磁性聚苯乙烯-苯甲氨二乙酸材料对Cu2+富集性能的研究
Study on the Enrichment Performance of Magnetic Polystyrene- Benzyl Iminodiacetic Acid Composites for Cu2+
投稿时间:2017-08-31  修订日期:2017-10-13
DOI:
中文关键词: 聚苯乙烯-苯甲氨二乙酸  磁性材料  铜离子  吸附
英文关键词: Polystyrene-benzyl iminodiacetic acid  magnetic material  copper ions  absorption
基金项目:国家自然科学基金(21571192)中南民族大学开放实验室技改项目(CX201601)
作者单位E-mail
张慧娟 中南民族大学 化学与材料科学学院 huistar119@163.com 
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中文摘要:
      为制备新型材料用于快速分离富集水中的微量铜元素,以磁性硅胶微球为核,N-(4-乙烯基)-苯甲氨二乙酸为单体,二乙烯基苯为交联剂,采用热引发聚合成功地制备了磁性聚苯乙烯-苯甲氨二乙酸复合材料.通过傅里叶红外光谱、透射电镜和热重分析对复合材料的组成和结构特性进行了表征,并以Cu2+为考察对象研究了其富集性能和相关吸附动力学.结果表明:具有活性基团的聚合物成功地包覆在了Fe3O4纳米粒子表面. 当Cu2+溶液浓度为25 mg?L-1、体积为10 mL, pH值为5时,10 mg吸附剂在15 min达到吸附平衡且吸附率可达93%.采用2 mL(0.1 mol?L-1)乙二胺四乙酸溶液在15 min可对其完成小体积快速洗脱,洗脱率可达95%.Cu2+在材料上的吸附行为与准二级动力学模型拟合较好.
英文摘要:
      In order to prepare new materials for the rapid separation and enrichment of trace copper in water sample, magnetic polystyrene-benzyl iminodiacetic acid materials was prepared successfully by using thermal induced polymerization based on magnetic silica microsphere. N-(4-vinyl)-benzyl iminodiacetic acid and divinyl benzene was chosen as the monomer and cross-linker respectively. The composition and structure characteristics of the resulting materials were characterized by Fourier transform infrared spectroscopy, transmission electron microscopy, thermogravimetric analysis. Cu2+ was used as the target ion to study the enrichment performance of the resulting materials and its related adsorption kinetics.The result showed that the prepared polymer with active groups was successfully coated on the surface of Fe3O4 nanoparticles. The adsorption equilibrium was achieved within 15 min with the adsorption rate of 93% by using 10 mg adsorbent under the condition of initial Cu2+concentration of 25 mg?L-1 ,the volume is 10mL,and pH value of 5.0. 95%Cu2+could be eluted from the resulting materials by using 2 mL of EDTA solution (0.1 mol?L-1) within 15 min. The adsorption behavior of Cu2+ on the prepared material fitted well with the pseudo two-order kinetics model.
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