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Preparation method of polyetherimide (PEI) photocatalytic ultrafiltration membrane loaded with titanium dioxide nanowire on surface

A surface-loaded, nanowire technology, used in chemical instruments and methods, physical/chemical process catalysts, ultrafiltration, etc., can solve the problems of reducing membrane separation efficiency, affecting membrane pure water flux, poor hydrophilicity, etc. The effect of reducing the attenuation coefficient, improving the performance, and improving the hydrophilicity of the membrane

Active Publication Date: 2018-02-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary PEI membranes are poor in hydrophilicity, which affects the pure water flux of the membrane. At the same time, hydrophobic PEI membranes are easily polluted by organic pollutants, and substances such as proteins are easily adsorbed on the surface of the membrane or block the pores of the membrane, reducing the membrane flux. separation efficiency

Method used

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  • Preparation method of polyetherimide (PEI) photocatalytic ultrafiltration membrane loaded with titanium dioxide nanowire on surface
  • Preparation method of polyetherimide (PEI) photocatalytic ultrafiltration membrane loaded with titanium dioxide nanowire on surface
  • Preparation method of polyetherimide (PEI) photocatalytic ultrafiltration membrane loaded with titanium dioxide nanowire on surface

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Step 1. Prepare PEI film-making solution: mix NMP, PEI and commercial Degussa P25 titanium dioxide nanoparticles at a mass ratio of 60:20:1, and place in an oil bath at 70°C to keep warm, and stir with a mechanical stirrer for 8 h, preparing a PEI film-making solution;

[0028] Step 2. Pour the PEI film-making solution obtained in step 1 on a clean glass plate, fix the glass plate on the glue-spinning machine, rotate it at a rotation speed of 4000rpm for 30s, and then immerse the glass plate coated with the film-making solution in the In deionized water, gradually dissolve the NMP solvent in deionized water, and form a layer of film after the film-making solution is solidified. Immerse the obtained film in deionized water and let it stand for 12 hours to obtain a uniform PEI / P25 film;

[0029] Step 3. Place the PEI / P25 membrane prepared in step 2 in NMP solution at 50°C for 8s, take it out and rinse it with deionized water before use;

[0030] Step 4, preparation of hy...

Embodiment 2

[0036] Step 1. Prepare PEI film-making solution: mix NMP, PEI and P25 particles in a mass ratio of 40:20:1, and place them in an oil bath at 70°C to keep warm, and stir with a mechanical stirrer for 8 hours to prepare PEI-made Membrane fluid;

[0037] Step 2, with embodiment 1;

[0038] Step 3, with embodiment 1;

[0039] Step 4, prepare the hydrogen peroxide reaction solution; the concentration of hydrogen peroxide is 20%, the concentration of melamine is 1.3g / L, the concentration of nitric acid is 0.9%, the concentration of titanium sponge is 4g / L, and the usage amount of the solution is proportional to the area of ​​the membrane, which is 2ml / cm 2 ;

[0040] Step 5. Place the PEI / P25 film obtained in step 3 in the hydrogen peroxide reaction solution prepared in step 4, keep it in an oven at 60°C for 24 hours, take it out and wash it with water for use;

[0041] Step 6, with embodiment 1.

Embodiment 3

[0043] Step 1. Prepare PEI film-making solution: mix NMP, PEI and P25 particles at a mass ratio of 40:20:1, and place them in an oil bath at 70°C to keep warm, and stir with a mechanical stirrer for 8 hours to prepare PEI film-making liquid;

[0044] Step 2, with embodiment 1;

[0045] Step 3. Place the PEI / P25 membrane prepared in step 2 in the NMP solution at 50°C for 10 seconds, take it out and rinse it with deionized water before use;

[0046] Step 4, prepare hydrogen peroxide reaction solution; hydrogen peroxide concentration is 30%, melamine concentration is 2g / L, and nitric acid concentration is 1.4%, and the concentration of sponge titanium is 5g / L, and the consumption of solution is directly proportional to the area of ​​film, is 2ml / cm 2 ;

[0047] Step 5. Place the PEI / P25 film obtained in step 3 in the hydrogen peroxide reaction solution prepared in step 4, keep it in an oven at 60°C for 72 hours, take it out and wash it with water for use;

[0048] Step 6, wi...

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Abstract

The invention discloses a preparation method of a polyetherimide (PEI) photocatalytic ultrafiltration membrane loaded with a titanium dioxide nanowire on a surface. The method comprises the followingsteps: 1) preparing PEI membrane making liquid: uniformly dissolving PEI and P25 into an NMP solution; 2) performing rotary coating and rubber rejection: making the membrane making liquid into a PEI / P25 composite membrane, and soaking a glass plate on which the membrane making liquid is poured into deionized water; 3) performing surface roughness treatment on the PEI / P25 membrane; 4) preparing hydrogen peroxide reaction liquid; 5) soaking the PEI / P25 composite membrane into the hydrogen peroxide reaction liquid to generate and cover a hydrogen titanate nanowire on the surface; 6) soaking the PEI / P25 membrane covered with the hydrogen titanate nanowire on the surface into hot water, converting and crystallizing the hydrogen titanate nanowire into titanium dioxide, and taking out and washingtitanium dioxide by using water. According to the preparation method disclosed by the invention, through a low-temperature crystallization technique, a titanium dioxide nanowire is grown on the surface of the PEI membrane, so that the hydrophilicity of the membrane is improved, and the membrane flux is improved while high truncation ratio is maintained at the same time. The membrane can be applied to the fields of photocatalytic pollution treatment and the like.

Description

technical field [0001] The invention belongs to the field of membrane separation and photocatalysis, relates to a modification technology of a polymer membrane, in particular to a surface-loaded titanium dioxide (TiO 2 ) Nanowire polyetherimide (PEI) photocatalytic ultrafiltration membrane preparation method. Background technique [0002] Membrane separation technology is widely used in water purification, seawater separation, material concentration and heavy metal filtration due to its advantages of good separation efficiency, small equipment size and convenient maintenance. Ideal membrane materials should have the following characteristics: good mechanical strength and flexibility; excellent stability under harsh conditions such as acid and alkali; fouling resistance; high selectivity; high flux can be maintained with only a small driving force, etc. . In practical applications, since there are often organic pollutants such as proteins in wastewater, after long-term filt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D61/14B01D71/64B01D15/08B01J31/38B01J21/06
CPCB01D15/08B01D61/145B01D67/0011B01D67/0081B01D67/0088B01D71/64B01J21/063B01J31/38B01D2325/10B01J35/59B01J35/39
Inventor 蒋锐吴进明
Owner ZHEJIANG UNIV
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