Doped-nano-Cu2O-based visible light catalysis plate ultrafiltration membrane and preparation method thereof

Abstract

The invention discloses a doped-nano-Cu2O-based visible light catalysis plate ultrafiltration membrane and a preparation method thereof and belongs to the technical field of membrane separation. The preparation method comprises the following steps: adding 8.0-20.0% (w / w) of polysulfone or polyether sulfone, 5.0-15.0% (w / w) of a pore-foaming agent, 0.05-2.0% (w / w) of a surfactant, 0.05-5.0% (w / w) of doped nano Cu2O and 58.0-86.9% (w / w) of a solvent into a three-mouth round-bottom flask according to a certain sequence; performing stirring at the temperature of 30-80 DEG C for 5-16 h for complete dissolution, and leaving to stand for defoaming for 8-24 h to prepare a casting membrane solution; and adopting a phase inversion method to perform membrane scraping on a clean glass plate to prepare the visible light catalysis plate ultrafiltration membrane. The prepared doped-nano-Cu2O-based visible light catalysis plate ultrafiltration membrane has the pure water flux of larger than or equal to 430 L / m<2> / hr / 0.1 MPa, the bovine serum albumin rejection ratio of larger than or equal to 90.00% and the fulvic acid degeneration removal rate of about 60% (running for 1 h under simulated visible light), has favorable anti-fouling property and visible light catalysis performance, and is particularly suitable for water treatment of micro-polluted water sources, seawater desalination pretreatment, treatment and recycling of wastewater in the fields of biology, chemical engineering and medicines.

Description

technical field [0001] The invention relates to a polymer mixed matrix ultrafiltration membrane and a preparation method thereof, in particular to a nano-Cu 2 Visible light catalysis flat ultrafiltration membrane of O and preparation method thereof. Background technique [0002] The scarcity of water resources and the increasingly serious water pollution have become the bottlenecks restricting social progress and economic development. Since Shanghai is extremely rich in water resources and produces a large amount of waste water, sewage recycling and seawater desalination have become a strategic choice to solve the water crisis. Membrane separation technology is one of the best choices among many technologies for wastewater recycling. [0003] Mixed matrix membrane, also known as hybrid membrane, is a membrane formed by chemically cross-linking or micro-mixing organic and inorganic components, also known as "organic-inorganic hybrid membrane", because it has the corrosion r...

AI Technical Summary

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 improves the visible light catalytic properties of polymer ultrafiltration membranes and prepares flat-plate ultrafiltration membranes with visible light catalytic activity. There are no relevant literature reports at home and abroad.