EDTA-LDH/zeolite制备及其对重金属离子的吸附
Preparation of EDTA-LDH/Zeolite and Its Adsorption of Heavy Metal Ions
谢修鑫 1廖立兵 1雷馨宇 1王丽娟 1唐晓尉1
作者信息
- 1. 中国地质大学(北京)材料科学与工程学院,非金属矿物与固废资源材料化利用北京市重点实验室,北京 100083;中国地质大学(北京)材料科学与工程学院,地质碳储与资源低碳利用教育部工程研究中心,北京 100083
- 折叠
摘要
用水热法和焙烧还原法两步合成了乙二胺四乙酸-水滑石/沸石(EDTA-LDH/zeolite)复合材料,并将其用于去除水溶液中的Cd2+、Pb2+、Cu2+,系统研究不同条件下EDTA-LDH/zeolite对单一及混合重金属离子溶液中Cd2+、Pb2+、Cu2+的吸附效果与吸附机制.结果表明,当EDTA-LDH/zeolite投加量为0.05 g、重金属离子浓度为1 500 mg/L、pH值为6.5、吸附时间为24 h时,EDTA-LDH/zeolite吸附性能最佳.重金属离子间存在竞争吸附,EDTA-LDH/zeolite对Cd2+、Pb2+、Cu2+的最大吸附容量分别为65.33、98.35和108.51 mg/g.去除过程中沉淀作用、表面络合、螯合反应等多种机制协同作用,去除行为均符合Langmuir等温模型与拟二阶动力学模型.
Abstract
EDTA-LDH/zeolite composite material was synthesized in two steps by hydrothermal and reconstruction method and used for the removal of Cd2+,Pb2+,and Cu2+from aqueous solution.The adsorption effect and mechanism of EDTA-LDH/zeolite on Cd2+,Pb2+and Cu2+in single and mixed heavy metal ion solutions under different conditions were systematically investigated.The results show that the best adsorption performance of EDTA-LDH/zeolite is achieved when the dosage of EDTA-LDH/zeolite is 0.05 g,the concentration of heavy metal ions is 1 500 mg/L,the pH value is 6.5,and the adsorption time is 24 h.Competing adsorption between heavy metal ions,the maximum adsorption capacities of EDTA-LDH/zeolite for Cd2+,Pb2+,and Cu2+are 65.33,98.35,and 108.51 mg/g,respectively.During the removal process,various mechanisms such as precipitation,surface complexation,and chelation work synergistically.The removal behavior of EDTA-LDH/zeolite are all consistent with Langmuir isotherm model and pseudo second-order kinetic model.
关键词
LDH/沸石/EDTA/重金属离子/吸附性能Key words
LDH/zeolite/EDTA/heavy metal ion/adsorption performance引用本文复制引用
基金项目
国家自然科学基金重点项目(41831288)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据