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A kind of photocatalytic ultrafiltration membrane and preparation method thereof

An ultrafiltration membrane and photocatalysis technology, applied in the field of photocatalysis, can solve the problems of catalyst erosion loss, poor compatibility, catalyst loss, etc.

Active Publication Date: 2021-06-25
TAIZHOU QINGRUN ENVIRONMENTAL PROTECTION TECH CO LTD
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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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Effect test

Embodiment 1

[0026] The present embodiment adopts the following steps to prepare:

[0027] (1) Mix 10wt% polysulfone, 78wt% dimethyl sulfoxide, and 12wt% anhydrous lithium chloride, and stir at 30-60°C until completely dissolved to form a mixed solution, and stand for 24 hours to obtain Casting solution;

[0028] (2) Nano-TiO 2 (10nm) is mixed with pure water to form a 300mg / L dispersion, and the pH value is adjusted to 4 by hydrochloric acid, and ultrasonically treated at 60°C for 60 minutes until the dispersion is uniform to form a nano-TiO2 coagulation solution;

[0029] (3) Pour the casting solution on a smooth glass plate and scrape it into a 200μm polysulfone membrane with a scraper;

[0030] (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 filtration to make n...

Embodiment 2

[0033] The present embodiment adopts the following steps to prepare:

[0034] (1) Mix 15wt% polysulfone, 73wt% dimethyl sulfoxide, and 12wt% anhydrous lithium chloride, and stir at 30-60°C until completely dissolved to form a mixed solution, and stand for 24 hours to obtain Casting solution;

[0035] (2) Nano-TiO 2 (10nm) is mixed with pure water to form a 300mg / L dispersion, and the pH value is adjusted to 4 by hydrochloric acid, and ultrasonically treated at 60°C for 60min until the dispersion is uniform to form nano-TiO 2 coagulation liquid;

[0036] (3) Pour the casting solution on a smooth glass plate and scrape it into a 200μm polysulfone membrane with a scraper;

[0037] (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, lay it flat on the suction filtration device, and pour it into step (2) Nano-TiO 2 coagulation solution, using suction filtration to make nano...

Embodiment 3

[0040] The present embodiment adopts the following steps to prepare:

[0041] (1) Mix 10wt% polysulfone, 82wt% dimethyl sulfoxide, and 8wt% anhydrous lithium chloride, and stir at 30-60°C until completely dissolved to form a mixed solution, and stand for 24 hours to obtain Casting solution;

[0042] (2) Nano-TiO 2 (10nm) is mixed with pure water to form a 300mg / L dispersion, and the pH value is adjusted to 4 by hydrochloric acid, and ultrasonically treated at 60°C for 60 minutes until the dispersion is uniform to form a nano-TiO2 coagulation solution;

[0043] (3) Pour the casting solution on a smooth glass plate and scrape it into a 200μm polysulfone membrane with a scraper;

[0044] (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, lay it flat on the suction filtration device, and pour it into step (2) Nano-TiO 2 coagulation solution, using suction filtration to mak...

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Abstract

The invention provides a photocatalytic ultrafiltration membrane and a preparation method thereof, specifically, by adding TiO 2 The dispersion of nanoparticles and water is used as a coagulation liquid to filter and solidify the semi-cured ultrafiltration membrane. Compared with the prior art, TiO is fixed on the cured ultrafiltration membrane. 2 The method has better binding force and solves the problem of loss of photocatalytic particles existing in traditional photocatalytic ultrafiltration membranes.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and in particular relates to a 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 reducin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D61/14B01J21/06B01J35/02C02F1/30C02F1/44C02F101/30B01J35/00
CPCB01D71/68B01D69/02B01D67/0079B01D61/145B01J21/063C02F1/30C02F1/444B01D2325/36C02F2101/30B01J35/39B01J35/50
Inventor 徐业华
Owner TAIZHOU QINGRUN ENVIRONMENTAL PROTECTION TECH CO LTD
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