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A composite ultrafiltration membrane loaded with enzyme-like ligands, its preparation method and application

An ultrafiltration membrane and ligand technology, applied in the field of water treatment, can solve the problems of easy deactivation of catalysts, difficult to remove micro-pollutants, slow oxidation rate, etc., to achieve great application prospects and improve the effect of long-term use performance.

Active Publication Date: 2021-12-14
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the oxidation rate of conventionally coupled advanced oxidation methods (such as electrocatalysis, photocatalysis, Fenton and Fenton-like, etc.) is relatively slow, and it is difficult to completely remove micropollutants under high membrane flux conditions. The catalyst on the catalyst is easily deactivated after long-term use, and some regeneration methods such as nitrogen high-temperature reduction, organic solvent cleaning, etc. are not suitable for use in the membrane system

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  • A composite ultrafiltration membrane loaded with enzyme-like ligands, its preparation method and application
  • A composite ultrafiltration membrane loaded with enzyme-like ligands, its preparation method and application
  • A composite ultrafiltration membrane loaded with enzyme-like ligands, its preparation method and application

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preparation example Construction

[0029] The present invention also provides a method for preparing the above-mentioned composite ultrafiltration membrane loaded with enzyme-like ligands, comprising: soaking the modified organic membrane in a solution containing enzyme-like ligands to obtain a composite ultrafiltration membrane loaded with enzyme-like ligands. Ultrafiltration membrane; the modified organic membrane is formed by graphene oxide / polyethyleneimine composite material and high molecular polymer.

[0030] Among them, the present invention has no special limitation on the sources of all raw materials, which can be commercially available.

[0031] In the present invention, the modified organic membrane is preferably prepared according to the following method: S1) mixing graphene oxide / polyethyleneimine composite material, high molecular polymer and porogen in a solvent to obtain a casting solution; S2 ) using the phase inversion method to form the film casting solution to obtain a modified organic film...

Embodiment 1

[0042] Graphene oxide is ultrasonically dispersed in water to obtain a concentration of 10mg / ml graphene oxide dispersion; the pH value of the graphene oxide dispersion is adjusted to a pH value of 10, and then mixed with 10mg / mL polyethyleneimine (molecular weight 3000) solution 600W ultrasonic mixing, the mass ratio of graphene oxide and polyethyleneimine in the mixed system is 1:3, react at room temperature for 24h, filter, and vacuum dry at 60°C for 12h to obtain graphene oxide / polyethylene imine composites.

[0043] Dissolve 0.3g of graphene oxide-polyethyleneimine, 3.7g of polyethersulfone and 0.2g of polyvinylpyrrolidone in 15.8g of N, N-dimethylacetamide solvent, 600W ultrasonic 30min after dispersion, in 60 ℃ oil bath Stir for 12 hours and vacuum degas to obtain the casting solution; use the phase inversion method to form the casting solution, scrape the casting solution on the glass plate with a 200 μm metal scraper, and phase convert it into a film in ultrapure wate...

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Abstract

The invention provides a composite ultrafiltration membrane loaded with enzyme-like ligands, comprising a modified organic membrane and an enzyme-like ligand loaded on the modified organic membrane; the modified organic membrane is composed of graphene oxide / polyethylene Amine composites are formed with high molecular weight polymers. Compared with the prior art, the present invention combines enzyme-like ligands in the ultrafiltration membrane system. On the one hand, the enzyme-like ligands have very high catalytic activity and can activate hydrogen peroxide to degrade micro-pollutants in a short period of time. , which significantly improves the removal effect of ultrafiltration membranes for small molecules and micropollutants under low operating pressure and high membrane flux; on the other hand, simple adsorption methods can be used to regenerate enzyme-like ligands, thereby significantly improving the composite ultrafiltration The long-term use performance of the filter membrane has great application prospects.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a composite ultrafiltration membrane loaded with enzyme-like ligands, a preparation method and application thereof. Background technique [0002] As the most promising water treatment technology, membrane technology has achieved great success in various water purification in recent years. At present, the most widely used membranes are reverse osmosis membrane, nanofiltration membrane, ultrafiltration membrane and microfiltration membrane. Among them, reverse osmosis membrane and nanofiltration membrane can partially intercept and remove micro-pollutants of small molecules (<1000Da), but both of them have high operating pressure, high requirements on water quality, and high cost, making them difficult to apply on a large scale. Although ultrafiltration membranes and microfiltration membranes are relatively mature in technology, low in operating pressure and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/14B01D67/00B01D69/12B01D71/02B01D71/34B01D71/36B01D71/58B01D71/68C02F1/44
CPCB01D71/68B01D71/36B01D71/34B01D71/58B01D71/021B01D69/12B01D67/0079B01D61/145C02F1/444
Inventor 盛国平张汉超张信郭璞璨
Owner UNIV OF SCI & TECH OF CHINA