Enhanced reduction of chlorophenols by nanoscale zerovalent iron supported on organobentonite

被引：54
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
来源：
CHEMOSPHERE | 2013年 / 92卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Organobentonite; Nanoscale zerovalent iron; Chlorophenols; Reduction; Synergetic effect; ZERO-VALENT IRON; FE/NI PARTICLES; DEGRADATION; DECHLORINATION; REMOVAL; SORPTION; WATER; TRICHLOROETHYLENE; PENTACHLOROPHENOL; NANOPARTICLES;
D O I：
10.1016/j.chemosphere.2013.01.030
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
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.
引用
收藏
页码：368 / 374
页数：7
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