Degradation of carbon tetrachloride in thermally activated persulfate system in the presence of formic acid

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• 作者：Minhui Xu ; Xiaogang Gu ; Shuguang Lu…
• 关键词：persulfate ; carbon tetrachloride ; thermal activation ; formic acid ; carbon dioxide radical anion
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：10
• 期：3
• 页码：438-446
• 全文大小：529 KB
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• 作者单位：Minhui Xu (1)
  Xiaogang Gu (1)
  Shuguang Lu (1)
  Zhouwei Miao (1)
  Xueke Zang (1)
  Xiaoliang Wu (1)
  Zhaofu Qiu (1)
  Qian Sui (1)
  
  1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
  
• 刊物主题：Environment, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：2095-221X

文摘

The thermally activated persulfate (PS) degradation of carbon tetrachloride (CT) in the presence of formic acid (FA) was investigated. The results indicated that CT degradation followed a zero order kinetic model, and CO ₂ – · was responsible for the degradation of CT confirmed by radical scavenger tests. CT degradation rate increased with increasing PS or FA dosage, and the initial CT had no effect on CT degradation rate. However, the initial solution pH had effect on the degradation of CT, and the best CT degradation occurred at initial pH 6. Cl– had a negative effect on CT degradation, and high concentration of Cl– displayed much strong inhibition. Ten mmol·L–1HCO ₃ – promoted CT degradation, while 100 mmol·L–1NO ₃ – inhibited the degradation of CT, but SO ₄ 2– promoted CT degradation in the presence of FA. The measured Cl–concentration released into solution along with CT degradation was 75.8% of the total theoretical dechlorination yield, but no chlorinated intermediates were detected. The split of C-Cl was proposed as the possible reaction pathways in CT degradation. In conclusion, this study strongly demonstrated that the thermally activated PS system in the presence of FA is a promising technique in in situ chemical oxidation (ISCO) remediation for CT contaminated site.