Fabrication and performance of maltitol-based polyester composite nanofiltration membrane
Loose nanofiltration membranes with excellent dye/salt selective separation are expected to fulfill the urgent need for dye/salt mixture separation in textile wastewater treatment.In this study,Maltitol with abundant hydroxyl groups was used as a novel aqueous monomer,and Maltitol/TMC loose nanofiltration membrane with high dye/salt selectivity and high water permeance was fabricated by interfacial polymerization(IP)with trimesoyl chloride(TMC)on the surface of polyethersulfone(PES)ultrafiltration membranes for the excellent separation of dye/salt mixed solutions.The performance of the membranes was optimized by adjusting the concentration of Maltitol,and the optimized membranes had water permeance of 800.1 L/(m2·h·MPa),with dyes rejection to 99.3％,95.1％and 97.2％for Congo red(CR),Direct red 23(DR 23)and Eriochrome black T(EBT),the rejection of Na2SO4 and NaCl were only 10.3％and 4.4％,respectively.The optimized membranes showed flux recovery ratio(FRR)of around 90％for all three dyes,and good long-term stability for the mixed salt/dye solutions.The new maltitol-based nanofiltration membrane has excellent application prospects in textile wastewater treatment.
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