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.
出处
《化工新型材料》
CAS
CSCD
北大核心
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)
作者简介
张敏（1972-），男，讲师，研究方向：天然高分子。
联系人：陈良壁，教授，研究方向：功能高分子。
