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环境化学  2015 

DOI:10.7524/j.issn.0254-6108.2014.05.007

Keywords: 过硫酸盐,纳米零价铁,2,4-二氯苯酚,氧化降解

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Abstract:

采用纳米零价铁(nZVI)活化过硫酸钠产生强氧化性的硫酸根自由基(SO4-·)去除目标污染物2,4-二氯苯酚(2,4-DCP).通过比较nZVI与Fe2+催化S2O82-对2,4-DCP的降解,结合SEM、EDS对nZVI反应前后表面结构变化分析发现,nZVI在过硫酸盐氧化降解2,4-DCP中主要起到Fe2+离子源的作用,也具有还原和吸附作用.深入研究不同因素(初始pH值、nZVI投加量、S2O82-初始浓度、2,4-DCP初始浓度)对2,4-DCP降解的影响,结果表明降低溶液初始pH值能提高nZVI/S2O82-对2,4-DCP的降解率.在2,4-DCP初始浓度为30mg·L-1,S2O82-浓度为12.5mmol·L-1,nZVI为2.0g·L-1,pH值为3.0,温度为30℃下,2,4-DCP的去除率能达到92.1%,其降解过程符合准一级动力学,表观活化能为91.48kJ·mol-1,是表面控制过程.

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