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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.08.009

Keywords: 2-氯苯酚,过硫酸钾,降解

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Abstract:

利用加入活化K2S2O8产生的硫酸根自由基(SO4-·)降解水中2-氯苯酚(o-chlorophenol),探讨了温度、pH、腐殖酸(HA)、无机离子对2-氯苯酚降解的影响.结果表明,增加溶液中过硫酸盐的浓度或提高溶液反应温度,可促进2-氯苯酚的降解,而且2-氯苯酚的降解符合准一级反应动力学规律,其反应表观活化能为4.32kJ·mol-1.酸性条件下2-氯苯酚的降解效果明显好于碱性条件.2-氯苯酚的降解受到Cl-、CO32-和腐殖酸的影响.其中,腐殖酸和CO32-都对反应有明显的抑制作用.Cl-在酸性和中性条件下也会抑制2-氯苯酚降解,但在碱性条件对反应影响不大.2-氯苯酚在SO4-·的作用下会最终降解为乙酸等小分子有机物并最终矿化,有时会伴随有中间产物二聚物的生成.

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