关键词: 反渗透膜, 净水技术, 表面改性, 抗污染性, 抗菌性

Abstract: Shortage of clean drinking water and water pollution are two of the biggest challenges to human and social development. Reverse osmosis technology can provide an high-efficient and economical way to produce pure water and treat wastewater and mitigate water resources problem. However, this promising water treatment technology is often hampered by the bio-fouling of membrane. And membrane surface modification techniques are the most common method to promote anti-fouling performance of membrane. In this study, through the auto-agglutination of self-polymerization of dopamine (DA) on the membrane surface, a super-thin PDA film can be formed and the PDA film can provide a large number of active groups for the subsequent PEI grafting. With the successful grafting, we can get stable and durable PDA-PEI modified reverse osmosis membrane. The successful modification including the formation of PDA and its surface-grafting of PEI are confirmed by X-ray photoelectron spectroscopy (XPS). The test shows that modification enhanced the surface hydrophilicity. Furthermore, the simulated fouling and antibiosis experiments were done. The results showed that the modification enhanced the membrane anti-fouling and antibacterial properties.

Key words: reverse osmosis membrane, water purification technology, surface modification, anti-fouling, antibacterial