李云琴,许俊鸽,周海瑞,苑宝玲.包覆型纳米铁的制备及其降解三氯乙烯的性能研究[J].环境科学学报,2014,34(12):2985-2990
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
- 基金项目：福建省自然科学基金项目(No. 2012J05094);教育部新世纪优秀人才支持计划(No. NCET-11-0853)
- 李云琴
- 1. 福州大学土木工程学院, 福州 351020;2. 福州大学环境与资源学院, 福州 351020
- 周海瑞
- 福州大学环境与资源学院, 福州 351020
- 苑宝玲
- 1. 福州大学土木工程学院, 福州 351020;2. 华侨大学土木工程学院, 厦门 361021
- 摘要：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-nZVI)是在纳米铁颗粒(nZVI)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%.
- Abstract：Encapsulated nanoscale zero-valent iron (En-nZVI)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-nZVI particles were investigated by XRD, FI-IR and TEM analysis. The results showed that the En-nZVI particles with the PMMA stable layer wrapped outside was formed by in-situ polymerization. The obtained En-nZVI particles were uniform, disperse and stable in the air in 3 days with slow oxidation. Better degradation and higher dechlorination of TCE by En-nZVI particles could be achieved, and the degradation and dechlorination rates could reach 92% and 90% after 24h reaction, respectively.
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