膜科学与技术

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Preparation of PVDF/SiC hydrophobic/hydrophilic Janus composite membrane and its performance in the treatment of acidic wastewater by membrane distillation

Authors： JIAN Kejie, FANG Minfeng, WU Xin, LI Jun, SUN Yiran, RAO Pinhua, LI Guanghui

Units： 1. Innovation Center for Environment and Resources, College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; 2. Petroleum and Chemical Industry Key Laboratory of Silicon Carbide Ceramic Membrane, Shanghai University of Engineering Science, Shanghai 201620, China; 3. Zhejiang Motonghuihai Technology Development Co., Ltd., Huzhou 313000, China

KeyWords： Janus composite membrane; silicon carbide microfiltration membrane; poly(vinylidene fluoride); non-solvent induced phase separation; direct contact membrane distillation; acidic wastewater

ClassificationCode：TQ028.3; TQ09; X703.1

year,volume(issue):pagination： 2024,44(4):157-169

Abstract：

This article focuses on the treatment and resource reuse of acidic wastewater using direct contact membrane distillation (DCMD) technology. In response to the problems of low mechanical stability and low flux of traditional distillation membranes, a hydrophobic polyvinylidene fluoride (PVDF) porous thin layer was constructed on the surface of hydrophilic silicon carbide (SiC) microfiltration membrane using tape casting and non-solvent induced phase separation (NIPS) methods, and a PVDF/SiC hydrophobic/hydrophilic bilayer Janus composite membrane with asymmetric wettability was prepared for the study of its performance in DCMD. Using N, N-dimethylacetamide (DMAc) as the solvent and a water-ethanol system as a non-solvent coagulation bath, the effects of factors during the membrane preparation process such as PVDF casting solution concentration, the coagulation bath composition, and the coagulation bath temperature on the surface morphology and wetting properties of the PVDF layer were investigated. The performance of the composite membrane in concentrating dilute sulfuric acid and treating synthetic mine drainage by DCMD were studied. The results show that the optimal fabrication conditions are 10% PVDF casting solution by weight and pure ethanol as coagulation bath. The resulting composite membrane had a water contact angle of 140°, a separation layer porosity of 45%, an average pore size of 0.6 μm, and a strong adhesion between the PVDF layer and the SiC support. Using the composite membrane in DCMD, the permeation flux of water in the concentration of 10% by weight (107 g/L) dilute sulfuric acid solution and the treatment of synthetic mine drainage both reached above 10 L/(m2?h), and the rejection rate of non-aqueous components both reached nearly 100% as well. It also showed long-term operational stability, demonstrating potential application for treating acidic wastewater by DCMD.

Funds：

国家自然科学基金青年项目（22306025）；上海市地方院校能力建设项目（21010501400）；上海市“科技创新行动计划”启明星项目（扬帆专项）（23YF1415400）。

AuthorIntro：

菅珂婕（1998-），女，河南省商丘人，硕士研究生，研究方向为膜材料和膜分离技术；E-mail：18339186637@163.com

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