新型半纤维素基磁性水凝胶的制备及性能.pdf

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1、物理化学学报(WuliHuaxueXuebao)JanuaryActaP．-Chim．Sin．2014，30(1)，11l一120【Article】doi：10．3866／PKU．WHXB201310313、nnⅣ．whxb．pku．edu．Cll新型半纤维素基磁性水凝胶的制备及性能李亚婧孙晓锋叶青刘柏辰吴耀国(西北工业大学，空间应用物理与化学教育部重点实验室，西安710129)摘要：采用H：0．Vc氧化还原体系引发半纤维素衍生物，以表面修饰的Fe。O粒子作为磁性组分，利用接枝共聚方法制备了新型半纤维素基磁性水凝胶．分别用傅里叶变换EPI-(FTIR)光谱、X射线光电子能谱(XPS)和扫

2、描电子显微镜(SEM)对水凝胶的结构及形貌进行了表征，利用X射线衍射(XRD)~I：I振动样品磁强计(VSM)对水凝胶的晶型结构及磁性能进行了分析，发现Fe。O粒子均匀分散在凝胶网络中，半纤维素基磁性水凝胶表现出良好的顺磁性．考察了丙烯酸／半纤维素比例、Fes0粒子含量及交联剂用量对水凝胶溶胀性能的影响，并探讨了该水凝胶的溶胀机理，它在pH8缓冲溶液中的溶胀较好符合Fickian和Scho~动力学模型．通过SEM和溶胀性能分析表明，随着pH值的升高水凝胶的孔径增大，水凝胶的溶胀率逐渐增大．制备的水凝胶被用于溶菌酶吸附研究，结果表明磁性凝胶的吸附量大于非磁性水凝胶，水凝胶的吸附行为符合Fr

3、eundlich和Temkin等温模型．关键词：半纤维素：Fe。0：水凝胶：溶胀动力学：溶菌酶：吸附中图分类号：0648；0636．1PreparationandPropertiesofaNovelHemicellulose—BasedMagneticHydrogelLl、一JingSUNXiao—FengYEQingLIUBai-ChenWUYao-Guo(KeyLaboratoryofSpaceAppliedPhysicsandChemistry,MinistryofEducation，NorthwesternPolytechnicalUniversity,xinn710129,PR

4、．China)Abstract：HydrogelsareimportantfunctionaImaterialswithmanypotentialapplications．AnoveIhemicellulose—basedmagnetichydrogelwassynthesizedusingagraftcopolymermethod，withH202-Vcasaredoxinitiatorsystemtoinitiatethehemicellulosicderivativeandsurface—modifiedFe3O4particlesasthemagneticcomponent．Th

5、estructuresandmorphologiesofthepreparedmagnetichydrogelswereinvestigatedusingFourier-transforminfrared(FTIR)spectroscopy，X-rayphotoelectronspectroscopy(XPS)，andscanningelectronmicroscopy(SEM)．ThecrystalstructureofthemodifiedFe304particlesandthemagneticbehaviorsofthehemicellulose-basedmagnetichydr

6、ogelswereanalyzedusingX-raydifraction(XRD)andavibrationsamplemagnetometer(VSM)，respectively．TheresultsshowedthattheFe3o4particleswerewelIdispersedinthehydrogelmatrixandthepreparedhydrogelshadparamagneticproperties．Theefectsoftheacrylicacid／hemicelluloseratioandtheamountsofFe3O4particlesandcross．1

7、inkerontheswellingratioofthehydrogelswerestudied。andtheswellingmechanismofthehydrogelswasexplored．TheswellingbehaviorsofthehydrogelsweresimulatedusingFickianandSchofkineticmodelsinapH8bufersolution．Theporesizeandswelli