零价铁与两亲性分子对四氯乙烯的吸附与还原作用

Sorption and reduction of tetrachloroethylene with zero valent iron and amphiphilic molecules.

作者信息

Cho Hyun-Hee, Park Jae-Woo

机构信息

Department of Geography and Environmental Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.

出版信息

Chemosphere. 2006 Aug;64(6):1047-52. doi: 10.1016/j.chemosphere.2005.12.062. Epub 2006 Feb 17.

DOI:10.1016/j.chemosphere.2005.12.062

PMID:16483631

Abstract

Effects of surfactants and natural organic matter (NOM) on the sorption and reduction of tetrachloroethylene (PCE) with zero valent iron (ZVI) were examined in this study. PCE reduction by ZVI depended on the ionic type of the surfactants. The removal of PCE and production of TCE with non-ionic Triton X-100 and cationic hexadecyltrimethyl-ammonium (HDTMA) at one-half and two times the critical micelle concentration (CMC) were 1.2-1.8 times higher than without surfactants because of the enhanced PCE partitioning and surface concentration by the sorbed surfactants. When anionic sodium dodecyl benzene sulfonate (SDDBS) at one-half and two times CMC and NOM at 20 mg l(-1) and 50 mg l(-1) concentrations were used, the removal of PCE doubled and TCE production decreased. In the presence of SDDBS, TCE production by ZVI was lower than with HDTMA and Triton X-100 while PCE removal was higher than with the other surfactants.

摘要

本研究考察了表面活性剂和天然有机物（NOM）对零价铁（ZVI）吸附和还原四氯乙烯（PCE）的影响。ZVI对PCE的还原取决于表面活性剂的离子类型。在临界胶束浓度（CMC）的一半和两倍浓度下，非离子型曲拉通X-100和阳离子型十六烷基三甲基铵（HDTMA）对PCE的去除和三氯乙烯（TCE）的生成比不使用表面活性剂时高1.2至1.8倍，这是因为吸附的表面活性剂增强了PCE的分配和表面浓度。当使用CMC一半和两倍浓度的阴离子型十二烷基苯磺酸钠（SDDBS）以及浓度为20 mg l(-1)和50 mg l(-1)的NOM时，PCE的去除量翻倍且TCE生成量减少。在SDDBS存在的情况下，ZVI生成TCE的量低于HDTMA和曲拉通X-100，而PCE的去除量高于其他表面活性剂。