关键词: 纳滤膜, 制备方法, 功能化改性, 纳米添加剂, 染料废水

Abstract:

The printing and dyeing industry consumes a lot of water and produces a large amount of dye wastewater, which limits the green and sustainable development of the textile industry. As a new separation technology, nanofiltration (NF) which utilizes NF membrane as a medium to separate dyes from dye wastewater has been widely used in recent years due to its high separation efficiency and low energy consumption. The dyes in dying wastewater can be separated and recycled without dye degradation during the NF process. However, the NF membrane still has the problems, such as low flux rate, poor thermal stability and poor antifouling ability. In this review, the research progress of preparation and modification of NF membrane for dying wastewater treatment is reviewed. Firstly, the preparation methods of NF membrane including phase inversion, interfacial polymerization, co-deposition, layer-by-layer self-assembly, surface coating and surface grafting are introduced. Secondly, the modification of NF membranes, such as hydrophilic modification, chlorine resistance modification, antibacterial modification, high mechanical properties and thermal stable NF membrane is summarized. Furthermore, the challenges of NF membranes in preparation and application in harsh environments are pointed out. Finally, some perspectives on promising methods for improving the performance of NF membrane are provided.

Key words: nanofiltration, preparation, modification, nanoparticle additive, dying wastewater