Antifouling Performance And Adsorption Property Of Membrane With Polyrotaxane

The problems existed widely in membrane separation are the high cost of membrane and membrane fouling, which directly affect the efficiency and economics of membrane separation. For solving these problems, anti-fouling membranes with lower cost were prepared. The composite membranes were prepared by coating a layer of casting solution on the cheap industrial fabric. The structures and characteristics of membranes were studied. The results proved that the membrane was hydrophilic, antifouling and low-cost and they processed a high property of adsorption.(1) The composite membranes were prepared by dip-coating method using casting solution consisted of Polyrotaxane (PR)/Polyrotaxane, TiO₂ and Polyvinyl alcohol (PVA). After filtrating simulated wastewater, the results showed that the membranes had a good compatibility, reasonable flux, good rejection and better antifouling. Compared PR(2%)-PVA(5%) or PR(2%)-PVA(10%)-TiO₂ membrane with other membranes, it had the lowest fouling resistance and better rejection ability.(2) During the toluene adsorption experiment, PR(2%)-PVA(5%) and PR(2%)-PVA(10%) -TiO₂ membranes showed a potentially high capacity of adsorption towards micro-pollutants such as toluene. And the best result indicated that the membranes of 6 cm diameter could adsorb 1.4 mg (PR(2%)-PVA(5%)) and 1.3 mg (PR(2%)-PVA(10%)-TiO₂) toluene(11mg/L) after 2 h immersion in 200 mL solution. This is of significance to the purification of micro-polluted water and disposal of adsorptive production.(3) The experiments of PR-PVA-TiO₂ membranes regenerating showed that the membranes could be reused after ultraviolet radiating. PR(1%)-PVA(10%)-TiO₂ regenerated membrane could adsorb 0.9 mg toluene, nearly 70% removal efficiency and the removal efficiency highly improved about 35% after regenerating.It was found that PR could significantly improve the hydrophilicity and special adsorptive ability of the membranes because of its moleculer structure. And it was possible to use TiO₂ for membrane regenerating. Based on these results, the application of the composite membranes is wide.