Synthesis and characterization of PVA/PES thin film composite nanofiltration membrane modified with TiO₂ nanoparticles for better performance and surface properties

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• 作者：Sarah Pourjafar ; Ahmad Rahimpour ^{ahmadrahimpour@nit.ac.ir} ; Mohsen Jahanshahi ; ^{mmohse@yahoo.com} ; ^{mjahan@nit.ac.ir} ;
• 关键词：Nanofiltration ; PVA/PES composite membrane ; Modification ; TiO2 nanoparticles
• 刊名：Journal of Industrial and Engineering Chemistry
• 出版年：2012
• 期刊代码：P29_1226086x
• 类别：ce
• 出版时间：25 July, 2012
• 卷：18
• 期：4
• 页码：1398-1405
• 文件大小：1559 K

摘要

Novel polyethersulfone (PES)/poly (vinyl alcohol) (PVA)/titanium dioxide (TiO₂) composite nanofiltration membranes were prepared by dip-coating of PES membrane in PVA and TiO₂ nanoparticles aqueous solution. Glutaraldehyde (GA) was used as a cross-linker for the composite polymer membrane in order to enhance the chemical, thermal as well as mechanical stabilities. TiO₂ nanoparticles with different concentrations (0, 0.05, 0.1, 0.5 wt.%) were coated on the surface of PVA/PES composite membrane. The morphological study was investigated by atomic force microscopy (AFM), scanning surface microscopy (SEM) and along with X-ray diffraction (XRD). In addition, the membranes performances, in terms of permeate flux, ion rejection and swelling factor were also investigated. It was found that the increase in TiO₂ solution concentration can highly affect the surface morphology and filtration performance of coated membranes. The contact angle measurement and XRD studies indicated that the TiO₂ nanoparticles successfully were coated on the surface of PVA/PES composite membranes. However, rougher surface was obtained for membranes by TiO₂ coating. The filtration performance data showed that the 0.1 wt.%TiO₂-modified membrane presents higher performance in terms of flux and NaCl salt rejection. Finally, TiO₂ modified membranes demonstrated the lower degree of swelling.