Nanofibre-supported forward osmosis(FO)membranes have gained popularity owing to their low structural parameters and high water flux.However,the nanofibrous membranes are less stable in long-term use,and their fouling behaviours with foulants in both feed solution(FS)and draw solution(DS)is less studied.This study developed a nanofibrous thin-film composite(TFC)FO membrane by designing a tiered dual-layer nanofibrous substrate to enhance membrane stability during long-term usage and cleaning.Various characterisation methods were used to study the effect of the electrospun nanofibre interlayer and drying time,which is the interval after removing the M-phenylenediamine(MPD)solution and before reacting with trimesoyl chloride(TMC)solution,on the intrinsic separation FO performance.The separation performance of the dual-layer nanofibrous FO membranes was examined using model foulants(sodium alginate and bovine serum albumin)in both the FS and DS.The dual-layer nanofibrous substrate was superior to the single-layer nanofibrous substrate and showed a flux of 30.2 L/m2/h(LMH)when using 1.5 mol/L NaCl against deionised(DI)water in the active layer facing draw solution(AAL-DS)mode.In the fouling test,the water flux was effectively improved without sacrificing the water/solute selectivity under the condition that foulants existed in both the FS and DS.In addition,the dual-layer nanofibrous TFC FO membrane was more robust during the fouling test and cleaning.

Tao Ma;Haiqing Hui;Xiaofei You;Zhiqiang Pei;Miao Tian;Bing Wu

School of Ecology and Environment,Northwestern Polytechnical University,Xi'an 710072,China;Singapore Membrane Technology Centre,Nanyang Environment and Water Research Institute,Nanyang Technological University,Singapore 637141,Singapore;Beijing Origin Water Membrane Technology Co.,Ltd.,Beijing 101407,China;Faculty of Civil and Environmental Engineering,University of Iceland,Reykjavik IS-107,Iceland

环境科学与工程前沿

[1]Tao Ma;Haiqing Hui;Xiaofei You;Zhiqiang Pei;Miao Tian;Bing Wu-.Design of nanofibre interlayer supported forward osmosis composite membranes and its evaluation in fouling study with cleaning)[J].环境科学与工程前沿,2022(09):77-88

nanofibre,Nanofibre,deionised

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