Construction of electroneutral hollow fiber loose nanofiltration separation layer based on aldol condensation reaction and the investigation on dye removal
In this work,polyvinylidene fluoride(PVDF)/styrene maleic anhydride(SMA)hollow fiber ultrafiltration membrane was used as a substrate matrix,a robust and compact electroneutral hollow fiber loose nanofiltration(LNF)separation layer was constructedbased on the aldol condensation reaction by sequentially introducing three hydrophilic compounds[triethylene glycol(TEG),glutaraldehyde(GA),polyvinyl alcohol(PVA)]on the membrane surface.The microstructural characteristics and separation performance of the membrane were systematically analysed.The acquired results indicated hydrophilicity gradually increased and charge relatively neutralas chemical reaction occurred.Both negatively charged Sunset Yellow(SY)and positively charged Crystal Violet(CV)dyes can be completely removed while maintaining high permeation flux[27.8 L/(m2·h),28.9 L/(m2·h)].In addition,the membrane exhibited excellent chemical stability and long-term operation stability.This work provides a novel method to fabricate electroneutral hollow fiber LNF membrane with high separation performance.
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