基于羟醛缩合反应构建电中性中空纤维疏松纳滤分离层及染料去除的研究
Construction of electroneutral hollow fiber loose nanofiltration separation layer based on aldol condensation reaction and the investigation on dye removal
汤申艺 1武彪 2崔振宇3
作者信息
- 1. 天津工业大学材料科学与工程学院,天津 300387;天津天一爱拓科技有限公司,天津 300382
- 2. 天津天一爱拓科技有限公司,天津 300382
- 3. 天津工业大学材料科学与工程学院,天津 300387
- 折叠
摘要
以聚偏氟乙烯(PVDF)/苯乙烯-马来酸酐(SMA)中空纤维超滤膜为基膜,在膜表面依次引入三乙二醇(TEG)、戊二醛(GA)、聚乙烯醇(PVA)3种亲水有机物,基于羟醛缩合反应在膜表面构建了稳定致密的电中性疏松纳滤(LNF)分离层.研究了膜的微结构特征和分离性能.结果表明,随着接枝反应的发生,膜亲水性逐渐提高,表面接近中性.带负电荷的 日落黄(SY)和正电荷的结晶紫(CV)染料均可被完全去除,并保持较高的渗透通量[27.8 L/(m2·h),28.9 L/(m2·h)].此外,膜还表现出优异的化学稳定性和长期运行稳定性.本工作为制备具有高分离性能的电中性中空纤维纳滤膜提供了一种新的途径.
Abstract
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.
关键词
电中性/化学交联/中空纤维膜/疏松纳滤/染料脱除Key words
electroneutrality/chemical cross-linking/hollow fiber membrane/loose nanofiltration/dye removal引用本文复制引用
基金项目
国家自然科学基金面上项目(21978213)
出版年
2024
NETL
NSTL
维普
万方数据