文献类型：期刊文献

中文题名：电喷雾法构筑MOFs/壳聚糖荷正电纳滤膜

英文题名：Preparation of MOFs/Chitosan Positively Charged Nanofiltration Membrane by Electrospray Method

作者：龚信瑀[1];杨峥[1];刘璨[1];王晓暄[1];马晓华[1]

机构：[1]华东理工大学化工学院,上海200237

年份：2022

卷号：48

期号：5

起止页码：616

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：Scopus;北大核心:【北大核心2020】；CSCD:【CSCD_E2021_2022】；

基金：国家自然科学基金面上基金(21978081);上海市自然科学基金(21ZR1417500)。

语种：中文

中文关键词：壳聚糖;金属有机骨架;纳滤膜;电喷雾

外文关键词：chitosan;metal-organic framework;nanofiltration membrane;electrospray

摘要：将壳聚糖的直接成膜性与电喷雾技术结合,并引入金属有机骨架(MOFs),制备了NH_(2)-UIO-66(Zr)/壳聚糖荷正电纳滤膜这一种复合膜,实现对Ni^(2+)的高效分离和富集。通过电喷雾技术可有效解决传统壳聚糖纳滤膜成膜周期长、膜层较厚、通量较低等问题。实验表明,与传统涂覆工艺相比,电喷雾法制备的壳聚糖复合膜在保持较高截留率的情况下,渗透性提高了634%。然而,单一壳聚糖基质膜受trade-off效应影响,分离性能难以进一步提升。引入NH_(2)-UIO-66(Zr)作为填料可有效缓解trade-off效应,所制备的复合膜在不牺牲截留率的情况下,相对于单一基质膜,其水通量进一步提升了38%,最终为4.7×10^(?5) L/(m^(2)·h·Pa),对NiCl_(2)截留率为92%。
Electrospray technology can solve the problems of long membrane formation period,thicker membrane layer and low flux of traditional chitosan nanofiltration membranes.In this study,the NH_(2)-UIO-66(Zr)/chitosan positively charged nanofiltration membrane based on NH_(2)-UIO-66(Zr)/chitosan was successfully prepared by combining the direct membrane-forming properties of chitosan with electrospray technology and introducing metal-organic frameworks(MOFs).This membrane has achieved efficient separation and enrichment of Ni^(2+).The morphology,structure and properties of membrane were investigated by SEM,EDS,Zeta potential,water contact angle measurements,etc.The results show that compared with the traditional coating process,the permeability of the chitosan composite membrane prepared by the electrospray method is increased by 634%,and the membrane can still maintain a good rejection.However,pure chitosan matrix membranes are usually affected by trade-off effect,and it is difficult to further improve the separation performance.The introduction of NH_(2)-UIO-66(Zr)as a filler could effectively alleviate the trade-off effect.Hybridization improved the hydrophilicity of the separation layer and formed a special membrane surface structure,thereby increasing permeability of the composite membrane.Experiments showed that the limit of NH_(2)-UiO-66(Zr)loading was 5%(the mass fraction of MOFs to chitosan).The optimized NH_(2)-UIO-66(Zr)/chitosan membrane had a higher flux than pristine chitosan membrane(increased by 38%).The prepared membrane exhibited a high NiCl_(2) rejection of 92%and a water permeability of 4.7×10^(?5) L/(m^(2)·h·Pa)(test pressure:4×105 Pa;feed concentration:0.5 g/L).In addition,the hybrid membrane exhibited excellent mechanical strength and had the potential to separate a single solution of MgCl_(2),ZnCl_(2) and Pb(NO_(3))_(2).