Positively charged composite nanofiltration membrane based on gallic acid and preparation method of positively charged composite nanofiltration membrane

• Main Authors: TANG MENGDI, HUANG ZHONGHUA, ZHANG ZHEN, LIN XIAOLU
• Format: Patent
• Language: Chinese; English
• Published: 29.12.2020
• Subjects: CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a positively charged composite nanofiltration membrane based on gallic acid and a preparation method of the positively charged composite nanofiltration membrane. According to the method, a polyacrylonitrile hydrolysis membrane is used as a supporting layer and soaked in a homogeneous composite solution formed by gallic acid and polyethyleneimine, and the positively chargedcomposite nanofiltration membrane is prepared after thermal crosslinking. The method is easy to operate, free of pollution and free of by-products, the pure water permeability coefficient of the prepared composite nanofiltration membrane is 74.214 L*m *H<-1>*MPa<-1>, the molecular weight cutoff is 958 Da, the composite nanofiltration membrane belongs to the field of nanofiltration membranes, theisoelectric point of the membrane surface is 7.2, and the composite nanofiltration membrane has good hydrophilicity and pollution resistance and has a good removal effect on microscale-trace organicpollutants in water. 本发明公开了一种