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学科主题: Environmental Sciences & Ecology
题名: Effect of groundwater geochemistry on pentachlorophenol remediation by smectite-templated nanosized Pd-0/Fe-0
作者: Jia Hanzhong; Gu Cheng; Li Hui; Fan Xiaoyun; Li Shouzhu; Wang Chuanyi
通讯作者: Jia, HZ
关键词: Pentachlorophenol ; Palladized zero-valent iron ; Smectite ; Geochemistry ; pH ; Humic acid
刊名: ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
发表日期: 2012
DOI: 10.1007/s11356-012-0895-z
卷: 19, 期:8, 页:3498-3505
收录类别: SCI
资助者: National Natural Science Foundation of China 21173261; Chinese Academy of Sciences 1029471301, XBBS201112
摘要: Zero-valent iron holds great promise in treating groundwater, and its reactivity and efficacy depend on many surrounding factors. In the present work, the effects of solution chemistry such as pH, humic acid (HA), and inorganic ions on pentachlorophenol (PCP) dechlorination by smectite-templated Pd-0/Fe-0 were systematically studied. Smectite-templated Pd-0/Fe-0 was prepared by saturating the negatively charged sites of smectite clay with Fe(III) and a small amount of Pd(II), followed by borohydride reduction to convert Fe(III) and Pd(II) into zero-valent metal clusters. Batch experiments were conducted to investigate the effects of water chemistry on PCP remediation. The PCP dechlorination rate critically depends on the reaction pH over the range 6.0 similar to 10.0; the rate constant (k (obs)) increases with decreasing the reaction pH value. Also, the PCP remediation is inhibited by HA, which can be attributed to the electron competition of HA with H+. In addition, the reduction of PCP can be accelerated by various anions, following the order: Cl- > HCO (3) (-) > SO (4) (2-) similar to no anion. In the case of cations, Ca2+ and Mg2+ (10 mM) decrease the dechlorination rate to 0.7959 and 0.7798 from 1.315 h(-1), respectively. After introducing HA into the reaction systems with cations or/and anions, the dechlorination rates are similar to that containing HA alone. This study reveals that low pH and the presence of some anions such as Cl- facilitate the PCP dechlorination and induce the rapid consumption of nanosized zero-valent iron simultaneously. However, the dechlorination rate is no longer correlated to the inhibitory or accelerating effects by cations and anions in the presence of 10 mg/L HA.
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内容类型: 期刊论文
URI标识: http://ir.xjipc.cas.cn/handle/365002/1619
Appears in Collections:环境科学与技术研究室_期刊论文

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作者单位: Chinese Acad Sci, LEMST, Xinjiang Tech Inst Phys & Chem, Urumqi 830011, Xinjiang, Peoples R China;Michigan State Univ, Dept Crop & Soil Sci, E Lansing, MI 48823 USA

Recommended Citation:
Jia Hanzhong,Gu Cheng,Li Hui,et al. Effect of groundwater geochemistry on pentachlorophenol remediation by smectite-templated nanosized Pd-0/Fe-0[J]. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,2012,19(8):3498-3505.
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