论文部分内容阅读
以镍离子(Ni~(2+))为模板、4-乙烯基吡啶(4-VP)为功能单体、二乙烯基苯(DVB)为交联剂,采用沉淀聚合法制备了镍离子印迹聚合物,并采用正交试验对制备工艺进行优化,发现Ni~(2+)与4-VP用量比为1∶5(wt,质量比,下同)、Ni~(2+)与8-羟基喹啉(8-HQ)的用量比为1∶2、4-VP与DVB用量比为1∶6(Vol,体积比)、乙腈与甲苯(乙腈与甲苯的体积比为3∶1)的混合溶剂80mL时制备的聚合物具有最佳吸附能力。用红外光谱和扫描电子显微镜对聚合物的结构和形态进行表征,结果表明聚合物中存在与Ni~(2+)相互作用的特征基团。通过对聚合物吸附性能的测定,发现聚合物最佳吸附pH=8.0,达到吸附平衡的时间为4h,饱和吸附量为1.170mg/g,相对选择系数αNi/M远大于1,表明该聚合物对Ni~(2+)具有良好的选择吸附能力。
Nickel ion imprinting was prepared by precipitation polymerization using nickel ion (Ni 2+) as template, 4-vinylpyridine (4-VP) as functional monomer and divinylbenzene (DVB) as crosslinking agent The optimum conditions were as follows: the molar ratio of Ni 2+ to 4-VP was 1: 5 (wt, mass ratio, the same below), Ni 2+ and 8- (8-HQ) was 1: 2, the ratio of VP to DVB was 1: 6 (vol), and the ratio of acetonitrile to toluene (the volume ratio of acetonitrile to toluene was 3:1) When 80mL mixed solvent prepared polymer has the best adsorption capacity. The structure and morphology of the polymer were characterized by FTIR and scanning electron microscopy. The results showed that there existed some characteristic groups in the polymer which interacted with Ni 2+. Through the determination of the adsorption properties of the polymer, it was found that the optimum adsorption time of the polymer is pH = 8.0, equilibrium adsorption time is 4h, the saturated adsorption capacity is 1.170mg / g, the relative selectivity coefficient αNi / M is much larger than 1, indicating that the polymer Ni ~ (2+) has a good choice of adsorption capacity.