Effect of Nano-TiO2 Particles on the Performance of PVDF, PVDF-g-(Maleic anhydride), and PVDF-g-Poly(acryl amide) Membranes

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• 作者：Xiaokai Bian ; Liuqing Shi ; Xuanxuan Yang ; Xiaofeng Lu
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：November 2, 2011
• 年：2011
• 卷：50
• 期：21
• 页码：12113-12123
• 全文大小：1071K
• 年卷期：v.50,no.21(November 2, 2011)
• ISSN：1520-5045

文摘

To study the effects of nano-TiO₂ particles on membrane performance and structure and to explore possible interactions between nano-TiO₂ particles and polymer, polymer/TiO₂ embedded hybrid membranes and neat polymer membranes were prepared using the phase inversion method. Poly(vinylidene difluoride) (PVDF), poly(vinylidene difluoride)-g-(maleic anhydride) (PVDF-g-MA), and poly(vinylidene difluoride)-g-poly(acryl amide) (PVDF-g-PAM) were selected as the membrane materials. SEM images showed that the hybrid membranes had a thinner skin layer and a larger number of pores in the sublayer than the neat membranes, which was the main cause of the increase in water flux of the hybrid membranes. They also exhibited a better antifouling property than the neat ones in the continuous BSA solution filtration process. In the 48-h-long pure-water experiment, the hybrid membranes underwent a water flux decline and an increase in contact angle. The loss of nano-TiO₂ particles, revealed by EDS analysis, influenced the stability of hybrid membrane performance. The XPS analysis suggested that nano-TiO₂ particles were immobilized in the membrane surface layer through the formation of a stable chemical structure resulting from its reaction with polymer and/or through intertwining with polymer chains.