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Journal of Membrane Science-A facile strategy to enhance PVDF ultrafiltration membrane performance via self-polymerized polydopamine followed by hydrolysis of ammoniumfluotitanate
来源:王振兴副教授个人网站 发布日期:2017-06-10
作者:Lu Shao , Zhen Xing Wang, Yong Ling Zhang, Zai Xing Jiang, Yu Yan Liu
关键字:PVDF, Ultrafiltration, Modification, TiO2, Hydrophilicity
论文来源:期刊
具体来源:Journal of Membrane Science
发表时间:2014年

In this study, to overcome the inherent hydrophobicity and improve the comprehensive performance of

polyvinylidenefluoride (PVDF) ultrafiltration (UF) membranes, hydrophilic TiO2particles were utilized

to modify PVDF UF membranes. To obtain the strong binding force and homogenous TiO2distribution on

PVDF UF membranes, polydopamine (pDA) as the“bio-glue”was architecturally built between TiO2and

PVDF membranes, and the modification process was facilely designed via self-polymerization of

dopamine and subsequent hydrolysis of ammoniumfluotitanate. Water contact angle tests proved the

significant improvement in the hydrophilicity of PVDF membranes after modification. The morphologies

of various membranes before and after modification were investigated by scanning electron microscopy

(SEM) and atomic force microscopy (AFM) and the chemical reactions during different modification

stages were evaluated by X-ray photoelectron spectroscopy (XPS) tests. It was found that the pDA layer

via self-polymerization of dopamine on PVDF membranes could assist TiO2 to tightly and homogeneously bind onto PVDF surface for improving the stability and anti-fouling property of membranes

because of the coordination bond (C–OTi) formed between TiO2and pDA, and the pore sizes of PVDF

membranes obviously decreased after modifications. The possible mechanisms during modifications

were discussed. The comprehensive properties of PVDF membranes after such facile modifications had

been greatly enhanced according to the results of waterflux, bovine serum albumin (BSA) rejection, antifouling performance, and TiO2 binding performance characterizations. Both the waterflux and BSA

rejection could be simultaneously improved at the optimized hydrolysis time. Furthermore, the static

and dynamic BSA adsorption tests were carried out. Interestingly, the amounts of BSA adsorption onto

modified membranes demonstrated the opposite trends for the static and dynamic BSA adsorption tests.

The possible reason was clarified based on the competition between the improved hydrophilicity and the

adsorption ability of TiO2. Therefore, TiO2 modified PVDF UF membranes developed by this novel

strategy have attractive potential for water environmental remediation


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