Discussion on the construction of intermediate layer and the properties of reverse osmosis composite membrane
In this paper,polyvinyl chloride(PVC)ultrafiltration base membrane was prepared,and through the reaction of polyamines(diethylenetriamine-DETA and piperazine-PIP)and polyacids(itaconic acid-IA,maleic anhydride-MAH and citric acid-CA),intermediate layer of base membrane surface was formed,reverse osmosis(RO)composite membrane was prepared by interfacial polymerization(IP)of m-phenylenediamine(MPD)and trimesoyl chloride(TMC)and the effects of DETA/IA reaction times of polyamines/polyacids(DETA/CA,DETA/MAH,DETA/IA and PIP/IA)on the properties of interlayer and RO film were discussed.It is shown from the result that,at 50 ℃,for the RO composite membrane prepared by 3 mol/L diethylenetriamine and 0.5 mol/L itaconic acid through reaction for 4 times on the surface of the base membrane,the desalination rate for 1 800 mg/L sodium chloride water solution was 97.58％at 2.0 MPa pressure and water flux was 34.8 L/(m2·h·MPa).Compared with the blank control RO membrane,the water flux increased by 41.3％.Therefore,the method of constructing intermediate layer provides a theoretical basis for the preparation of high-flux RO composite membranes.
万方数据
维普
