Preparation method of CNT-modified nanofiltration membrane

• Main Authors: Li Xindong, Huang Wanfu, Liang Juan, An Zhantao
• Format: Patent
• Language: Chinese; English
• Published: 03.08.2016
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention provides a preparation method of a CNT-modified nanofiltration membrane. The preparation method comprises the following steps: covering the surface of one side of a porous support membrane with a CNT-containing aqueous phase solution, an organic phase solution and the CNT-containing aqueous phase solution in sequence; taking out and drying the membrane after reaction for a period of time; heat-treating and soaking the membrane in water to obtain the CNT-modified nanofiltration membrane. Compared with a conventional interfacial polymerization process, the preparation method provided by the invention has the characteristics that a polymer surface layer is formed on one side of the porous support membrane, which is conducive to better play a separation role of the nanofiltration membrane; an appropriate amount of CNT is dispersed in the aqueous phase solution, while a step of secondary infiltration of an aqueous phase is added, to not only optimize the mechanical properties of the nanofiltration me