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利用表面印迹技术,以α-甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂在偶氮二异丁腈的引发下发生交联反应生成砷离子印迹聚合物。采用电镜扫描与傅里叶红外光谱对印迹聚合物进行形貌与结构的表征;采用静态吸附法对印迹聚合物吸附过程的pH影响、吸附等温模型和吸附动力学进行研究;同时还研究了在竞争离子存在的情况下砷离子印迹聚合物的选择吸附性能。在25℃、pH=6时,印迹聚合物的吸附量约为非印迹聚合物的1.5倍,对砷离子的吸附过程基本吻合Langmuir吸附等温模型;在动力学研究中发现,吸附过程更为符合准二级动力学方程;在竞争离子存在的情况下,砷离子印迹聚合物有着良好的选择吸附性。
Using a surface imprinting technique, α-methacrylic acid as a functional monomer and ethylene glycol dimethacrylate as a cross-linking agent are cross-linked to form arsenic ion imprinted polymer under azobisisobutyronitrile. The morphology and structure of the imprinted polymer were characterized by scanning electron microscopy and Fourier transform infrared spectroscopy (FTIR). The adsorption and adsorption kinetics of the imprinted polymer were investigated by static adsorption method. At the same time, Selective adsorption of arsenic ion imprinted polymers in the presence of competing ions. The adsorption amount of imprinted polymer is about 1.5 times that of non-imprinted polymer at 25 ℃ and pH = 6. The adsorption process of arsenic ion is basically consistent with the Langmuir adsorption isothermal model. The kinetic study shows that the adsorption process is more consistent Quasi-second order kinetic equation; in the presence of competitive ions, arsenic ion imprinted polymers have a good choice of adsorption.