聚丙烯酸/壳聚糖复合多孔冷冻凝胶制备及其对亚甲基蓝吸附研究  

Fabrication of IPN-poly(acrylamide)/chitosan composite macroporous cryogels and adsorption of methylene blue

作　　者：张敏[1] 李碧婵[1] 陈良壁[1] 

机构地区：[1]福建省高校绿色化工技术重点实验室,武夷学院生态与资源工程学院,武夷山354300

出　　处：《化工新型材料》2014年第12期166-168,171,共4页New Chemical Materials

基　　金：福建省自然科学基金(2012N0027);福建省教育厅JK类项目(JK2012055);南平市科技局项目(N2012Z06(6));国家大学生创新性实验(201210397003);武夷学院基金(JB05194)

摘　　要：以壳聚糖(CS)为基底,丙烯酰胺(AAm)为单体,N,N’-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸铵(APS)和四甲基乙二胺(TMEDA)为引发体系,在-18℃条件下,通过冷冻聚合方法制备半-IPN-PAAm/CS复合多孔冷冻凝胶,用环氧氯丙烷交联壳聚糖得到IPN-PAAm/CS复合多孔冷冻凝胶。扫描电镜表明制备的孔为相互贯穿的连通孔,孔径大小为25±7μm。IPN-PAAm/CS-3、IPN-PAAm/CS-2和IPN-PAAm/CS-1平衡溶胀比分别为31.4、27.4和22.4g/g。IPN-PAAm/CS-3复合多孔冷冻凝胶对亚甲基蓝平衡吸附容量为712.80mg/g。分别采用拟一级、拟二级和粒内扩散模型拟合实验数据,结果表明:拟二级和拟一级符合该实验体系,多孔冷冻凝胶对亚甲基蓝的吸附以化学吸附为主,同时伴随静电吸附。Semi-IPN-poly（acrylamide）/chitosan（PAAm/CS）composite macroporous cryogels were synthesized by freezing polymerization of acrylamide as monomer,N,N＇-methylene bisacrylamide as crosslinker,ammonium persulfate（APS）and tetramethylethylenediamine（TMEDA）as initiating system in aqueous solution of chitosan at-18 oC.Semi-IPNPAAm/CS composite macroporous cryogels were transformed into IPN-PAAm/CS composite macroporous cryogels by crosslinking of CS using epoxy chloropropane.Inter-connected pores with diameter of 25±7μm were observed by SEM.The equilibrium swelling ratio of IPN-PAAm/CS-3,IPN-PAAm/CS-2and IPN-PAAm/CS-1were 31.4,27.4and 22.4g/g.The equilibrium adsorption capacity of IPN-PAAm/CS-3for methylene blue adsorption was 712.80mg/g.The adsorption data followed the pseudo first-order kinetic model,pseudo second-order kinetic model and Intraparticle diffusion model.The adsorption process was more according with pseudo second-order kinetic model and pseudo first-order kinetic model indicated that chemical adsorption was dominant and accompanied by electrostatic adsorption.

关 键 词：壳聚糖 聚丙烯酰胺 冷冻凝胶 多孔 吸附 

分 类 号：O648.17[理学—物理化学]