Abstract
Polyvinylidene fluoride (PVDF) membranes were surface-modified via a simple coating method for improvement of the hydrophilicity performance. In this work, TP/PEI/PVDF modified membrane was successfully prepared by using tea polyphenol as a multifunctional coating. The physicochemical properties of membranes were characterized by Fourier transform infrared spectroscopy, X-ray energy-dispersive spectrometry, X-ray photoelectron spectroscopy scanning electron microscopy and atomic force microscopy. The water contact angle, pure water flux and methylene blue rejection ratio of membranes were investigated in detail. Compared with the pristine membrane, the water contact angle of the modified membrane decreased to 48.8°, and the rejection ratios were increased to 95.2% when the modified membrane was used to separate methylene blue. In addition, the modified membrane showed excellent antifouling performance in the experiment, and the flux recovery ratio still reached 84.6% after three fouling/washing cycles. In the oxidation experiment, the modified membranes were immersed in KMnO4 solution for 6 h, and the results show that the water contact angle, pure water flux and methylene blue rejection of the modified membranes only have changed slightly. Therefore, this study could have a great potential for widening the application of membranes in the treatment of dye wastewater containing oxidants.
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