Contra-diffusion synthesis of ZIF-8 layer on polyvinylidene fluoride ultrafiltration membranes for improved water purification

摘要

Contra-diffusion synthesis method was used to create a uniform layer of zeolitic imidazolate framework 8 (ZIF-8) on the porous polyvinylidene fluoride (PVDF) ultrafiltration membranes. SEM, FTIR, EDX, AFM and water contact angle analyses were used to characterize the prepared membranes. The modified membrane with 5 h contra-diffusion synthesis time showed maximum pure water flux of 134 L/m(2) h nearly twice of that of the bare PVDF membrane (65.8 L/m(2) h). The water purification performance of the prepared membranes was evaluated using dye removal efficiency and the ZIF-8 modified membranes exhibited better performance for dye removal due of the negatively charged surface. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.