膨润土基共聚复合物的制备及对亚甲基蓝的脱色性能  

Preparation of bentonite-copolymer composite and its decolorizing performances in removing methylene-blue

作　　者：何玉凤[1] 王燕[1] 张振花[1] 王荣民[1] 何文娟[1] 黄一君[1] 

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

出　　处：《环境化学》2013年第8期1554-1559,共6页Environmental Chemistry

基　　金：国家自然科学基金(21263024;21161017;21244003);甘肃省高等学校研究生导师科研项目(1201-15)资助

摘　　要：将乙酸乙烯酯、马来酸酐和丙烯酸作为功能性单体,在钠基膨润土分散体系中进行原位共聚反应,制备了一种膨润土基共聚复合物(P(MAVM)/NaB),采用FT-IR、XRD、SEM等手段对其结构进行了表征.结果表明,NaB与共聚物均匀复合,其中部分高分子链进入了膨润土层间,扩大了缝隙.将膨润土基共聚复合物用于染料亚甲基蓝(MB)的吸附,考察了影响膨润土基共聚复合物吸附亚甲基蓝的主要因素.结果表明:25℃,吸附剂用量为0.1 g.L-1,振荡5 min,MB初始浓度为20 mg.L-1的条件下,MB脱色率可达97.7%,吸附容量达195.46 mg.g-1.处理后水样的色度达到国家污水综合排放一级标准.同时研究了吸附机理,结果发现:吸附过程符合准二级动力学模型,MB通过电中和、氢键及范德华力作用被P(MAVM)/NaB吸附.Using sodium bentonite as carriers,a bentonite-copolymer composite（P（MAVM） / NaB） was successfully prepared by in-situ polymerization of functional monomers,maleic anhydride,acrylic acid and vinyl acetate.The structure of P（MAVM） / NaB was characterized by FT-IR,XRD and SEM.It indicated that the copolymer chains were partly inserted into layers of bentonite,and enlarged its gap.The bentonite-copolymer composite was applied to remove methylene blue（MB）,a typical cationic dye.Some important influencing factors on removing MB by bentonite-copolymer composite were investigated.The optimum adsorption conditions were obtained as following： the bentonite-copolymer composite dosage is 0.1 g.L-1,initial concentration of MB is 20 mg.L-1,5 min reaction at room temperature（25℃）.The removal rate of MB reached 97.7%,and the adsorption capacity of bentonite-copolymer composite was up to 195.46 mg.g-1.The chromaticity color of effluent met the Class I of National Intergated Wastewater Discharge Standard.Its adsorption mechanism was also investigated.It was found that the adsorption process was consistent with quasi-secondorder kinetic dynamic equation.It is suggested that MB was adsorbed to P（MAVM） / NaB by charge neutralization,hydrogen bond and vander waals force.

关 键 词：膨润土基共聚复合物 亚甲基蓝 脱色性能 吸附动力学 吸附机理 

分 类 号：X703[环境科学与工程—环境工程]