不同粒径UiO-66混掺改性TFN-FO膜的构建及性能评价
Construction and performance evaluation of TFN-FO membranes incorporated with UiO-66 nanoparticles of different sizes
张文焱 1刘浩 1宋伟龙 1赵频 1王新华2
作者信息
- 1. 江南大学环境与土木工程学院,江苏 无锡 214122
- 2. 江南大学环境与土木工程学院,江苏 无锡 214122;江苏省生物质能与减碳技术工程实验室,江苏 无锡 214122
- 折叠
摘要
以锆基金属-有机骨架材料(MOFs)UiO-66作为研究对象,制备了三种不同粒径的UiO-66纳米颗粒,并将其混掺到薄层复合膜(TFC)的聚酰胺(PA)层内,研究了UiO-66纳米颗粒的粒径对薄层复合纳米正渗透(TFN-FO)膜性能的影响.通过扫描电子显微镜(SEM)、原子力显微镜(AFM)、水接触角(WCA)测量仪、X射线光电子能谱仪(XPS)等表征手段,探究了TFN-FO膜的性质变化.结果表明,减小UiO-66的粒径不会影响TFN-FO膜的高亲水性,并且随着UiO-66粒径的减小,TFN-FO膜的粗糙度降低、交联度升高.通过以去离子水和2 mol/L氯化钠溶液作为进料液和汲取液的实验室自制的正渗透系统对膜性能进行评价,发现混掺小粒径(50 nm)UiO-66的TFN-FO膜可以在保持较低反向盐通量的同时实现35%的水通量提升.有机污染实验表明,TFN-FO膜具有良好的抗污染性能.
Abstract
With zirconiumv(Ⅳ)-carboxylate metal-organic framework(MOF)UiO-66 nanoparticles as representative,UiO-66 nanoparticles with different particle sizes were prepared and incorporated in polyamide(PA)layer of thin-film composite(TFC)membranes to investigate the impact of UiO-66 nanoparticle size on the performance of thin film composite nano-forward osmosis(TFN-FO)membranes.The effects of incorporated UiO-66 nanoparticle on the property of TFN-FO membranes were characterized by scanning electron microscopy(SEM),atomic force microscopy(AFM),water contact angle(WCA)instrument and X-ray photoelectron spectroscopy(XPS).The results showed that reducing the particle size of UiO-66 would not affect the high hydrophilicity of TFN-FO membrane.Meanwhile,as the particle size of UiO-66 decreased,the roughness of TFN-FO membrane decreased and the crosslinking degree increased.Moreover,the performance of TFN-FO membrane was evaluated by a home made forward osmosis system with deionized water and 2 mol/L sodium chloride solution as feed and draw solution.TFN-FO membrane incorporated with small particle size(50 nm)UiO-66 achieved 35%water flux improvement while maintaining a low reverse salt flux.Moreover,organic pollution experiments show that the TFN-FO membrane has good anti-fouling properties.
关键词
膜/过滤/纳米粒子/正渗透/MOFs/粒径/混掺改性Key words
membrane/filtration/nanoparticles/forward osmosis/MOFs/particle size/incorporate引用本文复制引用
基金项目
国家自然科学基金青年基金(52100089)
出版年
2024
国家科技期刊平台
NSTL
万方数据