Issue 75, 2016, Issue in Progress

Hydrophilic modification of PVDF porous membrane via a simple dip-coating method in plant tannin solution

Abstract

To improve the hydrophilicity of polyvinylidene fluoride (PVDF) porous membranes, herein, we report for the first time a low-cost and environmental plant tannin coating, which is strongly constructed on the surface of the PVDF membrane via a simple dip-coating method. An oxidation induced aggregation mechanism was detected in the tannin solution through the use of ultraviolet spectrophotometry (UV-Vis). The morphology and chemical composition of the tannin coated PVDF membrane were characterized via field-emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). After coating with the tannin coating, hydrophilicity and filtration performance are both greatly enhanced, and the modified membranes also have a good emulsion separation performance and excellent antifouling property (after emulsion separation, the flux recovery ratio even reaches 100%). Moreover, these membranes possess outstanding durability that is disclosed by a long-term rinsing experiment. These results indicate that the plant tannin coating has great potential application for the hydrophilic modification of hydrophobic membranes.

Graphical abstract: Hydrophilic modification of PVDF porous membrane via a simple dip-coating method in plant tannin solution

Supplementary files

Article information

Article type
Paper
Submitted
26 May 2016
Accepted
09 Jul 2016
First published
11 Jul 2016

RSC Adv., 2016,6, 71287-71294

Hydrophilic modification of PVDF porous membrane via a simple dip-coating method in plant tannin solution

S. Zhang, L. Wu, F. Deng, D. Zhao, C. Zhang and C. Zhang, RSC Adv., 2016, 6, 71287 DOI: 10.1039/C6RA13634F

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