Selective preconcentration of trace thorium from aqueous solutions with Th(IV)-imprinted polymers prepared by a surface-grafted technique
Selective preconcentration of trace thorium from aqueous solutions with Th(IV)-imprinted polymers prepared by a surface-grafted technique
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DOI：
10.1080/03067311003629677
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发表时间：
2011-07
影响因子：
2.6
通讯作者：
Can-Rong Lin;Hongqing Wang;Yuyuan Wang;L. Zhou;Junfei Liang
中科院分区：
文献类型：
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作者：
Can-Rong Lin;Hongqing Wang;Yuyuan Wang;L. Zhou;Junfei Liang
以甲基丙烯酸（MAA）为功能单体，采用表面接枝技术在硅胶表面制备了一种用于选择性固相萃取钍的离子印迹吸附剂。用3mol L−1 HCl溶液去除Th（IV）离子后，得到的Th（IV）印迹粒子具有特异性识别和较快的动力学过程。离子印迹聚合物对Th（IV）的最大静态吸附量为33.2 mg g−1，总动态吸附量为17.3 mg g−1。印迹聚合物与非印迹聚合物的选择性系数比较表明，印迹基质对Th(IV)/U（VI）、Th(IV)/Ce（III）、Th(IV)/La（III）和Th(IV)/Zr（IV）的选择性分别是非印迹基质的58.8倍、107倍、106.4倍和151.7倍。在上样流量为3 mL min−1的条件下，富集系数为14.6，检出限为0.59µg L−1。在最佳条件下，方法的相对标准偏差为2.1% （n = 7）。该方法成功地应用于实际水样中痕量Th（IV）的测定，结果令人满意。
A novel ion-imprinted adsorbent for selective solid phase extraction of thorium(IV) based on the surface of silica gel was prepared by a surface-grafted technique with methacrylic acid (MAA) as a functional monomer. After removal of Th(IV) ions with 3 mol L−1 HCl solution, the obtained imprinted particles for Th(IV) exhibited specific recognition and relatively rapid kinetic process. The maximum static and total dynamic adsorption capacity of the ion-imprinted polymers (IIPs) for Th(IV) was 33.2 and 17.3 mg g−1, respectively. A comparison of the selectivity coefficient of the imprinted polymers with that of non-imprinted polymers showed that the imprinted matrix for Th(IV)/U(VI), Th(IV)/Ce(III), Th(IV)/La(III) and Th(IV)/Zr(IV) was 58.8, 107, 106.4 and 151.7 times greater than non-imprinted matrix, respectively. With a series of samples loading flow rate of 3 mL min−1 for preconcentration, an enrichment factor of 14.6 and the detection limit of 0.59 µg L−1 were obtained. The relative standard deviation of the method under optimum conditions was 2.1% (n = 7). The developed method was successfully applied to the determination of trace Th(IV) in real water samples with satisfactory results.