铅离子显色印迹吸附剂的制备及其吸附性能  

Synthesis and adsorption properties of Pb^(2+) chromogenic imprinted adsorbent

作　　者：程文霞[1] 刘成伦[1] 谢太平 

机构地区：[1]重庆大学化学化工学院,重庆400030 [2]煤矿灾害动力学与控制国家重点实验室,重庆400030

出　　处：《功能材料》2013年第4期569-572,共4页Journal of Functional Materials

基　　金：重庆市重点攻关资助项目(2011AB7060)

摘　　要：以Pb2+为模版分子,在硅胶表面接枝双硫腙,利用溶胶-凝胶法合成一种Pb2+显色印迹吸附剂(MIPs)。采用红外(IR)和扫描电镜(SEM)对MIPs进行了表征。通过平衡吸附实验,研究了MIPs的吸附性能、显色性能和其对Pb2+的选择识别性能。结果表明,双硫腙通过与硅胶形成氢键而接枝在硅胶表面;MIPs对Pb2+的显色限为10μmol/L;在Cd2+存在的条件下,其对Pb2+的相对选择系数为250;MIPs对Pb2+的吸附可以用Langmiur等温吸附方程来拟合,吸附焓变为66.054kJ/mol。制备的MIPs在5min内吸附率可以达到97%,可以用于含铅废水中Pb2+的分离和测定。A new type of Pb2＋ chromogenic imprinted adsorbent was prepared by sol-gel approach with Pb2＋ as the template and dithizone grafting onto the silica gel surface.The adsorbent was characterized by FT-IR and scanning electron microscopy.The adsorption property,chromogenic property and selective recognition ability of the adsorbent were studied by equilibrium-adsorption method.Results showed that the dithizone was coated on the silica gel through hydrogen bond.The chromogenic limit of the printed adsorbent was 10μmol/L,the relative selectivity coefficient was 250 while Cd2＋ existed;the extraction behavior of the Pb2＋ was conformed by Langmuir＇s equation and the enthalpy of adsorption was 66.054kJ/mol.The adsorption capacity reached 97% in 5 min and it could be used for separation and determination of trace Pb2＋ in the waste water.

关 键 词：显色印迹吸附剂 铅离子 双硫腙 吸附 吸附热力学 

分 类 号：O647.33[理学—物理化学] TQ31[理学—化学]