Anti-fouling modification of hollow fiber nanofiltration membrane based on tannic acid
Aiming at the problem of nanofiltration membrane fouling,tannic acid rich in phenolic hydroxyl groups was used to graft modify the surface of polyamide nanofiltration membrane to construct an anti-fouling layer rich in phenolic hydroxyl groups.The effect of tannic acid concentration on the grafting effect were investigated.The modified membranes were characterized by Fourier transform infrared spectrometer,Zeta potential and water contact angle tester.The results showed that when the concentration of tannic acid was 0.15％,the flux decay rate was the lowest,which was 5.05％,and the steady-state membrane flux was the highest,which was 97.8 L/(m2·h·MPa).The flux recovery rate reached 98.1％after simple deionized water cleaning.Compared with the conventional nanofiltration membrane,the flux decay rate was reduced by 84.6％,the steady-state flux was increased by 48.9％,and the flux recovery rate was increased by 11.8％,showing excellent anti-pollution performance.
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