期刊
CHEMICAL ENGINEERING JOURNAL
卷 203, 期 -, 页码 95-100出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.07.002
关键词
Catalytic degradation; Copper nanoparticles; Dichloromethane; Groundwater remediation; Pd/Fe bimetal; Zero-valent iron
资金
- National Science Council of Taiwan [NSC 98-2221-E-002-040-MY3]
Dichloromethane (DCM) is a recalcitrant groundwater contaminant that shows nearly no reactivity with zero-valent iron (ZVI) nanoparticles. In this study, an effective dechlorination of DCM has been demonstrated using zero-valent copper (Cu-0) nanoparticles as a catalyst under sodium borohydride reduction conditions. The average diameter of Cu-0 nanoparticles was about 50 nm and the specific surface area was about 19 m(2) g(-1). Batch experiments revealed that 90% of DCM (26.4 mg L-1) was rapidly degraded within 1 h in the presence of Cu-0 nanoparticles (2.5 g L-1) and sodium borohydride (1 g L-1). The observed pseudo-first-order rate constant (k(obs)) was 2.19 h(-1), corresponding to a surface area normalized rate constant of 0.052 L m(-2) h(-1), which is 2-3 orders of magnitude higher than for other zero-valent metals. The DCM degradation rate is a function of the Cu-0 nanoparticle dose. Increasing the dose increased the observed reaction rate. Product analysis indicated that the degradation of DCM involved hydrodechlorination. Soluble copper ions generated by the dissolution of Cu-0 nanoparticles are lower than the World Health Organization drinking water standard, which suggests that the use of Cu-0 nanoparticles under reduction conditions may be potentially useful for the treatment of recalcitrant contaminants that are unable to be degraded by ZVI technology. (C) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据