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硅烷偶联剂改性高岭土对PVDF膜性能的影响研究

作者：朱志超¹， ²，朱小燕¹，²，，雷新荣¹，³

单位： 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

关键词：高岭土，APTES，PVDF膜，水处理

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2015,35(6):9-15

摘要：

聚偏氟乙烯（PVDF）因其优异的力学、化学、耐热等性能，已成为应用最广泛的聚合物膜材料之一,但其亲水性较差、易污染。针对这些缺陷，本文用硅烷偶联剂（APTES）表面改性的高岭土作为添加剂，共混到PVDF中制备出高岭土/PVDF复合膜，利用XRD和FTIR对膜进行物相与化学基团的分析，利用FESEM扫描电镜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含量为0.75 wt%达到最大，由原膜的250L/(m2h)提高到528 L/(m2h)，通量恢复率也由原膜的50 %提高到81 %。

Polyvinylidene fluoride(PVDF) is one of the most widely used polymer membrane materials due to its excellent properties on mechanical, chemical and thermal stability, but it has poor hydrophilicity and can be easily polluted. To solve this problem, silane coupling agent (APTES) was added into kaolinite, and 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 constituted mainly β-crystal and a small mount of α-crystal. The water contact angle of membrane decreased from 72° to 64° with increasing modified kaolinite, 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 the content of 0.75 wt% had a highest water flux kaolinite and increased from 250 L/(m2h) of primary membrane to 528 L/(m2h). The flux recovery ratio increased from 50 % to 81%.

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参考文献：

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