硅烷偶联剂改性高岭土对PVDF膜性能的影响研究  

Effect of silane coupling agent modified kaolinite addition on the performance of PVDF membrane

作　　者：朱志超[1,2] 朱小燕[1,2] 雷新荣[1,3] 

机构地区：[1]中国地质大学材料与化学学院,武汉430074 [2]中国地质大学教育部纳米矿物材料及应用工程研究中心,武汉430074 [3]中国地质大学(武汉)浙江研究院,武汉430074

出　　处：《膜科学与技术》2015年第6期9-15,共7页Membrane Science and Technology

基　　金：国家自然科学基金(41302032)

摘　　要：用硅烷偶联剂(APTES)表面改性的高岭土作为添加剂,共混到聚偏氟乙烯(PVDF)中制备出高岭土/PVDF复合膜,利用X衍射仪(XRD)和傅里叶变换红外光谱仪(FTIR)对膜进行物相与化学基团的分析,利用电场枪电子扫描电子显微镜(FESEM)观察膜表面与断面的形态结构.通过测试膜的亲水接触角、膜通量、蛋白质截留率、通量恢复率等,研究改性高岭土的添加对PVDF复合膜性能的影响.结果表明,复合膜结晶形式主要是β晶型,含有少量的α晶型.随着改性高岭土的增加,膜的亲水接触角由72°降到64°,亲水性逐渐增强;膜的纯水通量、通量恢复率都随改性高岭土增加先增大后减小,复合膜纯水通量在高岭土质量分数为0.75%达到最大时,由原膜的250L/(m2·h)提高到528L/(m2·h),通量恢复率也由原膜的50%提高到81%.Polyvinylidene fluoride（PVDF）has a poor hydrophilicity and can be easily polluted.To solve this problem,silane coupling agent（APTES）was added into kaolinite,and a blending method was used to prepare the modified kaolinite/PVDF composite membrane.XRD and FTIR were used to analyze the crystal phase and chemical group of the composite membrane.The morphologies of the membrane surface and cross-section were observed by FESEM.The contact angle,pure water flux and water flux recovery were used to find out the effect of modified kaolinite addition on the properties of PVDF membrane.The results showed that the composite membrane was constituted of mainlyβ-crystal and a small mount ofα-crystal.The water contact angle of the membrane decreased from 72°to 64°with increasing modified kaolinite and its hydrophilicity enhanced gradually.The increasing of content of modified kaolinite increased the pure water flux and flux recovery ratio at first and then decreased.The composite membrane with a kaolinite mass fraction of 0.75% had a highest water flux and increased from 250L/（m2·h）of primary membrane to 528L/（m2·h）.The flux recovery ratio increased from 50%to 81%.

关 键 词：高岭土 APTES PVDF膜 水处理 

分 类 号：TQ051.893[化学工程]