剥离型膨润土对水中共存Pb^(2+)、Zn^(2+)、Cd^(2+)的吸附研究  

Adsorption of Pb^(2+),Zn^(2+),Cd^(2+)Coexisting in Water by Exfoliated Bentonite

作　　者：何春彦 莫伟 黄钰华 苏秀娟 封金鹏 He Chunyan;Mo Wei;Huang Yuhua;Su Xiujuan;Feng Jinpeng(School of Resources,Environment and Materials,Guangxi University,Nanning,Guangxi 530004)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004

出　　处：《非金属矿》2022年第6期80-85,共6页Non-Metallic Mines

基　　金：国家自然科学基金(51664001)。

摘　　要：为提高膨润土对水中共存重金属阳离子的吸附效果,采用物理方法对膨润土进行剥离处理后用于水中共存Pb^(2+)、Zn^(2+)、Cd^(2+)的吸附处理,考察了吸附时间、溶液初始质量浓度和溶液初始pH值对吸附效果的影响,并通过X射线衍射(XRD)、傅里叶红外光谱(FTIR)、X射线光电子能谱(XPS)等表征手段探究其对重金属离子的作用机制。结果表明,剥离处理有利于提高膨润土对水中Pb^(2+)、Zn^(2+)的吸附;在吸附剂为0.5 g,时间为10 min,溶液初始质量浓度为350 mg/L,体系pH值为5.14的条件下,剥离型膨润土对Pb^(2+)、Zn^(2+)、Cd^(2+)的最大吸附量可分别达到26.72 mg/g、16.44 mg/g、16.83 mg/g;剥离型膨润土对上述离子的吸附形式主要有离子交换作用、静电作用和表面配位作用。本研究为利用剥离型膨润土高效去除水中共存阳离子型重金属离子提供了新思路。In order to improve the adsorption effect of bentonite on coexisting cationic heavy metals in water,the bentonite was exfoliated by physical method and then was used for the adsorption treatment of coexisting Pb^(2+),Zn^(2+)and Cd^(2+)in water.In this paper,the effects of adsorption time,initial solution concentration and initial pH value on the adsorption effect were investigated,and the mechanism of its action on heavy metal ions was explored by XRD,FTIR and XPS.The results showed that the adsorption of Pb^(2+)and Zn^(2+)by bentonite could be improved through exfoliating treatment.Under the conditions of adsorbent dosage of 0.5 g,time of 10 min,initial concentration of 350 mg/L and pH value of 5.14,the maximum adsorption amount of Pb^(2+),Zn^(2+)and Cd^(2+)by exfoliated bentonite could reach 26.72 mg/g,16.44 mg/g,16.83 mg/g,respectively.The adsorption forms of the above ions by exfoliated bentonite mainly included ion exchange,static electricity and surface coordination.This Research provided a new idea for the efficient removal of cationic heavy metal ions in water by exfoliated bentonite.

关 键 词：剥离型膨润土 重金属离子 吸附 作用机制 

分 类 号：TQ424[化学工程]