赤泥-聚丙烯酸-羧甲基纤维素水凝胶对水中Pb^(2+)吸附研究  

Adsorption Effect of Red Mud-Polyacrylic Acid-Carboxymethyl Cellulose Hydrogel on Pb^(2+)in Water

作　　者：付佳慧 王威[1,2,3] 邓华[1,2,3] 赵栋 张舒云[1,2,3] 叶顺云 胡乐宁[1,2,3] FU Jiahui;WANG Wei;DENG Hua;ZHAO Dong;ZHANG Shuyun;YE Shunyun;HU Lening(Guangxi Key Laboratory of Environmental Processes and Remediation in Ecologically Fragile Regions(Guangxi Normal University),Guilin Guangxi 541006,China;Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection(Guangxi Normal University),Ministry of Education,Guilin Guangxi 541006 China;College of Environment and Resources,Guangxi Normal University,Guilin Guangxi 541006,China)

机构地区：[1]广西生态脆弱区环境过程与修复重点实验室(广西师范大学),广西桂林541006 [2]珍稀濒危动植物生态与环境保护教育部重点实验室(广西师范大学),广西桂林541006 [3]广西师范大学环境与资源学院,广西桂林541006

出　　处：《广西师范大学学报（自然科学版）》2024年第5期150-162,共13页Journal of Guangxi Normal University:Natural Science Edition

基　　金：广西重点研发计划项目(GKAB22035038)。

摘　　要：为解决环境中重金属铅的污染问题,并对氧化铝冶炼中产生的工业固体废弃物赤泥进行妥当处置,本文以赤泥为原材料,通过聚合交联反应引入羧甲基纤维素钠(CMC)和丙烯酸(AA),制备得到吸附性能好、稳定性强和回收利用率高的赤泥-聚丙烯酸-羧甲基纤维素(RMAAC)复合水凝胶材料,将其作为吸附剂应用于水中Pb2+的吸附去除。结果表明,RMAAC对Pb2+的吸附主要归因于单分子层化学吸附,同时存在物理吸附,涉及的吸附机理有离子交换、官能团络合、阳离子-π和配位螯合作用。Langmuir模型计算得到的最大吸附量为730.16 mg/g,在pH为3~6时均具有较好的吸附性能。在多元重金属离子污染中,RMAAC展现出对Pb2+较高的选择性吸附能力。In order to solve the pollution of lead(Pb)in the environment and to properly dispose of red mud,an industrial solid waste generated in alumina oxide smelting.In this study,red mud was used as raw material,sodium carboxymethyl cellulose(CMC)and acrylic acid(AA)were introduced through polymerization and cross-linking reaction to prepare red mud-polyacrylic acid-carboxymethyl cellulose(RMAAC)composite hydrogel.It had adsorption performance,strong stability and high recycling rate,which were used as adsorbents for adsorption of Pb^(2+)in water.The adsorption of Pb^(2+)by RMAAC was mainly attributed to monomolecular layer chemisorption with the involvement of physisorption.The adsorption mechanisms may include ion exchange,functional group complexation,cation-πand ligand chelation.The maximum adsorption amount calculated by Langmuir model was 730.16 mg/g,and excellent adsorption properties within a broad pH range of 3 to 6.RMAAC showed high selective adsorption capacity for Pb^(2+)in the pollution of multiple heavy metal ions.

关 键 词：水凝胶 赤泥 复合材料 铅 吸附机理 选择性吸附 

分 类 号：X53[环境科学与工程—环境工程]