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纳米Fe、Si体系对3,3′,4,4′-四氯联苯的脱氯降解
  • ISSN号:1000-6923
  • 期刊名称:中国环境科学
  • 时间:0
  • 页码:761-767
  • 分类:X592[环境科学与工程—环境工程]
  • 作者机构:[1]安徽农业大学资源与环境学院,安徽合肥230036, [2]安徽农业大学生物技术中心,安徽合肥230036
  • 相关基金:国家“973”项目(2007CB936604); 国家自然科学基金资助项目(40971182)
  • 相关项目:Fe(Ⅲ)的异化还原对土壤中汞甲基化的影响及其作用机制
中文摘要:

研究了纳米Fe、Si体系降解3,3′,4,4′-四氯联苯(PCB77)的动力学差异.结果表明,纳米Fe0、纳米Fe3O4和纳米Si0对PCB77均有降解作用,该降解为还原脱氯反应.降解过程符合准一级反应动力学,反应速率常数Kobs分别为0.0177,0.0038,0.0045h-1.PCB77初始浓度为5mg/L,纳米材料投加量为5g/L,溶液pH4.5条件下,纳米Fe0体系对PCB77降解效果最为显著,64h时PCB77残留率仅为19.83%,氯离子浓度为50.3μmol/L,反应体系pH值从4.5升至5.26.纳米双元体系Fe0和Si0、Fe3O4和Si0对PCB77降解过程也符合准一级反应动力学,反应速率常数Kobs分别为0.0114,0.004h-1,其中纳米Fe0和Si0体系降解效果优于纳米Fe3O4和Si0体系.PCB77残留率分别为34.91%和66.62%,氯离子浓度分别为40.07,20.47μmol/L,反应体系pH值变化不明显.随着溶液初始pH值增加,纳米Fe0、纳米Fe3O4降解PCB77效果明显降低,但溶液pH值升高有利于纳米Si0对PCB77的降解.两组纳米双元体系对PCB77的降解效果受pH值影响小.

英文摘要:

The degradation kinetics of 3,3′,4,4′-tetrachlorobiphenyl(PCB77) by nanometer-sized iron and silicon were studied.PCB77 could be dechlorinated by nanometer-sized Fe0,Fe3O4 and Si0,which followed with the pseudo first-order reaction kinetics,and the reaction rates(Kobs) were 0.0177h-1,0.0038 h-1 and 0.0045h-1,respectively.When the initial concentration of PCB77 was 5 mg/L,the amount of nanomaterials was 5 g/L and pH was at 4.5,the degradation efficiencies of nanometer-sized Fe0 to PCB77 was the highest,and the residual rate of PCB77 was 19.83% after 64 h and the concentration of chlorion was 50.3 μmol/L with significant change of pH from 4.5 to 5.26.Similarly,the degradation of PCB77 by nanometer-sized Fe0 and Si0,Fe3O4 and Si0 composition followed the pseudo first-order reaction kinetics,and the reaction rates(Kobs) were 0.0114 h-1 and 0.004 h-1 respectively.The degradation efficiencies of nanometer-sized Fe0 and Si0 composition were better than nanometer-sized Fe3O4 and Si0 combination,the residual rates of PCB77 were 34.91% and 66.62%,and the concentrations of chlorion were 40.07 μmol/L and 20.47 μmol/L without the change of pH.The degradation efficiencies of nanometer-sized Fe0 and Fe3O4 to PCB77 decreased with increasing of initial pH,while the degradation efficiencies of nanometer-sized Si0 to PCB77 increased with increasing of initial pH.The degradation efficiencies of nanometer-sized Fe0 and Si0,Fe3O4 and Si0 composition were not almost influenced by pH.

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期刊信息
  • 《中国环境科学》
  • 中国科技核心期刊
  • 主管单位:中国科协
  • 主办单位:中国环境科学学会
  • 主编:王文兴
  • 地址:北京市海淀区红联南村54号
  • 邮编:100082
  • 邮箱:zghjkx1981@126.com
  • 电话:010-62215145
  • 国际标准刊号:ISSN:1000-6923
  • 国内统一刊号:ISSN:11-2201/X
  • 邮发代号:2-572
  • 获奖情况:
  • 国家期刊提名奖,国家“双效”期刊,第三届中国科协优秀科技期刊一等奖
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘(网络版),英国农业与生物科学研究中心文摘,波兰哥白尼索引,荷兰文摘与引文数据库,美国工程索引,美国剑桥科学文摘,英国科学文摘数据库,英国动物学记录,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:47702