Visible light catalyzed hollow fiber ultrafiltration membrane based on doped nano Cu2O and preparation method thereof

Abstract

The invention discloses a visible light catalyzed hollow fiber ultrafiltration membrane based on doped nano Cu2O and a preparation method thereof, and belongs to the technical field of membrane separation. 10% to 25% (w / W) of polysulfone or polyethersulfone, 8%-17% (w / W) of a pore-foaming agent, 0.1%-2% (w / W) of a surfactant, 0.1% to 5% (w / W) of the doped nano Cu2O and 51.0%-81.8% (w / W) of a solvent are added according to a certain order into a dissolving tank, stirred and dissolved at 35 to 95 DEG for 5-16 hours until complete dissolving, then defoamed by standing fo 8-36 hours to obtain a film casting solution; and the visible light catalyzed hollow fiber ultrafiltration membrane is prepared by a traditional dry-wet spinning process. The pure water flux of the prepared ultrafiltration membrane is greater than or equal to 320L / m<2>.hr. 0.1MPa, bovine serum protein retention rate is greater than or equal to 90.00%, the fulvic acid degradation rate is greater than or equal to 60% (under simulated visible light, running for 1 hour), and the prepared ultrafiltration membrane has good anti fouling properties and photocatalytic properties. The visible light catalyzed hollow fiber ultrafiltration membrane is especially suitable for the advanced treatment of micro polluted water source water, pretreatment of sea water desalination and deep treatment and reuse of wastewater pharmaceutical fields, and the like.

Description

technical field [0001] The invention relates to a polymer mixed matrix ultrafiltration membrane and a preparation method thereof, in particular to a method based on doped nano-Cu 2 Visible light-catalyzed hollow fiber ultrafiltration membrane of O and its preparation method. Background technique [0002] The scarcity of water resources and increasingly serious water pollution have become bottlenecks restricting social progress and economic development. The development of new water sources and the utilization of waste water resources have also become issues of global concern. Due to the extremely rich water resources in Shanghai and the large amount of waste water generated, the recycling of sewage and seawater desalination have become strategic choices to solve the water resource crisis. Among many sewage resource technologies, membrane separation technology is one of the best choices. [0003] Mixed matrix membrane, also known as hybrid membrane, is a membrane formed by c...

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Problems solved by technology

[0004] Chinese patent CN104383821A uses graphene oxide to support magnetic particles with a core-shell structure @TiO 2 The modified separation membrane was prepared, and it was considered that the separation membrane showed good photocatalytic degradation performance and anti-protein pollution performance for the target pollutant bovine serum albumin, but the separation performance and visible light catalytic degradation performance of the prepared membrane were not clarified in the patent application advantages and disadvantages, and the preparation process of the separation membrane is complicated; at the same time, the magnetic particles @TiO 2 The preparation method is complicated and the cost is high

Chinese patent CN102989329A passed AgNO 3 、TiO 2 Blending modification to prepare ultrafiltration membranes, in fact, mainly uses AgNO 3 Visible light catalytic activity, and the degradation rate is relatively slow (in the patent, the degradation rate of methylene blue is characterized by light for 10 hours), and it is impossible to prepare a separation membrane for separation and visible light catalysis at the same time; 3 PO 4 / TiO 2 Complex (Ag 3 PO 4 Nanoparticle deposition onto TiO 2 Surface) and polyvinylidene fluoride materials are blended and modified, so that the modified film has visible light catalytic antibacterial and antifouling properties, mainly using the deposited on TiO 2 Ag on the surface 3 PO 4 Particles degrade the organic matter adsorbed during the application of the separation membrane to reduce membrane fouling, and have not been used to prepare a separation membrane with both separation and visible light catalytic properties; at the same time, neither of these two patents has a synergistic effect to make full use of silver salts and TiO 2 The catalytic performance of silver salt or silver salt and TiO is only utilized by blending or deposition 2 Respective catalytic activity, visible light catalytic efficiency is low

[0006] The present invention uses doped nano Cu 2 O Improve the photocatalytic properties of polymer ultrafiltration membranes and prepare hollow fiber ultrafiltration membranes with visible light catalytic activity. There is no similar production of visible light catalytic hollow fiber ultrafiltration membrane products at home and abroad, and there are no related documents at home and abroad. to report