多孔壳聚糖接枝聚丙烯酸/钠基蒙脱土复合高吸水凝胶的制备及其对Pb^(2+)的吸附  

Preparation of Porous Chitosan-graft-poly( acrylic acid) /Na-montmorillonite Superabsorbent Composite and Its Absorption Performance for Pb^(2+)

作　　者：常艳红[1] 董晓宁[1] 

机构地区：[1]天水师范学院化学工程与技术学院,甘肃天水741001

出　　处：《应用化学》2015年第6期623-628,共6页Chinese Journal of Applied Chemistry

基　　金：天水师范学院中青年科研项目(TSB1106)资助~~

摘　　要：以十二烷基苯磺酸钠(SDS)胶束为孔模板,过硫酸铵(APS)引发,N,N'-亚甲基双丙烯酰胺(MBA)交联,壳聚糖(CS)与丙烯酸(AA)、钠基蒙脱土(Na-MMT)在水溶液中接枝共聚,成功制备了多孔壳聚糖接枝聚丙烯酸/钠基蒙脱土(CS-g-PAA/Na-MMT)复合高吸水凝胶,提出了SDS胶束致孔机理。扫描电子显微镜(SEM)分析表明,添加SDS的样品,凝胶表面出现多孔结构。通过考察SDS浓度对复合高吸水凝胶平衡吸水倍率和吸水速率的影响,发现当SDS浓度为1.5 mmol/L时,复合凝胶在蒸馏水和生理盐水中的平衡吸水倍率相对于空白样分别提高53.9%和35.3%,初始溶胀速率常数Kis也由空白样的1.2652 g/(g·s)提高到5.1680 g/(g·s)。多孔结构也使复合凝胶对Pb2+的吸附速率加快,在10 min内即可达到饱和吸附量的95%,30 min完全达到吸附平衡。Using the self-assembled anionic surfactant sodium n-dodecyl sulfonate（ SDS） micelles as porous templates, a novel porous chitosan-graft-poly（ acrylic acid）/Na-montmorillonit（ CS-g-PAA/Na-MMT）superabsorbent composite was successfully prepared by grafting copolymerization of chitosan（ CS）,acrylic acid（AA） and Na-montmorillonite（ Na-MMT）,using ammonium persulfate（ APS） as the initiator and N,N＇-methylenebisacrylamide（ MBA） as the crosslinker. The mechanism for this reaction was proposed. Scanning electron microscope（ SEM） analysis demonstrated that the morphologies of the SDS-added sample displays homogeneous and well-defined porous structures. Effect of SDS concentration on the equilibrium swelling ratio and swelling rate of the hydrogels were evaluated. The results show that the equilibrium swelling ratio of the1. 5 mmol/L SDS sample in distilled water and 0. 9% mass fraction of Na Cl solution are improved to 53. 9%and 35. 3%,respectively. Compared to the sample without SDS,the initial swelling rate constant,Kis,is also improved from 1. 2652 g /（ g·s） to 5. 1680 g /（ g·s）. In addition,the porous structure can accelerate the adsorption rate for Pb^2 ＋,which reaches the 95% saturation adsorption capacity during the initial 10 min,and achieves adsorption equilibrium within 30 min.

关 键 词：壳聚糖 蒙脱土 多孔高吸水凝胶 溶胀性能 铅离子吸附 

分 类 号：O636.1[理学—高分子化学]