The Institute of Seawater Desalination and Multipurpose Utilization, Tianjin 300192, China
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DOI:
10.7502/j.issn.1674-3962.2016.03.11
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Abstract:
Most of the commercial nanofiltration membrane is generally negatively charged. However, in certain areas, negatively charged nanofiltration membrane can not be employed because of membrane fouling. So positively charged nanofiltration membrane research is given more and more concern and attention. Chitosan, a abundant and low cost natural biopolymer, has good film forming properties. Chitosan nanofiltration membrane is positively charged because of amino groups on chitosan molecular chain. Therefore, the application of chitosan in positively charged nanofiltration membrane will have great significance to the industry. At present, chitosan positively charged nanofiltration membrane has been studied extensively. This paper is to summarize and analyze the preparation in positively charged nanofiltration membrane of chitosan , such as composite method, interfacial polymerization, blending method, graft reaction, plasma method. Research shows that the chitosan nanofiltration membrane can be generally used in selective separation of different electrolytes, seawater desalination pretreatment, the hardness removal of wastewater. Finally, this paper is to forecast its developmental trend. Substantive problem breakthrough is one of the keys whether commercial application of chitosan positively charged nanofiltration membrane can be achieved.