Preparation of photocatalytic self-cleaning composite membrane high-efficiency dyes/salt separation based on tannin modified MIL-53(Fe)
Membrane separation has been widely employed in printing and dyeing wastewater treatment(PDW)for selective separation of dyes/salt mixtures.However,the current low membrane flux and inevitable fouling issues greatly reduce treatment efficiency.In this paper,TA@MIL-53(Fe)powder with hydrophilic and photocatalytic activity was prepared by surface functionalization and etching of tannins(TA).Subsequently,a novel high-throughput self-cleaning composite membrane was developed by incorporating photocatalytic active materials into the polyamide(PA)selection layer using vacuum filtration assisted technology.SEM,AFM,FTIR and UV-vis were used to explore the influence of materials on composite membranes and the photocatalytic self-cleaning mechanism.The results revealed that the composite membrane exhibited optimal performance when the amount of TA@MIL-53(Fe)added was 0.02％wt.At this composition,the membrane demonstrated a flux of 64.2 L·m-2·h-1·bar-1,with the dye retention rate for MB and TB remaining above 95％.At the same time,the prepared membrane had a low salt removal rate.Furthermore,compared to the membrane flux recovery(FRR)achieved through hydraulic flushing,the FRR of the MPTA-0.02 composite membrane after photocatalytic self-cleaning reached 96.5％.At the same time,MPTA-0.02 composite film had good self-cleaning performance and long-term stability.This provides a new approach for the development of dyes/salt separation membranes with excellent antifouling properties.
万方数据
维普
