铅离子印迹聚合物对Pb2+的选择性吸附研究
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O633

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国家自然科学基金项目(41072173)


Adsorption and Recognition Performance of Lead Ion imprinted Micro beads
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    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+,Ni2+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90.9 mg·g-1,为吸附剂的重复使用提供了依据.

    Abstract:

    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 o,o’ 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 and 46.5, respectively. Meanwhile it shows a certain adsorption capacity for Cr3+ and Cu2+, the selectivity coefficient of Pb2+/ Cr3+ 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.

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顾金英,孙熔,葛婷婷,朱志良.铅离子印迹聚合物对Pb2+的选择性吸附研究[J].同济大学学报(自然科学版),2013,41(10):1507~1512

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  • 收稿日期:2012-08-07
  • 最后修改日期:2013-07-10
  • 录用日期:2013-06-09
  • 在线发布日期: 2013-09-29
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