Zhai Yunhui, Yang Dong, Chang Xijun, Liu Yongwen, He Qun
Department of Chemistry, Lanzhou University, Lanzhou P. R. China.
J Sep Sci. 2008 Apr;31(6-7):1195-200. doi: 10.1002/jssc.200700392.
A novel Cu(II)-imprinted polymer sorbent was prepared by an ion-imprinted polymer (IIP) technique using (2Z)-N,N'-bis(2-aminoethylic)but-2-enediamide as the functional monomer and pentaerythritol triacylate as a crosslinker. IR, XPS, and elemental analysis techniques were used to confirm the obtained product. Subsequently, when this polymer was used as sorbent in SPE, it exhibited excellent selectivity for template ion from an aqueous solution. Quantitative extraction of Cu(II) was achieved in the pH range of 4-7. The time needed to extract each sample was less than 30 min by the batch method. The distribution ratio (D) values of IIP for Cu(II) were greatly larger than that for other ions. At optimal pH value, the maximum extraction capacity of IIP and nonimprinted polymer (NIP) was found to be 29.8 and 7.0 mg/g, respectively. The adsorption behavior of Cu(II) on the sorbents could be described by Langmuir adsorption isotherm equation. The feasible flow rate of Cu(II)-containing solution for quantitative extraction onto the column packed with IIP was 1-4 mL/min, whereas for elution it was less than 1 mL/min. The developed method was successfully applied to the separation and enrichment of trace Cu(II) in biological and natural water samples with satisfactory results.
采用离子印迹聚合物（IIP）技术，以（2Z）-N，N'-双（2-氨乙基）丁-2-烯二酰胺为功能单体，季戊四醇三酰基酯为交联剂，制备了一种新型的Cu（II）印迹聚合物吸附剂。采用红外光谱（IR）、X射线光电子能谱（XPS）和元素分析技术对所得产物进行了表征。随后，将该聚合物用作固相萃取（SPE）中的吸附剂时，它对水溶液中的模板离子表现出优异的选择性。在pH值为4-7的范围内实现了Cu（II）的定量萃取。采用分批法萃取每个样品所需时间少于30分钟。IIP对Cu（II）的分配比（D）值远大于对其他离子的分配比。在最佳pH值下，发现IIP和非印迹聚合物（NIP）的最大萃取容量分别为29.8和7.0 mg/g。Cu（II）在吸附剂上的吸附行为可用Langmuir吸附等温方程描述。用装有IIP的柱对含Cu（II）溶液进行定量萃取的可行流速为1-4 mL/min，而洗脱时的流速小于1 mL/min。所建立的方法成功应用于生物和天然水样中痕量Cu（II）的分离和富集，结果令人满意。
