Controllable cross‐linking of VA‐co‐VAm/PAN composite membranes for efficient pervaporation desalination under extreme pH conditions

• DOI: 10.1002/app.53928
• Publication Date: 2023-04-13T11:38:33Z
• Authors: Jiawen Fu; Haowei Pan; Mingzhe An; Zihao Li; Hong Wang; Xinping He; Chunhai Yi
• Keywords: Pervaporation; Glutaraldehyde; Polyvinyl Alcohol; Vinyl alcohol; Bacterial Cellulose

Abstract Polyvinyl alcohol (PVA) is a promising membrane material for pervaporation (PV) desalination. However, the adjustment and control of cross‐linking structure still challenge PVA membrane. In this study, novel pH‐resistant PVA‐based composite efficient desalination was developed by precisely adjusting behavior. Vinyl alcohol‐vinylamine copolymer (VA‐co‐VAm) containing both hydroxyl amino groups synthesized. Cross‐linking reaction carried out based on Schiff base between (in VAm moiety) glutaraldehyde (GA) under alkaline conditions. degree selective layer carefully controlled group content in copolymer. Results showed that prepared with VA‐co‐VAm 5 wt% N‐vinylformamide (NVF) displayed superior hydrophilicity largest free volume fraction. Pervaporation test indicated modified good stability extreme pH Specifically, strong acid conditions (pH ~ 1) 14), excellent performance water flux over 12 kg/(m 2 h), salt rejection higher than 99.95%. Based above results, offers platform conditions, which shows great potential industrial wastewater treatment.