磁性纳米材料的制备及其吸附重铬酸根离子的性能  

Preparation of Magnetic Nanomaterials and Its Adsorption Properties Towards Cr_2O_7^(2-)

作　　者：张立[1,2] 张剑[2] 张祖磊[2] 刘海清[2] 李蕾[1,2] 

机构地区：[1]常州大学化学化工学院,常州213016 [2]嘉兴学院生物与化学工程学院,嘉兴314001

出　　处：《应用化学》2013年第8期927-931,共5页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(21177049);浙江省科技计划(2011C22096;2011C37033);嘉兴市科技计划(2010AY1018;2011AY1027)资助项目

摘　　要：采用沉降法合成的Fe3O4,通过二氧化硅的包裹和3-氯丙基三甲基硅烷处理后键合聚乙烯亚胺(PEI)、季铵盐化等步骤合成功能化的磁性纳米材料。二氧化硅的包裹增加了Fe3O4纳米颗粒的分散性和稳定性。使用FT-IR、SEM、TG和振动样品磁强计对其进行了表征,结果表明,成功的改性了磁性纳米材料。采用静态法研究了磁性纳米材料对重铬酸根的吸附性能及各种因素对吸附性能的影响。分离富集环境中重铬酸根的适宜条件为:酸性介质,温度25℃,重铬酸钾的浓度0.8 g/L,吸附量120 mg/g,接枝量越大,吸附量增加。Fe3O4 magnetic nanoparticles were first prepared using the coprecipitation method and were coated by SiO2. Functional magnetic nanometer materials were then obtained through bonding polyethylenimine（PEI） on the surface of SiO2 and quaternarization with benzyl chloride. Coating of SiO2 could increase the dispersion and stability of Fe3O4 nanometer materials. FT-IR, SEM, TG and vibrating sample magnetometer were used to characterize the magnetic nanomaterials. The results showed that the synthesis of magnetic nanomaterials was successful. The static adsorption method was employed to study the adsorption properties of magnetic nanomaterials towards Cr2O2-7 and various factors which might influence the adsorption performance of the materials. The optimal conditions for the separation and enrichment environment of heavy chrome acid radical are：acid medium, the temperature is 25 ℃, potassium dichromate concentration is 0.8 g/L, the adsorption quantity for 120 mg/g, grafting, the greater the amount of adsorption quantity increase.

关 键 词：磁性纳米材料 二氧化硅 聚乙烯亚胺 分散性 稳定性 

分 类 号：O611.4[理学—无机化学]