摘要
以Cu2+为模板,环氧氯丙烷(ECH)为交联剂,羧基碳纳米管(MWNTs-COOH)为载体,采用"Grafting onto"方法在羧基碳纳米管表面键连大分子链聚乙烯亚胺(PEI),制备了功能单体MWNTs-CO/PEI,获得铜离子印迹材料。利用FTIR、TEM对产物进行了表征,探讨了模板离子的初始浓度、溶液pH值、吸附时间对吸附容量的影响,以及印迹材料的吸附选择性和重复使用率。结果表明,PEI中的N-H键断裂,H原子被烷基取代,环氧氯丙烷发生开环反应,键连到PEI的N原子上;羧基碳纳米管表面包覆了一层厚度约为20nm的印迹层,呈蜂窝状;在Cu2+初始质量浓度为100mg/L、pH=6、吸附时间为1h时,Cu2+-IIP印迹材料和非印迹材料的最大吸附容量分别为43.68mg/g和21.85mg/g;在同时存在Cu2+、Zn2+的溶液中,印迹材料的选择性能较好;重复使用时,吸附性能稳定。
Cu2＋ was selected as template,ECH as crosslinker,MWNTs-COOH as carrier,the macromolecular chain PEI were bonded at the surface of MWNTs-COOH using ＂Grafting onto＂ method,functional monomer MWNTs-CO/PEI and Cu2＋-IIP materials were prepared.The imprinted materials were characterized by FTIR and TEM.The effect of template ions initial concentration,the solution pH and adsorption time on adsorption capacity were discussed,selective adsorption and reusability were also researched.The results show that the N-H bond in PEI is broken,H atom substituted by an alkyl group,the ring of ECH is opened and bonded with N atom.MWNTs-COOH was coated with a layer thickness of about 20 nm imprinted layer,which showed honeycomb.When the initial concentration of Cu2＋ was 100 mg/L,pH=6 and the adsorption time of 1 h,the largest adsorption of Cu2＋-IIP and NIP materials were 43.68 mg/g and 21.85 mg/g.Cu2＋ and Zn2＋ were existed in solutions,the imprinted material have a good choice for Cu2＋,and repeatability better.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2014年第2期103-106,共4页
Materials Reports
基金
江西省研究生创新专项基金(YC2012-S088)
放射性地质与勘探技术国防重点学科实验室开放基金(2011RGET014)
