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Effect of groundwater geochemistry on pentachlorophenol remediation by smectite-templated nanosized Pd-0/Fe-0
Jia Hanzhong; Gu Cheng; Li Hui; Fan Xiaoyun; Li Shouzhu; Wang Chuanyi; Jia, HZ
2012
Source PublicationENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN0944-1344
Volume19Issue:8Pages:3498-3505
AbstractZero-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.
KeywordPentachlorophenol Palladized Zero-valent Iron Smectite Geochemistry Ph Humic Acid
Subject AreaEnvironmental Sciences & Ecology
DOI10.1007/s11356-012-0895-z
Indexed BySCI
WOS IDWOS:000307403000046
Citation statistics
Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xjipc.cas.cn/handle/365002/1619
Collection环境科学与技术研究室
Corresponding AuthorJia, HZ
AffiliationChinese 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
GB/T 7714
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.
APA Jia Hanzhong.,Gu Cheng.,Li Hui.,Fan Xiaoyun.,Li Shouzhu.,...&Jia, HZ.(2012).Effect of groundwater geochemistry on pentachlorophenol remediation by smectite-templated nanosized Pd-0/Fe-0.ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH,19(8),3498-3505.
MLA Jia Hanzhong,et al."Effect of groundwater geochemistry on pentachlorophenol remediation by smectite-templated nanosized Pd-0/Fe-0".ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 19.8(2012):3498-3505.
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