Beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and preparation method thereof

A composite nanofiltration membrane and nanocrystal technology, applied in the field of nanofiltration membranes, can solve problems such as inapplicability of polymer membranes, improve separation efficiency and service life, do not cause secondary pollution, and enhance the effect of interaction

Active Publication Date: 2016-10-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention improves the performance of composite membrane separation, photocatalytic degradation and sterilization, and combines the three units of membrane separation, photocatalysis and sterilization. However, the preparation process requires high-temperature calcination, and only porous ceramic membranes can be used as substrates. not suitable for polymer films

Method used

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  • Beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and preparation method thereof
  • Beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and preparation method thereof
  • Beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Immerse the polyacrylonitrile ultrafiltration membrane in a sodium hydroxide solution with a concentration of 6wt%, react at 50°C for 1h, then soak and neutralize it with a 1mol / L hydrochloric acid solution overnight, and finally rinse it with deionized water until neutral , to obtain a hydrolyzed polyacrylonitrile ultrafiltration membrane.

[0052] (2) Weigh an appropriate amount of dopamine and polyethylenimine (Mw=600) and dissolve them in Tris buffer, prepare a coprecipitation solution whose concentration is 2 mg / mL, and immerse the hydrolyzed polyacrylonitrile ultrafiltration membrane into In the co-deposition solution, shake and deposit at 25°C for 2 hours, take it out, wash it with ultrapure water for 5 times, and place it in ultrapure water for 12 hours; then immerse the membrane in an ethanol solution with a concentration of 2% glutaraldehyde , reacted in a water bath at 50°C for 20 minutes, took it out and dried it in the air, rinsed it with ultrapure wate...

Embodiment 2～5

[0056] The concentrations of dopamine and polyethyleneimine in the co-deposition solution were adjusted, and other conditions were the same as in Example 1.

Embodiment 6～9

[0064] Regulate the co-deposition time of dopamine and polyethyleneimine, and all the other conditions are the same as in Example 1.

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Abstract

The invention discloses a beta-FeOOH nanocrystal-loaded photocatalytic composite nanofiltration membrane and a preparation method thereof. The photocatalytic composite nanofiltration membrane is prepared by performing codeposition on dopamine and polyethyleneimine on a porous supporting membrane to form a crosslinking nanofiltration membrane with a separating surface layer first and then loading beta-FeOOH nanocrystals on the separating surface layer. The loaded beta-FeOOH nanocrystals can promote photocatalytic oxidation reaction in the presence of hydrogen peroxide to degrade organic pollutants in wastewater or attached to the surface of the composite membrane, so that not only is achievement of the completely-innocent treatment of pollutant-containing wastewater facilitated, but also the pollution of the membrane surface can be reduced to achieve self cleaning of the membrane surface, and thus the separating efficiency of the composite nanofiltration membrane is improved and the service life of the composite nanofiltration membrane is prolonged.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a photocatalytic composite nanofiltration membrane loaded with β-FeOOH nanocrystals and a preparation method thereof. Background technique [0002] Water resources are the basis for human survival and social development. In recent years, with the progress of society and the prosperity of industry, the problem of water pollution is increasingly threatening the survival and development of human beings. Among them, due to the high concentration of COD in the dye-containing wastewater generated in industrial production, most of the organic components are based on aromatic hydrocarbons and heterocyclic compounds, and are developing in the direction of anti-photolysis, anti-oxidation, and anti-biological oxidation, which greatly increases wastewater treatment. difficulty. [0003] Nanofiltration membranes emerged in the 1980s, filling the gap in the application field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D69/12B01D71/02B01D71/62B01D71/68B01D71/42B01D67/00C02F1/44C02F1/72C02F1/32
CPCY02W10/37B01D61/027B01D67/0079B01D69/125B01D71/02B01D71/42B01D71/62B01D71/68B01D2323/30B01D2325/48C02F1/32C02F1/442C02F1/725C02F2305/10
Inventor 徐志康吕嫣张超郭毅林福文万灵书
Owner ZHEJIANG UNIV
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