One of the most common ultrafiltration membrane materials is polyvinylidene fluoride (PVDF). This material exhibits excellent chemical and oxidation resistance, enabling long-term stable operation in chlorine-containing or complex water environments, making it widely used in municipal and industrial water treatment systems. PVDF membranes are typically modified with hydrophilicity to reduce membrane fouling and improve flux stability.
Another common material is polyethersulfone (PES) or polysulfone (PSF). These materials possess high mechanical strength and good thermal stability, with uniform membrane structure and stable separation performance, making them suitable for precision filtration applications with high water quality requirements. However, their natural hydrophilicity is relatively weak, usually requiring surface modification or additives to improve their antifouling properties.
There are also some newer or modified materials, such as PAN (polyacrylonitrile), CA (cellulose acetate), and ceramic ultrafiltration membranes. Ceramic membranes are made from inorganic materials such as alumina and zirconium oxide, possessing extremely strong high-temperature resistance, acid and alkali resistance, and antifouling capabilities, making them suitable for extreme industrial environments, but at a higher cost. Overall, the selection of ultrafiltration membrane materials requires a balance between performance, cost, and application environment to meet the needs of different water treatment systems.