Abstract
Ultrafiltration membranes are widely used for the treatment of papermaking wastewater. The antifouling performance of polyvinylidene fluoride (PVDF) ultrafiltration membranes can be improved by changing the hydrophilicity. Here, a novel amphiphilic copolymer material, PVDF grafted with N-isobutoxy methacrylamide (PVDF-g-IBMA), was prepared using ultraviolet-induced Cu(II)-mediated reversible deactivation radical polymerization. The amphipathic copolymer was used to prepare ultrafiltration membrane via NIPS. The prepared PVDF-g-IBMA ultrafiltration membrane was estimated using 1H NMR, FT-IR, and DSC. The contact angle, casting viscosity, and the permeation performance of the PVDF-g-IBMA ultrafiltration membrane were also determined. The pure water flux, bovine serum albumin removal rate, and pure water flux recovery rate of the PVDF-g-IBMA ultrafiltration membrane were 432.8 L·m-2·h-1, 88.4%, and 90.8%, respectively. Furthermore, for the treatment of actual papermaking wastewater, the chemical oxygen demand and turbidity removal rates of the membrane were 61.5% and 92.8%, respectively. The PVDF-g-IBMA amphiphilic copolymer ultrafiltration membrane exhibited good hydrophilicity and antifouling properties, indicating its potential for treating papermaking wastewater.
Highlights
Water shortage is a major crisis affecting human health and sustainable economic and social development
The flux, alginate rejection rate, and water flux recovery rate of the membrane were 700 L·mÀ2·hÀ1, 87%–100%, respectively, indicating the good antifouling of the membrane. These findings indicate that amphiphilic polymers can be used to improve the hydrophilic properties of polyvinylidene fluoride (PVDF) Ultrafiltration membrane (UF) membranes
Fourier-transform infrared Spectrometer (FTIR) spectroscopy was carried out to verify the synthesis of PVDF-g-IMBA copolymer UF membrane
Summary
Water shortage is a major crisis affecting human health and sustainable economic and social development. PVDF membranes containing materials with hydrophilic groups exhibit a higher water transfer rate and lower filtration resistance than pure PVDF membranes, indicating their potential as high-performance separation membranes (Liu et al 2011; Park et al 2018; Matyjaszewski 2020). The flux, alginate rejection rate, and water flux recovery rate of the membrane were 700 L·mÀ2·hÀ1, 87%–100%, respectively, indicating the good antifouling of the membrane These findings indicate that amphiphilic polymers can be used to improve the hydrophilic properties of PVDF UF membranes. The water flux and BSA rejection rate of the PVDF-g-NMA copolymer UF membrane were 272.1 L·mÀ2·hÀ1 and 92.6%, respectively. We suppose the novel developed PVDF-g-IBMA membrane exhibits better hydrophilicity and antifouling properties than PVDF UF membranes, indicating its prospect for the treatment of papermaking wastewater
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