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首页> 外文期刊>Separation and Purification Technology >Carbon dioxide radical anion-based UV/S2O82-/HCOOH reductive process for carbon tetrachloride degradation in aqueous solution
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Carbon dioxide radical anion-based UV/S2O82-/HCOOH reductive process for carbon tetrachloride degradation in aqueous solution

机译：基于二氧化碳的基于基于的紫外线紫外线/ S2O82- / HCOOH还原过程，用于水溶液中的四氯化碳降解

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摘要

The reduction performance of carbon tetrachloride (CT) mediated by carbon dioxide radical anion (CO2 center dot-) was investigated in this study, and CO2 center dot- was generated by the reaction of formic acid and sulfate radical produced in the UV/S2O82- process. The effects of various factors including persulfate and formic acid concentrations, solution pH, and anions such as Cl--, HCO3-, NO3-, and SO42- were evaluated. The experimental results showed that CT could be almost completely removed in 60 min with 1.50 mM persulfate and 2.25 mM formic acid. CT degradation efficiency was found to increase with increasing persulfate (0.75-4.50 mM) and formic acid (0.75-2.25 mM) concentrations. In the pH adjusted solutions (from pH 6-8), maximum CT degradation occurred at pH 6. Both Cl- and NO3- (1-100 mM), as well as HCO3- at high concentrations (10 and 100 mM), adversely affected CT degradation performance. The addition of methyl viologen as CO2 center dot- scavengers proved the presence of CO2 center dot- in this UV/S2O82-/HCOOH process, and the dechlorination of CT was not complete as release rate was 80.6% after 240 min. (C) 2016 Elsevier B.V. All rights reserved.
机译：在本研究中研究了二氧化碳基团阴离子（CO2中心点）介导的四氯化碳（CT）的还原性能，并通过UV / S2O82中产生的甲酸和硫酸盐自由基的反应产生CO2中心点。过程。各种因子的影响，包括过硫酸盐和甲酸浓度，溶液pH和阴离子，如Cl-，HCO3-，NO 3-和SO42--。实验结果表明，在60分钟内几乎可以在1.50mm过硫酸盐和2.25mM甲酸中几乎完全除去CT。发现CT降解效率随着过硫酸盐（0.75-4.50mm）和甲酸（0.75-2.25mm）浓度而增加。在pH调节的溶液（从pH 6-8）中，在pH6中发生最大CT降解影响CT降解性能。作为CO2中心点清除剂的加入甲基Viologen在该UV / S2O82- / HCOOH工艺中证明了CO2中心点的存在，并且CT的脱氯在240分钟后释放速率为80.6％。 （c）2016年Elsevier B.v.保留所有权利。

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  • 作者

    Gu Xiaogang; Lu Shuguang; Fu Xiaori; Qiu Zhaofu; Sui Qian; Guo Xuhong;

  • 作者单位

    East China Univ Sci &

    Technol Shanghai Key Lab Funct Mat Chem State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Shanghai Key Lab Funct Mat Chem State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Shanghai Key Lab Funct Mat Chem State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Shanghai Key Lab Funct Mat Chem State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Shanghai Key Lab Funct Mat Chem State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol Shanghai Key Lab Funct Mat Chem State Environm Protect Key Lab Environm Risk Asse Shanghai 200237 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 分离过程;气化工艺;
  • 关键词

    Ultraviolet irradiation; Persulfate; Formic acid; Carbon dioxide radical anion; Carbon tetrachloride degradation;

    机译：紫外线辐射;过硫酸盐;甲酸;二氧化碳自由基阴离子;四氯化碳降解;

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