Design of nanofibre interlayer supported forward osmosis composite membranes and its evaluation in fouling study with cleaning

Abstract

• A fine fibre (40–60 nm diameter) interlayer (~1 µm thickness) was electrospun.

• Fine fibre interlayer promoted formation of defect-free dense polyamide layer.

• FO membrane with dual-layer substrate had less organic fouling potential.

• High reverse salt flux accelerated organic fouling on FO membrane.

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 (AL-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.

Graphical abstract

Keywords

Forward osmosis / Electro-spinning / Interfacial polymerisation / Fouling / Polyvinylidene fluoride

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