Preparation and Desalination Performance of MXene/CA Pervaporation Membrane
Pervaporation has received extensive attention due to its ability to treat high-concentration brine and nearly 100%salt rejection,but there is currently a problem of low flux.In order to solve this problem,MXene/CA mixed matrix membrane was prepared by solvent evaporation phase inversion method with cellulose acetate(CA)as continuous phase and MXene nanosheets as dispersed phase.The surface functional groups,microstructure,water contact angle and mechanical properties of the membranes were characterized by Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),water contact angle tester and precision universal material testing machine.The effects of MXene doping amount and NaCl aqueous solution concentration on membrane permeability were investigated.The results showed that the incorporation of MXene improved the permeability of the membrane.When the mass percentage of MXene was 4%,the water flux was 4.12 kg/(m2·h)when the NaCl aqueous solution with salt concentration of 35 g/L was treated at 50℃,which was 29.1%higher than that of pure CA membrane,and the salt rejection rate was as high as 99.9%.
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