Nitrogen plasma was used to modify the surface of polyvinylidene fluoride ultrafiltration (PVDF) membranes,and acrylic acid (AA) was grafted via gas-phase grafting,followed by the loading of Cu2O photocatalytic nanoparticles to improve the membrane's anti-pollution performance and self-cleaning capability.The results showed that the optimal conditions for the nitrogen plasma treatment were 150 seconds of modification time,35Pa of pressure,80W of RF power,and 40 cm from the discharge center.The contact angle was reduced to 65.98° after grafting acrylic acid and provided a carrier for loading Cu2O.Both ATR-FT-IR and SEM indicated that Cu2O was successfully loaded on the surface of PVDF ultrafiltration membranes.After loading Cu2O,the pure water flux and BSA flux of PVDF ultrafiltration membranes (composite membranes) were enhanced,the retention rate was increased from 59% to 85%,and the contamination rate was reduced from 68% to 49.8%.After 30min of light exposure,the pure water flux recovery rate of the composite membrane was 86.19%,which was much higher than that of the original membrane (19.82%),with self-cleaning performance.
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基金资助
国家自然科学基金(20807047)
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