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首页> 外文期刊>Environmental Science & Technology >Enhanced Dechlorination of Chlorinated Methanes and Ethenes by Chloride Green Rust in the Presence of Copper(II)
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Enhanced Dechlorination of Chlorinated Methanes and Ethenes by Chloride Green Rust in the Presence of Copper(II)

机译：铜存在下氯化物绿锈增强氯化甲烷和乙烯的脱氯作用

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摘要

The enhanced removal of carbon tetrachloride (CCl_4),tetrachloroethene (C_2Cl_4),and trichloroethene (C_2HCl_3) by chloride green rust (GR(Cl) in the presence of copper ions was investigated.X-ray powder diffraction (XRPD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the crystallization and chemical speciation,respectively,of the secondary mineral phases produced in the GR(CI)-Cu(II) system.The addition of Cu(II) to GR(CI) suspensions resulted in enhanced dechlorination of the chlorinated hydrocarbons examined in this study.The degradation reactions followed pseudo-first-order kinetics and the pseudo-first-order rate constant (kappa_(obs)) for CCl_4 (20muM) removal by GR(CI) at pH 7.2 was 0.0808 h~(-1).Addition of 0.5 mM Cu(II) completely dechlorinated CCl_4 within 35 min,and the kappa_(obs) was 84 times greater than that in the absence of Cu(II).Chloroform (CHCI_3),the major chlorinated product in CCl_4 dechlorination,accumulated at a concentration up to 13muM in the GR(CI) system alone,but was completely dechlorinated within 9 h in the GR(Cl)-Cu(II) suspension.Also,rapid removal of C_2Cl_4 and C_2HCl_3 by GR(CI) was observed when Cu(II) was added.The kappa_(obs) values for the removal of chlorinated ethenes were 4.7-7 times higher than that obtained in the absence of Cu(II).In addition,the kappa_(obs) for PCE removal increased linearly with respect to Cu(II) concentrations in the range from 0.1 to 1.0 mM.Addition of Cu(II) at a concentration higher than 1.0 mM decreased the kappa_(obs) for the removal of both C_2CI_4 and C_2HCI_3 due to the decrease in structural Fe(II) concentration in GR(CI) and the changes in redox potentials and pH values.Moreover,the highest removal efficiency and rate of C_2Cl_4was obtained at near-neutral pH when Cu(II) was added into the GR(CI) suspension.XPS and XRPD results showed that the Fe(II) in the GR(CI) suspension could reduce Cu(II) to both Cu(I) and metallic Cu.These findings are relevant to the better understanding of the role of abiotic removal of chlorinated hydrocarbons during remediation and/or natural attenuation in iron-reducing environments.
机译：研究了在铜离子存在下，氯绿锈（GR（Cl））增强了四氯化碳（CCl_4），四氯乙烯（C_2Cl_4）和三氯乙烯（C_2HCl_3）的去除。X射线粉末衍射（XRPD）和X射线用光电子能谱（XPS）表征了GR（CI）-Cu（II）系统中产生的次生矿物相的结晶和化学形态，结果表明将Cu（II）添加到GR（CI）悬浮液中在pH值下用GR（CI）去除CCl_4（20μM）时，降解反应遵循拟一级动力学和拟一级速率常数（kappa_（obs））。 7.2为0.0808 h〜（-1）。添加0.5 mM Cu（II）在35分钟内将CCl_4完全脱氯，并且kappa_（obs）是不存在Cu（II）时的84倍。氯仿（CHCI_3） ，CCl_4脱氯过程中的主要氯化产物，累积浓度高达13muM仅在GR（CI）系统中，但在GR（Cl）-Cu（II）悬浮液中在9 h内就完全脱氯了去除氯化乙烯的kappa_（obs）值是不存在Cu（II）时的4.7-7倍。此外，去除PCE的kappa_（obs）相对于Cu（II）呈线性增加II）浓度范围从0.1到1.0 mM。由于结构Fe（II）浓度降低，以高于1.0 mM的浓度添加Cu（II）降低了同时去除C_2CI_4和C_2HCI_3的kappa_（obs） GR（CI）悬浮液中加入Cu（II）后，在接近中性pH值时，C_2Cl_4的去除效率和去除率最高.XPS和XRPD结果结果表明，GR（CI）悬浮液中的Fe（II）可以将Cu（II）还原为Cu（I）和金属Cu。了解在铁还原环境中修复和/或自然衰减过程中非生物去除氯代烃的作用。

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  • 来源
    《Environmental Science & Technology》 |2005年第11期|p.4082-4090|共9页
  • 作者

    R.A.MAITHREEPALA; RUEY-AN DOONG;

  • 作者单位

    Department of Atomic Science,National Tsing Hua University,101,Sec.2,Kuang Fu Road,Hsinchu,30013,Taiwan;

    Department of Atomic Science,National Tsing Hua University,101,Sec.2,Kuang Fu Road,Hsinchu,30013,Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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