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High-flux modified titanium oxide composite ultrafiltration membrane and application thereof

A titanium oxide, high-throughput technology, applied in the field of membrane separation, can solve the problems of easy blocking of membrane pores, reduced service life, easy corrosion of ceramic membranes, etc., to improve hydrophilicity, strong hydrophilicity, and improve anti-pollution performance. and the effect of water flux

Pending Publication Date: 2021-12-17
SANDA FILM SCI & TECH XIAMEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, oily wastewater is easy to corrode the ceramic membrane and easily block the membrane pores, reducing the service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1)-(3) are the same as Comparative Example 2.

[0041] (4) soak the material obtained in step (3) with 1mol / L sodium hydroxide solution for 5h, dry at 100°C for 24h, and soak in 3-aminopropyltriethoxysilane ethanol with a concentration of 2mmol / L after cooling The solution was reacted at room temperature for 12 hours, and then washed several times with ethanol and deionized water successively, put into an oven and dried at a temperature setting of 150°C for 12 hours, and then cooled with the furnace to obtain a grafted ceramic film.

[0042] (5) Soak the grafted ceramic membrane in an aqueous solution of sulfoalanine with a concentration of 1mol / L. After soaking for 10 minutes, take out the membrane tube and react it in an oven at 80°C for 3 hours to prepare the high-throughput modified oxidation Titanium composite ultrafiltration membrane (the water surface contact angle of the titanium oxide film layer is 10°).

[0043] Under the conditions of 0.1MPa and 25°C, the h...

Embodiment 2

[0045] (1) Preparation of titanium oxide sol by sol-gel method: 0.5% dispersant polyethylene glycol is added in 1mol / L n-butyl titanate solution, in the sol-gel reaction, the amount of n-butyl titanate and water The molar ratio is 1:100, and then acid is added for degumming, the pH of the sol after degumming is 5, and a titanium dioxide sol is obtained, and then 1% of a dispersant polyethylene glycol is added and mixed evenly to make a well-dispersed titanium dioxide Sol.

[0046] (2) Add 3% polyvinyl alcohol and 2% hydroxyethyl cellulose to the well-dispersed titanium oxide sol, mix well, and then add 0.1% defoamer to make a uniformly dispersed coating solution .

[0047](3) The above-mentioned coating solution was coated on a porous ceramic membrane support body with an average pore size of 0.1 μm by dip coating, and then heated to 120 °C at room temperature at a rate of 1 °C / min, then kept and dried for 5 h, and then heated for 5 h. The temperature was raised to 700°C at ...

Embodiment 3

[0052] (1)-(4) are the same as embodiment 2.

[0053] (5) Soak the grafted ceramic membrane in an aqueous solution of sulfoalanine with a concentration of 5 mol / L. After soaking for 10 minutes, take out the membrane tube and react it in an oven at 80°C for 5 hours to prepare the high-throughput modified oxidation Titanium composite ultrafiltration membrane (the water surface contact angle of the titanium oxide film layer is 6°).

[0054] Under the conditions of 0.1MPa and 25°C, the high-throughput modified titanium oxide composite ultrafiltration membrane prepared in this example has a rejection rate of 98% for oily wastewater with an oil content of 15g / L, and a flux of 570LHM for oily wastewater.

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Abstract

The invention discloses a high-flux modified titanium oxide composite ultrafiltration membrane and application thereof. The surface of a membrane is modified through cysteic acid, and carboxyl on the cysteic acid can react with a silane coupling agent on a ceramic membrane, so that the hydrophilicity of the membrane is improved, and the water surface contact angle of the titanium oxide membrane is increased to 6-10 degrees from 3-8 degrees. The hydrophilic group of cysteic acid comprises two parts, namely sulfo and amino, and part of the hydrophilic group of cysteic acid and a solvent can form multiple hydrogen bonds, so that the surface of the membrane has very strong hydrophilicity, and the anti-pollution performance and the water flux are improved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and in particular relates to a high-flux modified titanium oxide composite ultrafiltration membrane and its application. Background technique [0002] With the rapid development of social economy, people produce a large amount of oily wastewater in production and life. Research and surveys have shown that oily wastewater is produced in chemical, food, petroleum, metallurgy, pharmaceutical and other industrial fields. A large amount of oily wastewater is directly discharged into natural water every year on the earth. These oily wastewater will cause great harm to the environment. Irrigation of farmland with oily wastewater will cause crop yield reduction or death. Livestock drinking oily wastewater will cause esophageal infection and cause disease, and will endanger human health through the food chain. Therefore, how to efficiently treat oily wastewater has become a hot spot for resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/02B01D69/12B01D69/02B01D67/00B01D61/14C02F1/44C02F1/40
CPCB01D71/024B01D69/02B01D69/125B01D67/0079B01D67/0093B01D61/145C02F1/444C02F1/40B01D2325/36B01D69/12B01D71/05B01D61/14B01D67/00C02F1/44
Inventor 陈云强洪昱斌方富林蓝伟光
Owner SANDA FILM SCI & TECH XIAMEN
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