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.
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