施氏矿物同时吸附磷酸根和Cd(Ⅱ)的研究  

Investigation of Simultaneous Adsorption of Phosphate and Cd (Ⅱ) on Schwertmannite

作　　者：朱雁平 傅浩洋 张江宏 Zhu Yanping;Fu Haoyang;Zhang Jianghong(Guangdong Provincial Key Laboratory of Agricultural and Rural Pollution Abatement and Environmental Safety,College of Natural Resources and Environment,South China Agricultural University,Guangdong,510642;Guangdong Provincial Key Laboratory of Mineral Physics and Materials,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangdong,510640;School of Materials Science and Engineering,Nanyang Technological University,Singapore,639798)

机构地区：[1]华南农业大学资源环境学院,广东省农业农村污染治理与环境安全重点实验室,广东510642 [2]中国科学院广州地球化学所,广东省矿物物理与材料研究开发重点实验室,广东510640 [3]南洋理工大学材料科学与工程学院,新加坡639798

出　　处：《当代化工研究》2022年第20期164-167,共4页Modern Chemical Research

摘　　要：目的:施氏矿物(Schwertmannite)是一种能显著影响污染物迁移过程的重要地质吸附剂。本文探究了施氏矿物在重金属离子和含氧阴离子同时存在条件下的吸附行为。方法:采用化学合成法制备施氏矿物,并通过批量吸附实验探究施氏矿物吸附磷酸根和Cd(II)的性能和机制。批量吸附实验分为两个体系:(1)施氏矿物单一吸附磷酸根或Cd(II);(2)施氏矿物共同吸附磷酸根和Cd(II)。同时,实验还探究了不同pH下施氏矿物共同吸附磷酸根和Cd(II)的性能。结果:实验表明施氏矿物对磷酸根和Cd(II)吸附效果都随着另一种污染物的加入呈现增强的趋势,表明磷酸根和Cd(II)在施氏矿物表面存在协同吸附效应。施氏矿物的等电点约为7.5。在pH范围为3~7时,pH能够显著地影响施氏矿物对磷酸根和Cd(II)的吸附。结论:通过批量实验和优化研究,磷酸根和Cd(II)在施氏矿物上的吸附能够互相促进,表明磷酸根和Cd(II)可能通过在施氏矿物形成三元络合物实现协同吸附效应。Objective:Schwertmannite is a significant geosorbent that remarkably affects the migration of pollutants.The present study investigates the adsorption performance of schwertmannite at the coexistence of heavy metal ions and oxygen anions.Method:Firstly,schwertmannite is synthesized based on the chemical synthesis method.Subsequently,batch adsorption experiments of phosphate and Cd (II) adsorption are conducted in the present study,which consists of two types:(1) Single adsorption of Cd(II) and phosphate on schwertmannite.(2) Simultaneous adsorption of Cd(II) and phosphate on schwertmannite.Meanwhile,the simultaneous adsorption performance of phosphate and Cd(II) is also probed at different pH conditions for schwertmannite.Result:The adsorption capacity of schwertmannite for phosphate or Cd(II) increases remarkably with the introduction of another pollutant,which reveals that the synergistic effect during adsorption of phosphate and Cd(II) by schwertmannite.The isoelectric point of schwertmannite is about 7.5.In addition,within the range of 3~7 pH significantly affects the adsorption of phosphate and Cd(II) on Schwertmannite.Conclusion:Through batch adsorption experiment,as well as optimization study,mutual promotion adsorption between phosphate and Cd(II) on the schwertmannite,are found in the present study,indicating that schwertmannite has synergistic effect for the adsorption of phosphate and Cd(II) via the formation of ternary complexes.

关 键 词：施氏矿物 磷酸根 CD(II) 吸附 协同作用 

分 类 号：X756[环境科学与工程—环境工程]