Research group of Zhang Qiugen, associate professor of Xiamen University, has made new progress in the field of high performance separation membrane and membrane materials

Zhang Qiugen, associate professor of Xiamen University, has made new progress in the research of high-performance separation membranes and membrane materials Relevant research results were published in AIChE Journal (DOI: 10.1002 / AIC 16463) under the title of "teamminezinc complex integrated interpenetrating polymer network nanocomposite membrane for telephony recovery" Nanofiltration is a pressure driven membrane separation process between reverse osmosis and ultrafiltration Its pore diameter is 0.5 ~ 2 nm, which can intercept organic matters and multivalent ions with molecular weight greater than 200 da Meanwhile, it allows small organic matters and monovalent ions to penetrate It is mainly used in water softening, purification, separation, classification and concentration of substances with relative molecular weight of 100 At present, nanofiltration membrane is usually made of ultrafiltration membrane through interface polymerization, which has the disadvantages of large mass transfer resistance, small flux and high operating pressure, which limits the industrial application of nanofiltration In order to reduce the resistance of the membrane, the high-throughput nanofiltration membrane was prepared by nanofiber (including nanotube) support layer method The water flux of the membrane was more than two times of that of the same type nanofiltration membrane On this basis, supported by the ultra-thin packing layer of carbon nanotubes modified on the surface of polydopamine, our group recently constructed a PVA / PEI interpenetrating network separation layer on the microfiltration membrane, which can obtain a high-performance nanofiltration membrane with high flux and selective phosphate permeation after zinc ion modification The membrane has a high retention rate (> 85%) for divalent metal ions, while the retention rate for phosphate is less than 15% It has a potential application prospect in wastewater treatment and phosphorus recovery Under the guidance of Associate Professor Zhang Qiugen, the research work is mainly completed by doctoral student Faizal soyekwo (the first author) The research work is supported by the general program of NSFC (21676220).