Affiliation:
1. Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of Education Hubei Key Laboratory of Material Chemistry and Service Failure School of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China
Abstract
AbstractPolyester nanofiltration membranes highlight beneficial chlorine resistance, but their loose structures and negative charge result in poor cations retention precluding advanced use in cations separation. This work designs a new monomer (TET) containing “hydroxyl‐ammonium” entities that confer dense structures and positive charge to polyester nanofiltration membranes. The TET monomer undergoes efficient interfacial polymerization with the trimesoyl chloride (TMC) monomer, and the resultant TET‐TMC membranes feature one of the lowest molecular weight cut‐offs (389 Da) and the highest zeta potential (4 mv, pH: 7) among all polyester nanofiltration membranes. The MgCl2 rejection of the TET‐TMC membrane is 95.5%, significantly higher than state‐of‐the‐art polyester nanofiltration membranes (<50%). The Li+/Mg2+ separation performance of TET‐TMC membrane is on par with cutting‐edge polyamide membranes, while additionally, the membrane is stable against NaClO though polyamide membranes readily degrade. Thus the TET‐TMC is the first polyester nanofiltration membrane for efficient cations separation.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science