| 杨冰,Pignatello Joseph J,曲东.利用固体类Fenton试剂降解五氯酚的探讨[J].农业环境科学学报,2015,34(10):1914-1920. |
| 利用固体类Fenton试剂降解五氯酚的探讨 |
| Decontamination of Pentachlorophenol Using Solid Fenton-like Reagents |
| 投稿时间：2015-07-10 |
| DOI：10.11654/jaes.2015.10.011 |
| 中文关键词: 五氯酚 化学降解 固体过氧化物 铁矿物 芬顿反应 |
| 英文关键词: pentachlorophenol chemical degradation solid peroxide iron mineral Fenton reaction |
| 基金项目:国家自然科学基金面上项目(41171204);NationalInstituteofFoodandAgriculture,U.S.DepartmentofAgriculture(Hatchprogram) |
| 作者 | 单位 | E-mail | | 杨冰 | 西北农林科技大学资源环境学院, 陕西 杨凌 712100
Department of Environmental Sciences, The Connecticut Agricultural Experiment Station, 123 Huntington Street, P.O. Box 1106, New Haven, Connecticut 06504-1106, United States | | | Pignatello Joseph J | Department of Environmental Sciences, The Connecticut Agricultural Experiment Station, 123 Huntington Street, P.O. Box 1106, New Haven, Connecticut 06504-1106, United States | | | 曲东 | 西北农林科技大学资源环境学院, 陕西 杨凌 712100 | dongqu@nwafu.edu.cn |
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| 中文摘要: |
| 采用四种固体过氧化物(过氧化钙,CP;过硼酸钠,SPB;过碳酸钠,SPC;过氧化尿素,UHP)以及H2O2和两种铁源[(Fe3(PO4)2和FeSO4],通过室内模拟试验,研究不同过氧化物和Fe(Ⅱ)源组合构成的(类)Fenton反应对石英砂中五氯酚(PCP)的降解能力,探讨了影响类Fenton试剂活性成分有效性和持续性的主要因素.结果表明,使用FeSO4为铁源,添加CP、SPB或SPC使体系pH快速升高至10~12,极大抑制了铁源有效性,仅在反应初期对PCP有快速降解,24 h降解率分别为22.0%、14.6%和17.3%;添加H2O2或UHP对体系的pH无明显影响,24 h降解率为86.5% 和 83.8%;但在24~48 h,PCP降解均无明显增加,表明活性成分已殆尽.使用人工合成的纳米级Fe3(PO4)2为铁源,能够持续稳定地提供Fe(Ⅱ),在0~20 d实验期间PCP均有持续降解,在20 d时CP、SPB、SPC和UHP对PCP的降解率分别为30.1%、13.6%、8.6%、37.0%,H2O2对PCP在16 d时的降解率为55.6%.因此,使用致碱性过氧化物作为类Fenton试剂时,需要添加pH缓冲剂以提高对有机物的降解率;UHP在一定程度上可以替代H2O2.尽管固体类Fenton试剂对石英砂中PCP的去除率低于传统Fenton试剂,但活性成分持续时间能由不到24 h增加至20 d以上,故在土壤污染修复中具有更大潜力. |
| 英文摘要: |
| In this study, four types of solid peroxides(calcium peroxide, CP;sodium perborate, SPB;sodium percarbonate, SPC;urea hydrogen peroxide, UHP), H2O2, and two iron sources[Fe3(PO4)2 and FeSO4] were used to investigate pentachlorophenol(PCP) degradation in silica sand slurries by Fenton-like reactions in incubation experiment. The main factors influencing the effectiveness and sustainability of active components of Fenton-like reagents were explored. Adding CP, SPB or SPC quickly increased solution pH to 10~12 and significantly inhibited Fe(Ⅱ) effectiveness. However, H2O2 or UHP showed little effect on solution pH. The rate of PCP degradation was 22.0%, 14.6%, 17.3%, 86.5% and 83.8%, respectively, for CP, SPB, SPC, UHP and H2O2 with FeSO4 as Fe(Ⅱ) source in 24 hours, and no obvious further PCP degradation was observed from 24 to 48 hours. For treatments with Fe3(PO4)2 as a steady Fe(Ⅱ) source, however, PCP showed continuous degradation during 20 d experimental period. The PCP degradation rate on the 20th day was 30.1%, 13.6%, 8.6% and 37.0%, for CP, SPB, SPC and UHP, respectively. Applying H2O2 resulted in 55.6% degradation of PCP in 16 days in Fe3(PO4)2 Fenton reaction. The present results show that pH buffer is required for a better decontamination performance when using alkaline-inducing solid peroxides(CP, SPB and SPC) as Fenton-like reagents. UHP might be an alternative for H2O2. Solid Fenton-like reagents significantly extend active components′ life time from less than 24 hours to more than 20 days, thus possessing greater potential for soil contamination remediation. |
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