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Graphene composite photocatalytic ultrafiltration membrane and preparation method thereof

A graphene composite, ultrafiltration membrane technology, applied in the field of photocatalysis, can solve the problems of poor bonding force between titanium dioxide and ultrafiltration membrane, poor membrane stability, catalyst loss, etc., and achieve the effect of improving hydrophilicity and anti-pollution ability.

Active Publication Date: 2020-02-21
江苏晖尔利电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the existing photocatalytic ultrafiltration membrane, it is generally to coat the photocatalyst on the surface of the membrane or blend the photocatalyst and the casting solution to form the membrane. During the process, the catalyst on the surface of the membrane is easily washed away by wastewater, resulting in poor membrane stability, and the latter solves the problem of catalyst loss by blending the cast membrane, but the general photocatalyst is inorganic particles, inorganic particles and organic ultrafiltration membranes. The compatibility is poor, and most of the blended inorganic particles are fixed in the membrane, and will not contact the wastewater during the application of the membrane, thus losing its original intention of photocatalysis
In addition, some researchers placed commercial ultrafiltration membranes in titanium dioxide precursors to achieve in-situ synthesis of titanium dioxide at the membrane pores. There is still the problem of catalyst loss in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The present embodiment adopts the following steps to prepare:

[0026] (1) Mix 12wt% polysulfone, 79wt% dimethyl sulfoxide, 6wt% anhydrous lithium chloride, and 3wt% graphene oxide, and stir at 30-60°C until completely dissolved to form a mixed solution, and Static defoaming for 24h to obtain the casting solution;

[0027] (2) Aminated nano-TiO 2 (10nm) is mixed with pure water to form a 300mg / L dispersion, and the pH value is adjusted to 8 by sodium carbonate, and ultrasonically treated at 60°C for 60min until the dispersion is uniform to form nano-TiO 2 coagulation liquid;

[0028] (3) Pour the casting solution on a smooth glass plate and scrape it into a 200μm polysulfone membrane with a scraper;

[0029] (4) Put the polysulfone membrane formed in step (2) in a pure water coagulation bath at 60°C for 5 minutes to solidify, then remove it from the glass plate, spread it in a suction filtration device, and pour it into step (2) Nano-TiO 2 coagulation solution, usi...

Embodiment 2

[0032] The present embodiment adopts the following steps to prepare:

[0033] (1) Mix 12wt% polysulfone, 79wt% dimethyl sulfoxide, 6wt% anhydrous lithium chloride, and 3wt% carboxylated graphene oxide, and stir at 30-60°C until completely dissolved to form a mixed solution , and standing for degassing for 24 hours to obtain the casting solution;

[0034] (2) Aminated nano-TiO 2 (10nm) is mixed with pure water to form a 300mg / L dispersion, and the pH value is adjusted to 8 by sodium carbonate, and ultrasonically treated at 60°C for 60min until the dispersion is uniform to form nano-TiO 2 coagulation liquid;

[0035] (3) Pour the casting solution on a smooth glass plate and scrape it into a 200μm polysulfone membrane with a scraper;

[0036] (4) Put the polysulfone membrane formed in step (2) in a pure water coagulation bath at 60°C for 5 minutes to solidify, then remove it from the glass plate, spread it in a suction filtration device, and pour it into step (2) Nano-TiO 2 ...

Embodiment 3

[0039] The present embodiment adopts the following steps to prepare:

[0040] (1) Mix 12wt% polysulfone, 82wt% dimethyl sulfoxide, and 6wt% anhydrous lithium chloride, and stir at 30-60°C until completely dissolved to form a mixed solution, and stand for 24 hours for defoaming to obtain Casting solution;

[0041] (2) Aminated nano-TiO 2 (10nm) is mixed with pure water to form a 300mg / L dispersion, and the pH value is adjusted to 8 by sodium carbonate, and ultrasonically treated at 60°C for 60min until the dispersion is uniform to form nano-TiO 2 coagulation liquid;

[0042] (3) Pour the casting solution on a smooth glass plate and scrape it into a 200μm polysulfone membrane with a scraper;

[0043] (4) Put the polysulfone membrane formed in step (2) in a pure water coagulation bath at 60°C for 5 minutes to solidify, then remove it from the glass plate, spread it in a suction filtration device, and pour it into step (2) Nano-TiO 2 coagulation solution, using suction filtra...

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Abstract

The invention discloses a graphene composite photocatalytic ultrafiltration membrane, and a preparation method thereof. The preparation method comprises the following steps: firstly, blending grapheneoxide and polysulfone to prepare a membrane; improving the hydrophilic and anti-pollution capabilities of the ultrafiltration membrane by utilizing the graphene oxide; then, taking a dispersion liquid of aminated titanium dioxide and water as a solidification liquid to carry out suction filtration and solidification on the semi-solidified ultrafiltration membrane; crosslinking amino groups of aminated titanium dioxide with carboxyl groups of carboxylated graphene oxide in the curing process, so that the binding force of titanium dioxide nanoparticles and the membrane is improved through physical and chemical dual effects, and the problem of loss of photocatalytic particles in a traditional photocatalytic ultrafiltration membrane is solved.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to a graphene composite photocatalytic polysulfone ultrafiltration membrane capable of photocatalytic degradation. Background technique [0002] With the significant improvement of people's living standards, water pollution has become a major environmental problem, which has attracted more and more countries' attention. At present, traditional treatment methods such as physical adsorption, chemical oxidation, and microbial treatment can only alleviate water pollution to a certain extent, but it is difficult to have a good treatment for organic substances that are very difficult to degrade and treat in polluted wastewater. effect. Photocatalytic technology is one of the fastest-growing technologies in recent years. Photocatalysts such as titanium dioxide can efficiently decompose certain organic and inorganic substances under the irradiation of a specific light source, thereby greatly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D61/14B01J21/06B01J35/02C02F1/30C02F1/44C02F101/30B01J35/00
CPCB01D71/68B01D69/02B01D67/0079B01D61/145B01J21/063C02F1/30C02F1/444B01D2325/36C02F2101/30B01J35/50B01J35/39
Inventor 徐业华
Owner 江苏晖尔利电子科技有限公司
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