EDTA-LDH/zeolite制备及其对重金属离子的吸附

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 370-382.

EDTA-LDH/zeolite制备及其对重金属离子的吸附

谢修鑫^{1, 2}, 廖立兵^{1, 2}, 雷馨宇^{1, 2}, 王丽娟^{1, 2}, 唐晓尉^{1, 2}

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;
2.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

收稿日期:2023-07-24 修订日期:2023-09-10 出版日期:2024-01-15 发布日期:2024-01-16
通信作者: 廖立兵,博士,教授。E-mail:clayl@cugb.edu.cn。
作者简介:谢修鑫(1998—),男,硕士研究生。主要从事黏土矿物的研究。E-mail:xiexiuxin19@163.com
基金资助:
国家自然科学基金重点项目(41831288)

Preparation of EDTA-LDH/Zeolite and Its Adsorption of Heavy Metal Ions

XIE Xiuxin^1,2, LIAO Libing^1,2, LEI Xinyu^1,2, WANG Lijuan^1,2, TANG Xiaowei^1,2

1. Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, School of Materials Science and Technology, China University of Geosciences Beijing, Beijing 100083, China;
2. Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, School of Materials Science and Technology, China University of Geosciences Beijing, Beijing 100083, China

Received:2023-07-24 Revised:2023-09-10 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

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。

关键词: LDH, 沸石, EDTA, 重金属离子, 吸附性能

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.

Key words: LDH, zeolite, EDTA, heavy metal ion, adsorption performance

中图分类号:

O647.3

谢修鑫, 廖立兵, 雷馨宇, 王丽娟, 唐晓尉. EDTA-LDH/zeolite制备及其对重金属离子的吸附[J]. 硅酸盐通报, 2024, 43(1): 370-382.

XIE Xiuxin, LIAO Libing, LEI Xinyu, WANG Lijuan, TANG Xiaowei. Preparation of EDTA-LDH/Zeolite and Its Adsorption of Heavy Metal Ions[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 370-382.

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