包覆型纳米铁的制备及其降解三氯乙烯的性能研究

Preparation and application of encapsulated nanoscale zero-valent iron in the degradation of trichloroethene

采用甲基丙烯酸甲酯(MMA)为聚合单体,偶氮二异丁腈(AIBN)为引发剂,通过微乳液原位聚合法制备包覆型纳米铁,采用XRD、FI-IR、TEM对其性能进行表征.结果表明:包覆型纳米铁(En-n ZVI)是在纳米铁颗粒(n ZVI)外层形成了稳定的聚甲基丙烯酸甲酯(PMMA)包覆层,包覆后的纳米铁粒径均一、不团聚,并能于空气中放置3 d以上而不被氧化,克服了纳米铁在空气中不能稳定存在的缺点.降解实验结果表明:该纳米材料能有效降解环境污染物三氯乙烯TCE,24 h去除率超过了92%,脱氯率达到90.0%.

Encapsulated nanoscale zero-valent iron( En-n ZVI) particles were prepared by using methyl methacrylate( MMA) as monomer and azobisisobutyronitrile( AIBN) as initiator to embed the nanoscale zero-valent iron particles. The characteristics of En-n ZVI particles were investigated by XRD,FI-IR and TEM analysis. The results showed that the En-n ZVI particles with the PMMA stable layer wrapped outside was formed by in-situ polymerization. The obtained En-n ZVI particles were uniform,disperse and stable in the air in 3 days with slow oxidation. Better degradation and higher dechlorination of TCE by En-n ZVI particles could be achieved,and the degradation and dechlorination rates could reach 92% and 90% after 24 h reaction,respectively.