铅离子印迹聚合物对Pb^(2+)的选择性吸附研究  

Adsorption and Recognition Performance of Lead Ion-imprinted Micro-beads

作　　者：顾金英[1] 孙熔[1] 葛婷婷[1] 朱志良[2] 

机构地区：[1]同济大学化学系,上海200092 [2]同济大学环境科学与工程学院,上海200092

出　　处：《同济大学学报（自然科学版）》2013年第10期1507-1512,共6页Journal of Tongji University:Natural Science

基　　金：国家自然科学基金(41072173)

摘　　要：针对日益严重的水体重金属污染及工业废水处理问题,利用一种由1,12-十二烷-O,O′-二苯基磷酸(DDDPA)和4-乙烯基吡啶作为双功能单体得到新型铅离子印迹聚合物微球,对其吸附及识别性能展开研究,结果表明,铅离子印迹聚合物微球对水中Pb2+有着良好的吸附性能,当溶液pH>5时,就能保持很高的吸附效率.选择性吸附试验研究发现,当共存金属阳离子为Zn2+,Co2+,Ni 2+时,铅离子印迹聚合物微球对目标Pb2+的选择性较好,试验条件下的选择吸附系数分别为86.6,53.0和46.5;铅离子印迹聚合物对Cr3+和Cu2+具有一定的吸附能力,试验条件下的选择吸附系数分别为20.8和9.5.对铅离子印迹聚合物微球的洗脱试验结果表明,洗脱含微量Pb2+的吸附剂时使用低浓度的HNO3就能达到100%脱附.经HNO3脱附后的吸附剂对水中Pb2+的单位饱和吸附量仍然可达90.9mg·g-1,为吸附剂的重复使用提供了依据.As to the problem of the heavy metal pollution in the water environment and the wastewater treatment, a lead ion-imprinted micro-beads, with two functional monomers 1, 12-dodecanediol diphenyl- phosphonic acid（DDDPA） and 4- vinylpyridine, were synthesized. Its adsorption and recognition performance were investigated. The lead ion- imprinted micro-beads were efficient for lead ions removal from the aqueous solutions in a broad pH range （pH~ 5）. In the presence of competitive ions Zn2＋ , Co2＋ , Ni2＋ , it shows a high selectivity for lead ions. The selectivity coefficient of Pb2＋/Zn2＋, Pb2＋/Co2＋ and Pb2＋/Ni2＋ are 86.6, 53.0 and46.5, respectively. Meanwhile it shows a certain adsorption capacity for Cr3＋ and Cu2＋, the selectivity coefficient of Pb2＋ / Cra＋ and Pb2＋ / Cu2＋ are 20.8 and 9.5, respectively. The desorption experiments indicate that the lower concentration of nitric acid has almost 100% removal efficiency for the low quantity of lead ions. After the recycle of adsorption-desorption experiment, the lead ion-imprinted polymer still shows a high adsorption capacity of 90.9 mg . g-1.

关 键 词：铅离子印迹聚合物微球 PB2+ 吸附 脱附 选择性 

分 类 号：O633[理学—高分子化学]