reactivity of nanoscale zerovalent iron (NZVI) on removing chlorophenols (2-chlorophenol, 2,4-dichlorophenol, 2,4,6-trichlorophenol and pentachlorophenol) was remarkably enhanced by using a hydrophobic support of organobentonite (CTMA-Bent), namely the bentonite modified with organic cetyltrimethylammonium (CTMA) cations. The complete dechlorination of chlorophenols and total conversion into phenol using this novel NZVI/CTMA-Bent combination was observed in batch experiments. The kinetic studies suggested that the reduction of chlorophenols by NZVI was accelerated due to the enhanced adsorption onto CTMA-Bent, which facilitated the mass transfer of chlorophenols from aqueous to iron surface. The enhanced reduction rate by NZVI/CTMA-Bent was positively related to the hydrophobicity of chlorophenols, and an increasing linear relationship was obtained between the relative enhancement on reaction rate constants (k(2)/k(1)) and logK(ow) values of chlorophenols. XPS results suggested there were fewer precipitates of ferric (hydro)xides formed on the surface of NZVI/CTMA-Bent, which may also lead to the improved reactivity and repetitive usability of NZVI/CTMA-Bent on removing chlorophenols. (c) 2013 Elsevier Ltd. All rights reserved.