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超声波-空气体系对溶液中五氯酚的降解

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孙仁超, 田凯勋, 杨广超, 明翠香, 杨超. 超声波-空气体系对溶液中五氯酚的降解[J]. 环境工程学报, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
引用本文: 孙仁超, 田凯勋, 杨广超, 明翠香, 杨超. 超声波-空气体系对溶液中五氯酚的降解[J]. 环境工程学报, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
shu
SUN Renchao, TIAN Kaixun, YANG Guangchao, MING Cuixiang, YANG Chao. Degradation of pentachlorophenol in aqueous solutions by ultrasonic-air system[J]. Chinese Journal of Environmental Engineering, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
Citation: SUN Renchao, TIAN Kaixun, YANG Guangchao, MING Cuixiang, YANG Chao. Degradation of pentachlorophenol in aqueous solutions by ultrasonic-air system[J]. Chinese Journal of Environmental Engineering, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
shu

超声波-空气体系对溶液中五氯酚的降解

  • 1.

    湘潭大学环境科学与工程系, 重金属污染控制湖南省普通高等学校重点实验室, 湘潭 411105

  • 基金项目:

    湖南省科技厅科技计划一般项目(2013FJ4061)

    湘潭大学博士启动资金项目(14QDZ16)

  • 中图分类号: X703

Degradation of pentachlorophenol in aqueous solutions by ultrasonic-air system

  • 1.

    Key Laboratory Heavy Metal Pollution Control, College of Hunan Province, Department of Environmental Science and Engineering, Xiangtan University, Xiangtan 411105, China

  • Fund Project:

  • 摘要: 以五氯酚(PCP)为目标污染物,研究了超声波-空气体系对PCP降解的可行性和降解特性。溶液温度和初始pH对五氯酚吹脱作用实验表明,在弱酸性和碱性条件下空气对五氯酚基本无吹脱作用;空气流量、初始pH、温度、反应物浓度等因素对超声波-空气体系降解五氯酚的影响实验表明,当空气流量为25 mL·min-1,pH=5时,去除效果最优,低温、低浓度有利于五氯酚降解;考察了5种常见金属离子对强化降解五氯酚的影响,其强化作用顺序依次为Fe2+ > Cu2+ > Al3+ > Zn2+ > CK > Mg2+(CK为空白),Fe2+与体系之间存在协同效应;降解机理研究表明,体系对五氯酚的降解以自由基氧化作用为主,H2O2氧化为辅,空气的加入能明显促进H2O2的产生,加入Fe2+后,H2O2与之反应生成·OH,导致H2O2含量急剧减少。
    Abstract: Feasibility and degradation characteristics of pentachlorophenol(PCP) in ultrasonic(US)-Air systems were studied.The temperature and initial pH affected the air stripping of PCP such that weak acid and alkaline solutions hardly exhibited any stripping.The effects of air flow,initial pH,temperature,and reactant concentration on the sonolysis of PCP in the US-Air system were investigated.An optimal removal efficiency was obtained at pH 5,with an air flow of 25 mL·min-1;a lower temperature or PCP concentration was conducive to its degradation.The effect of five metal ions on the PCP degradation was determined as follows:Fe2+ > Cu2+ > Al3+ > Zn2+ > CK > Mg2+.Synergistic effects between Fe2+ and the US-Air system were also observed.Mechanisitic studies of PCP degradation in the US-Air system were primarily based on free radical oxidation;hydrogen peroxide oxidation played a secondary role.Addition of air evidently promoted the production of hydrogen peroxide,which decreased sharply after the addition of Fe2+ due to a reaction between hydrogen peroxide and Fe2+.
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  • 收稿日期:  2015-05-23
  • 刊出日期:  2016-07-06
孙仁超, 田凯勋, 杨广超, 明翠香, 杨超. 超声波-空气体系对溶液中五氯酚的降解[J]. 环境工程学报, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
引用本文: 孙仁超, 田凯勋, 杨广超, 明翠香, 杨超. 超声波-空气体系对溶液中五氯酚的降解[J]. 环境工程学报, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
shu
SUN Renchao, TIAN Kaixun, YANG Guangchao, MING Cuixiang, YANG Chao. Degradation of pentachlorophenol in aqueous solutions by ultrasonic-air system[J]. Chinese Journal of Environmental Engineering, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
Citation: SUN Renchao, TIAN Kaixun, YANG Guangchao, MING Cuixiang, YANG Chao. Degradation of pentachlorophenol in aqueous solutions by ultrasonic-air system[J]. Chinese Journal of Environmental Engineering, 2016, 10(7): 3682-3686. doi: 10.12030/j.cjee.201502111
shu

超声波-空气体系对溶液中五氯酚的降解

  • 1. 湘潭大学环境科学与工程系, 重金属污染控制湖南省普通高等学校重点实验室, 湘潭 411105
  • 收稿日期:  2015-05-23
基金项目:

湖南省科技厅科技计划一般项目(2013FJ4061)

湘潭大学博士启动资金项目(14QDZ16)

摘要: 以五氯酚(PCP)为目标污染物,研究了超声波-空气体系对PCP降解的可行性和降解特性。溶液温度和初始pH对五氯酚吹脱作用实验表明,在弱酸性和碱性条件下空气对五氯酚基本无吹脱作用;空气流量、初始pH、温度、反应物浓度等因素对超声波-空气体系降解五氯酚的影响实验表明,当空气流量为25 mL·min-1,pH=5时,去除效果最优,低温、低浓度有利于五氯酚降解;考察了5种常见金属离子对强化降解五氯酚的影响,其强化作用顺序依次为Fe2+ > Cu2+ > Al3+ > Zn2+ > CK > Mg2+(CK为空白),Fe2+与体系之间存在协同效应;降解机理研究表明,体系对五氯酚的降解以自由基氧化作用为主,H2O2氧化为辅,空气的加入能明显促进H2O2的产生,加入Fe2+后,H2O2与之反应生成·OH,导致H2O2含量急剧减少。

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