Cu(Ⅱ)-8-羟基喹啉印迹聚合物的合成与吸附性能研究

Synthesis and Adsorption Property of Cu(Ⅱ)-8-hydroxyquinoline Imprinted Polymer

本文以甲基丙烯酸(MAA)为功能单体,Cu(Ⅱ)和8-羟基喹啉形成的配合物为模板分子,乙二醇二甲基丙烯酸酯(EGDMA)为交联剂,通过反相微乳聚合法(W/O/W)合成了Cu(Ⅱ)-8-羟基喹啉印迹聚合物,用比色法和火焰原子吸收分光光度计对Cu(Ⅱ)离子印迹聚合物吸附Cu(Ⅱ)离子进行定性定量分析.考察了溶液的pH,吸附时间,吸附温度,及初始浓度的影响,pH为7.0时吸附量最大,吸附过程在60min左右达到平衡,吸附动力学可以用假二级吸附速率方程描述,在25℃到45℃范围内,吸附量随着温度的增大而增大,吸附等温线结果表明Cu(Ⅱ)离子印迹聚合物对Cu(Ⅱ)离子的吸附服从Langmuir模型,最大吸附量分别为16.19 mg/g(25℃),17.14mg/g(35℃),19.33 mg/g(45℃).选择性试验的结果表明Cu(Ⅱ)离子印迹聚合物对Cu(Ⅱ)离子具有较好的选择识别能力,能够用于大多数金属离子共存时选择性吸附痕量Cu(Ⅱ)离子.

This expriment used methacrylic acid （MAA） as functional monomer, Cu （ 11 ） and 8-hydroxyquinoline formed the complexes as template molecule, EGDMA as crosslinkingagent, to synthesize the Cu （ II ） -8- hydroxyquinoline imprinted polymer by the W/O/W polymerization. It carried the quantitative and qualitative analysis of the adsorption Cu （ II ） on Cu （ II ）-liP by colorimetrie method and flame atomic absorption spectrophotometer. It studied the effect of pH, Kinetics, Adsorption isotherm and selectivity of Cu （ II）-liP, Optimum pH for maximum sorption was 7.0. Adsorption process reacheil the balance at 60 min,and adsorption kinetics can be described by Pseudo-Second-order kinetic. The adsorption capacity increased with temperature, indicating the process of the adsorption Cu （ II ） on Cu （ II ）-IIP was endothermic process. The result of adsorption isotherm showed that the adsorption model obeyed Langmuir adsorption model, and the maximum adsorption capacity were 16.19 mg/g （25℃ ） , 17.14 mg/g （35℃ ） 19.33 mg/g （45 ℃ ） , respectively. The experimental result indicated that Cu （ II） ions imprinted polymer to Cu （ II ） ion had good choice recognition ability, and can be used for most metal ion coexistence selective adsorption to trace Cu （ II ） ions.