Investigation of the preparation and desalination property of magnetic chitosan hybrid nanofiltration membranes
Nanofiltration membranes were prepared using polyacrylonitrile as membrane matrix and mag-netic chitosan(MCs)as dopant.The thermal stability and surface functional groups of the membranes were correspondingly characterized by thermogravimetric analysis and infrared spectroscopy.The effects of some factors including dopant content,feed concentration and trans-membrane pressure on the desalina-tion of the membranes were investigated.The results show that the thermal stability of the nanofiltration membrane increases,and the Ca2+rejection first increases then decreases,with the increasing of MCs content in membranes.The Ca2+rejection can reach to 100%for the as-prepared nanofiltration mem-branes with MCs content of 2%in raw materials under the conditions of feed concentration of 40 mg·L-1 and transmembrane pressure of 0.10 MPa.