Batch reactor kinetic studies on the reductive dechlorination of chlorinated ethylenes by tetrakis-(4-sulfonatophenyl)porphyrin cobalt

被引：7

作者：

Barnett, Brandon R. ^{[1
]}

Evans, Alexandra L. ^{[1
]}

Roberts, Courtney C. ^{[1
]}

Fritsch, Joseph M. ^{[1
]}

机构：

[1] Pepperdine Univ, Dept Chem, Div Nat Sci, Malibu, CA 90263 USA

来源：

CHEMOSPHERE | 2011年 / 82卷 / 04期

关键词：

Chlorinated ethylenes; Reductive dechlorination; Cobalt porphyrin; Kinetic studies; UNITED-STATES; CARBON-TETRACHLORIDE; MEDIATED REDUCTION; VITAMIN B12S; TETRACHLOROETHYLENE; TRICHLOROETHYLENE; 1,1,1-TRICHLOROETHANE; DEHALOGENATION; HISTORY; METALS;

D O I：

10.1016/j.chemosphere.2010.11.015

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Tetrakis-(4-sulfonatophenyl)porphyrin cobalt was identified as a highly-active reductive dechlorination catalyst for chlorinated ethylenes. Through batch reactor kinetic studies, degradation of chlorinated ethylenes proceeded in a step-wise fashion with the sequential replacement of Cl by H. For perchloroethylene (PCE) and trichloroethylene (TCE), the dechlorination products were quantified and the C-2 mass was accounted for. Degradation of the chlorinated ethylenes was found to be first-order in substrate. Dechlorination trials with increasing catalyst concentration showed a linearly increasing pseudo first-order rate constant which yielded rate laws for PCE and TCE degradation that are first-order in catalyst. The dechlorination activity of this catalyst was compared to that of another water-soluble cobalt porphyrin under the same reaction conditions and found to be comparable for PCE and TCE. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：592 / 596

页数：5

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