Dechlorination of chlorinated phenols by subnanoscale Pd-0/Fe-0 intercalated in smectite: pathway, reactivity, and selectivity
Jia, HZ (Jia, Hanzhong); Wang, CY (Wang, Chuanyi)
2015
发表期刊JOURNAL OF HAZARDOUS MATERIALS
卷号300期号:12页码:779-787
摘要

Smectite clay was employed as templated matrix to prepare subnanoscale Pd-0/Fe-0 particles, and their components as well as intercalated architectures were well characterized by X-ray energy dispersive spectroscopy (X-EDS) and X-ray diffraction (XRD). Furthermore, as-prepared Pd-0/Fe-0 subnanoscale nanoparticles were evaluated for their dechlorination effect using chlorinated phenols as model molecules. As a result, pentachlorophenol (PCP) is selectively transformed to phenol in a stepwise dechlorination pathway within 6 h, and the dechlorination rate constants show linearly relationship with contents of Pd as its loadings <0.065%. Comparing with PCP, other chlorinated phenols display similar degradation pattern but within much shorter time frame. The dechlorination rate of chlorinated phenols increases with decreasing in number of -Cl attached to aromatic ring, which can be predicted by the total charge of the aromatic ring, exhibiting an inversely linear relationship with the dechlorination rates. While the selectivity of dechlorination depends on the charges associated with the individual aromatic carbon. Chloro-functional groups at the ortho-position are easier to be dechlorinated than that at meta- and para- positions yielding primarily 3,4,5-TCP as intermediate from PCP, further to phenol. The effective dechlorination warrants their potential utilizations in development of in-situ remediation technologies for organic pollutants in contaminated water.

关键词Smectite Subnanoscale Pd-0/fe-0 Chlorinated Phenols Remediation
DOI10.1016/j.jhazmat.2015.08.017
收录类别SCI
WOS记录号WOS:000366223700089
引用统计
文献类型期刊论文
条目标识符http://ir.xjipc.cas.cn/handle/365002/5126
专题中国科学院特殊环境功能材料与器件重点试验室
作者单位Chinese Acad Sci, Xinjiang Tech Inst Phys & Chem, Key Lab Funct Mat & Devices Special Environm, Lab Environm Sci & Technol, Urumqi 830011, Xinjiang, Peoples R China
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Jia, HZ ,Wang, CY . Dechlorination of chlorinated phenols by subnanoscale Pd-0/Fe-0 intercalated in smectite: pathway, reactivity, and selectivity[J]. JOURNAL OF HAZARDOUS MATERIALS,2015,300(12):779-787.
APA Jia, HZ ,&Wang, CY .(2015).Dechlorination of chlorinated phenols by subnanoscale Pd-0/Fe-0 intercalated in smectite: pathway, reactivity, and selectivity.JOURNAL OF HAZARDOUS MATERIALS,300(12),779-787.
MLA Jia, HZ ,et al."Dechlorination of chlorinated phenols by subnanoscale Pd-0/Fe-0 intercalated in smectite: pathway, reactivity, and selectivity".JOURNAL OF HAZARDOUS MATERIALS 300.12(2015):779-787.
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