坡缕石/羧甲基纤维素钠接枝甲基丙烯酸β-羟乙酯复合材料对Pb(Ⅱ)和Cu(Ⅱ)的选择性吸附  

Plygorskite/Cellulose Grafted 2-hydroxyethyl Methacrylate in Selectivity Adsorption for Pb(Ⅱ) and Cu(Ⅱ)

作　　者：陈潇琪 杨发翠 移永杰 常玥[1,2,3] 査飞 

机构地区：[1]西北师范大学化学化工学院,兰州730070 [2]生态环境相关高分子材料教育部重点实验室,兰州730070 [3]甘肃省高分子材料重点实验室,兰州730070

出　　处：《硅酸盐通报》2017年第2期668-674,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金资助项目(21161017)

摘　　要：以坡缕石(PGS)、羧甲基纤维素钠(CMC)、甲基丙烯酸β-羟乙酯(HEMA)、N,N-亚甲基双丙烯酰胺(MBA)为原料,利用"一锅法"制备了坡缕石/羧甲基纤维素钠接枝甲基丙烯酸β-羟乙酯(PGS/CMC-g-HEMA)复合材料。通过红外(FTIR)、热重(TG)、X-射线衍射(XRD)和扫描电镜(SEM)对材料的结构、外貌进行表征。考察了溶液pH值、初始浓度对该材料在吸附Pb(Ⅱ)、Cu(Ⅱ)混合溶液中两种金属离子吸附量的影响,从分配系数和分离因子角度对吸附选择性进行分析。实验结果表明,复合材料易吸附Pb(Ⅱ),在293 K、pH=5.0、初始浓度50 mg/L的混合溶液中,Pb(Ⅱ)的最大吸附量为32.4 mg/g;Pb(Ⅱ)的吸附动力学遵循准二级动力学模型,PGS/CMC-g-HEMA对Pb(Ⅱ)的吸附-解吸循环实验表明该材料具有较好的再生能力。The palygorskite/cellulose grafted 2-hydroxyethyl methacrylate composites（ PGS/CMC-gHEMA） were prepared using one pot-reaction by palygorskite,cellulose sodium（ CMC）,2-hydroxyethyl methacrylate（ HEMA） and N, N-methylene bisacrylamide（ MBA）. The composite material was characterized by FTIR,TG,XRD and SEM. The adsorptive properties of PGS/CMC-g-HEMA for Pb（ Ⅱ）and Cu（ Ⅱ） were evaluated in binary solutions using batch experiments as a function of solution pH,initial ion concentration. The adsorption selectivity was analyzed from partition coefficient and separation factor. The results indicated that the composites are easy to adsorb Pb（ Ⅱ） in binary solutions and the maximum adsorption capacity was 32. 4 mg/g at 293 K and pH 5. 0 when an initial concentration of Pb（ Ⅱ） and Cu（ Ⅱ） was 50 mg /L. Kinetic studies of Pb（ Ⅱ） revealed that adsorption data followed the pseudo-second-order kinetic model. Moreover,adsorption-desorption cycle of the composites for Pb（ Ⅱ）showed that PGS/CMC-g-HEMA could be regenerated successfully without significantly affecting itsadsorption efficiency.

关 键 词：坡缕石 羧甲基纤维素钠 复合材料 吸附 选择性 

分 类 号：TQ085.412[化学工程]