共沉积-交联法制备PDA/PEI-PVDF中空纤维复合超滤膜
Preparation of PDA/PEI-PVDF hollow fiber composite ultrafiltration membranes via the combining of co-deposition and cross-linking
冯子腾 1王彤 1林亚凯 1汪林 2余立新 1王晓琳1
作者信息
- 1. 清华大学化学工程系膜材料与工程北京市重点实验室,北京 100084
- 2. 清华大学化学工程系膜材料与工程北京市重点实验室,北京 100084;镇江清研膜业科技有限公司,镇江 212141
- 折叠
摘要
聚偏氟乙烯(PVDF)膜以其出色的化学稳定性、优异的耐高温性能和机械强度在许多领域得到广泛应用,而对膜孔径和亲水性的精确控制是优化膜分离效率、稳定性和持久性的关键.本文采用多巴胺(DA)与聚乙烯亚胺(PEI)共沉积并通过戊二醛实现交联的方法,将PVDF中空纤维膜的孔径从(119.0±3.55)nm减小到(16.2±0.36)nm,接触角由107.7°下降至61.4°,同时实现了膜孔径和亲水性调控,制备出对20 nm SiO2粒子截留率可达95％以上、对尺寸更大的粒子的截留率则高达99％以上的高性能PDA/PEI-PVDF中空纤维亲水超滤膜.本研究为超/微滤膜的性能调控提供了新思路.
Abstract
Polyvinylidene fluoride(PVDF)membranes are extensively employed across various fields owing to their remarkable chemical stability,elevated temperature resistance,and robust mechanical strength.The precise modulation of membrane pore dimensions and hydrophilicity plays a pivotal role in optimizing membrane separation efficiency,stability,and longevity.In this study,we proposed a co-deposition method of dopamine(DA)and polyethyleneimine(PEI)with cross-linking through glutaraldehyde to regulate the pore size and hydrophilicity of PVDF hollow fiber membranes.Reduction of the pore diameter from(119.0±3.55)nm to(16.2±0.36)nm and contact angle from 107.7° to 61.4° was achieved,simultaneously achieving membrane pore size and hydrophilicity regulation,leading to the preparation of a high-performance PDA/PEI-PVDF hollow fiber hydrophilic ultrafiltration membrane.The resulting membrane exhibited a rejection rate of more than 95％for 20 nm silica nanoparticles.The findings of this study provide a novel approach for tuning the performance of ultrafiltration/microfiltration membranes.
关键词
复合超滤膜/多巴胺/聚乙烯亚胺/共沉积/亲水性Key words
composite ultrafiltration membrane/dopamine/polyethyleneimine/co-deposition/hydrophilic-ity引用本文复制引用
基金项目
国家重点研发计划(2022YFC2105103)
清华大学春风基金(2021Z99CFY024)
出版年
2024
NETL
NSTL
万方数据