Positively charged nanofiltration membrane as well as preparation method and application thereof

• Main Authors: CHEN KEKE, CHEN TAO, PAN QIAOMING, TAN HUIFEN, HONG YONG-KI, ZHANG YU, LIU WENCHAO
• Format: Patent
• Language: Chinese; English
• Published: 15.07.2022
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention relates to a positively charged nanofiltration membrane as well as a preparation method and application thereof. The preparation method of the positively charged nanofiltration membrane comprises the following steps: providing a supporting membrane; a pretreatment solution is placed on the first surface of the supporting membrane, the pretreatment solution comprises a cationic surface active agent, fatty acid serves as a solvent, and the solubility of the fatty acid in water at the temperature of 20 DEG C is smaller than or equal to 0.01 g per 100 g of water; the water-phase solution and the oil-phase solution are sequentially placed on the first surface of the supporting membrane, then heat treatment is carried out to form a compact layer, the positively charged nanofiltration membrane is obtained, the water-phase solution comprises positively charged water-soluble polymers and polyamine, and the oil-phase solution comprises polyacyl chloride. According to the preparation method, the positively