摘要
针对有机颜料废水中单价相似离子(例如CH3COO−和Cl−)分离难的问题,以表面活化能与脱水现象协同作用的分离机制为指导,在界面聚合中加入3,5-二氨基苯甲酸(DMA)来调控孔径、电性等性质,制备对醋酸根和氯离子具有高选择性的复合纳滤膜。XPS结果表明DMA参与界面聚合反应,形成疏松选择层;Zeta电位表明膜表面负电性增强。通过pH、操作压力等条件优化,得出0.6%(质量)DMA-TFC膜性能最佳,水通量较未改性复合膜提高44%,对于醋酸钠与硫酸钠的分离比达到15.0。本工作为相似离子分离纳滤膜的设计与制备提供了理论和实践基础,在颜料废水等水处理、物料分离等领域展现了良好的应用前景。
This paper aims to develop new nanofiltration membranes that achieve high selectivity of CH3COO−and Cl−,which is difficult to separate in pigment and other wastewater.Guided by the separation mechanism between the apparent activation energy and dehydration,3,5-diaminobenzoic acid(DMA)was utilized to adjust the pore size,surface charge and other properties of a thin film composite(TFC)nanofiltration membrane.XPS results show that DMA participates in the interfacial polymerization reaction to form a loose selective layer;Zeta potential shows that the surface of the film is negatively charged.By tuning the pH,operating pressure,and other conditions,the optimized membrane[0.6%(mass)DMA-TFC]was obtained with the water flux 44%higher than that of the unmodified composite membrane,and the separation ratio of CH3COO−and Cl−reached 15.0.This work provides a theoretical and practical basis for the design and preparation of nanofiltration membranes for similar ion separation.It shows great application prospects in the fields of water treatment such as pigment wastewater and material separation.
作者
刘宁
褚昌辉
王乾
孙世鹏
LIU Ning;CHU Changhui;WANG Qian;SUN Shipeng(State Key Laboratory of Materials-Oriented Chemical Engineering,College of Chemical Engineering,Nanjing Tech University,Nanjing 211816,Jiangsu,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2021年第1期578-588,共11页
CIESC Journal
基金
国家重点研发计划项目(2017YFB0307403-03)
国家自然科学基金项目(21878146)
江苏省自然科学基金杰出青年项目(BK20190037)
江苏高校优势学科建设工程资助项目(PAPD)。
关键词
纳滤膜
废水
相似离子分离
活化能
水合能
醋酸钠
氯化钠
nanofiltration membrane
wastewater
similar ions separation
activation energy
hydration energy
sodium acetate
sodium chloride
作者简介
第一作者:刘宁(1994-),男,硕士研究生,201861204196@njtech.edu.cn;第一作者:褚昌辉(1994-),男,硕士研究生,1393985710@qq.com;通信作者:孙世鹏(1985-),男,博士,教授,ssp@njtech.edu.cn。
