以UO(2+)2为印迹离子,偶氮二异丁腈(AIBN)为引发剂,邻苯二酚-UO(2+)2乙烯基吡啶三元配合物为模板,与苯乙烯单体、交联剂二乙烯基苯在甲醇溶液中通过共聚反应制备了UO(2+)2印迹聚合物微球.该印迹聚合物微球经6mol/LHCl处理后留下与铀酞离子大小相匹配的空穴,对水溶液中微量铀有富集作用,在pH=5～7及吸附时间在20min以上时,该印迹聚合物微球对水溶液中微量铀的吸附率可达99%以上,且具有良好的选择性;HCl浓度在1.0mol/L以上,淋洗体积为聚合物体积的5倍以上,淋洗时间在20min以上时洗脱率可达99%以上.将其应用于卤水中微量铀的测定,与标准方法相比较,所得结果令人满意.%Uranyl ion imprinted polymer beads were prepared by the copolymerization of styrene monomer and divinyl benzene as crosslinking agent in methanol solution, with the UO22+-o-dihydroxybenzene -4-vinyl pyridine ternary complex as template, the 2,2＇azo-bis-isobutyronitrile as initiator and UO22+ as the imprinting ion. The uranyl ions were removed from the polymer beads by treating with 6 mol/L HC1, leaving behind cavities that match uranyl ion in size. The treated polymer beads can preconcentrate uranyl ions from dilute aqueous solutions. The adsorption efficiency can reach 99％ or above with good selectivity when pH is in the range of 5-7 and the adsorption time is more than 20 min. The elution rate can reach above 99 ％ under the conditions of concentration of HCl being above 1.0 mol/L, elution time more than 20 min and the elution volume more than 5 times the volume of ion imprinted polymer. The uranyl ion imprinted polymer beads have been successfully applied to determine micro-uranium in brine samples. The results are satisfactory compared with NBS method.
展开▼
