新型酰乙基葡甲胺树脂的合成及吸硼性能

采用一步法, 用氯乙酰化聚苯乙烯树脂(PS-Acyl-Cl)与葡甲胺反应制得一种同时含有α-酰乙基胺和邻羟基双官能团的新型酰乙基葡甲胺树脂, 考察了溶液pH值、 温度、 初始浓度和吸附时间对酰乙基葡甲胺树脂吸附硼的影响. 结果表明, 在实验浓度范围内, 该树脂对硼的吸附符合Langmuir方程, 最大吸附量约为28.1 mg/g干树脂, 优于氯甲基树脂制得的硼特效树脂. 表明α-酰乙基胺和邻羟基双官能团对硼有双重或协同吸附作用. 该树脂在pH=6.0时对硼的吸附量最大; 温度对树脂吸附的影响不大; 树脂解吸率大于96%; 树脂重复使用5次后吸附量基本不变. 动力学研究结果表明, 吸附过程为液膜扩散控制过程.

Synthesis of a New Acetyl-meglumine Resin and Its Adsorption Properties of Boron

A new acetyl-meglumine resin which contains α-acetyl-amine and orth-dihydroxy was directly synthesized by the reaction of chloroacetylated polystyrene resin(PS-Acyl-Cl) with meglumine. The boron adsorption behavior of the acetyl-meglumine resin was studied by varying different parameters, such as the pH value, temperature, the initial concentration of boron and the adsorption time. The experimental results showed that the adsorption behavior of the resin obeyed the Langmuir model equation within the range of experimental condition. And the maximum adsorption capacity could be up to 28.1 mg/g. The adsorption capacity of the acetyl-meglumine resin for boron was superior to the Boron Specific Resin that was synthesized by chloromethyl polystyrene resin. The high adsorption capacity showed that α-acetyl-amine and orth-dihydroxy had synergic adsorption of boron. It was found that the resin maintained the high capacity at pH=6.0 and the effect of temperature on resin adsorption was little. The resin desorption rate was more than 96%. After repeating 5 times, adsorption capacity for boron basically unchanged. The kinetics studies show that the dominant procedure of the adsorption is liquid film diffusion-controlled mechanism.