镓印迹树脂合成及其在铝土矿溶出液中的吸附性能
Synthesis of gallium imprinted resin and its adsorption performance in bauxite leaching solution
刘平 1吕国志 1张廷安 1杨超 1王松1
作者信息
- 1. 东北大学冶金学院,辽宁沈阳 110819
- 折叠
摘要
针对目前镓提取效率低的问题,本研究以壳聚糖为载体,通过戊二醛的交联反应,接枝丙烯酸功能单体,同时结合离子印迹技术,合成了对镓具有良好吸附性能的镓印迹壳聚糖树脂,并借助FT-IR光谱和扫描电镜表征树脂表面的官能团和形貌,通过吸附试验研究了该合成树脂在模拟溶出液中的吸附动力学过程,溶液pH及竞争离子对树脂吸附性能的影响,及合成树脂的重复利用性.结果表明,镓印迹树脂表面形成粗糙多孔的结构;该树脂对镓的吸附符合准二级动力学模型和Langmuir吸附等温模型,吸附过程是以化学吸附控制为主的单分子层吸附,饱和吸附容量为16.28 mg·g-1;该树脂的最佳使用pH值范围为5～7;镓相对于钒和铝的选择性系数分别为12.50和9.87,表现出较好的镓吸附性能;该树脂在吸附和解吸循环重复七次后,吸附容量依旧保持在原来的80％,具有较好的重复利用效果.
Abstract
To address the low efficiency of gallium extraction,the present study synthesized a gallium-imprinted chitosan resin with good adsorption performance for gallium by using chitosan as the carrier,grafting acrylic functional monomers through cross-linking of glutaraldehyde and combining with ion-imprinting technology,and characterized the functional groups and morphology on the surface of the resin with the help of FT-IR spectroscopy and scanning electron microscopy,studied the adsorption kinetic process of the synthesized resin in simulated dissolution solution by adsorption tests,and investigated the reusability of the synthetic resin.The adsorption kinetic process of the synthetic resin in the simulated dissolution solution,the effects of solution pH and competing ions on the adsorption performance of the resin,and the reusability of the synthetic resin were investigated by adsorption tests.The results showed that the surface of the gallium-imprinted resin formed a rough and porous structure;the adsorption of gallium by the resin conformed to the quasi-secondary kinetic model and the Langmuir adsorption isothermal model,and the adsorption process was a monomolecular layer adsorption mainly controlled by chemical adsorption,with the saturated adsorption capacity of 16.28 mg·g-1;the optimal use of this resin was in the pH range of 5～7;the adsorption selectivity of gallium for vanadium and aluminum was higher than that of gallium for the simulated dissolution solution.The optimal pH range of the resin was 5～7;the selectivity coefficients of gallium relative to vanadium and aluminum were 12.50 and 9.87,respectively,which showed better gallium adsorption performance;the adsorption capacity of the resin remained at 80％of the original capacity after repeating the adsorption and desorption cycles for seven times,which had a good reuse effe.
关键词
镓提取/铝土矿溶出液/壳聚糖/物理化学改性/离子印迹技术/选择性吸附/吸附模型/重复利用性Key words
gallium extraction/bauxite leachate/chitosan/physicochemical modification/ion blotting technique/selective adsorption/adsorption model/reusability引用本文复制引用
出版年
2024
NETL
NSTL
万方数据