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Preparation method of photocatalytic ultrafilter membrane material with visible light activity

An ultrafiltration membrane and visible light technology, applied in the field of photocatalytic materials, can solve the problems of easy loss of TiO2, the invasion of nanoparticles into the human body and other species, and limit the application of titanium dioxide photocatalysis, so as to promote the transfer and transfer of electrons and improve hydrophilicity and anti-pollution properties, and the effect of improving the photocatalytic effect

Inactive Publication Date: 2017-04-26
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitations of the structure of titanium dioxide itself, such as the large bandgap of titanium dioxide, it can only be excited by ultraviolet light with a wavelength less than 387.5nm, while ultraviolet light in sunlight only accounts for about 4%; and the bulk of titanium dioxide photogenerated electron-holes The probability of phase recombination and surface recombination is very high, so that the photogenerated electrons-holes cannot effectively participate in the redox reaction, and its quantum efficiency is not higher than 20%, so the utilization efficiency of sunlight is only 1%.
These shortcomings greatly limit the practical application of titanium dioxide photocatalysis
[0003] Currently, TiO 2 The preparation is often nano-sized, nano-TiO 2 Due to the quantum effect, small size effect, surface effect and interface effect, it shows good photocatalytic performance, but nano-sized TiO 2 It is also easy to lose in the process of water treatment, and its recovery is difficult, and nanoparticles are likely to invade the natural defense system of the human body and other species, enter cells and destroy the function of cells, with nano toxicity

Method used

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  • Preparation method of photocatalytic ultrafilter membrane material with visible light activity
  • Preparation method of photocatalytic ultrafilter membrane material with visible light activity

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Experimental program
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Effect test

Embodiment 1

[0025] Such as Figure 1 ~ Figure 2 Shown, a kind of preparation method of photocatalytic ultrafiltration membrane material with visible light activity comprises the following steps:

[0026] (1) Preparation of N-TiO 2 Powder: Mix 10ml of butyl titanate with 40ml of absolute ethanol to form solution A, mix 0.486g of urea, 10ml of absolute ethanol, 4ml of pure water and 2ml of glacial acetic acid, and adjust the pH to 2 to form solution B. Add solution B to solution A drop by drop, continue to stir for 30 minutes to make it completely mixed, let it stand for about 3 hours to form a gel, put it in a blast drying oven for 24 hours at 100°C, grind it after cooling, put it in Heating to 500°C for 2 hours in a resistance furnace at a rate of 2°C / min, then taking it out after natural cooling to obtain N-TiO 2 powder.

[0027] (2) Preparation of N-TiO 2 / GO particles: measure 0.025g GO and pour it into 100mL pure water, ultrasonically oscillate to make it evenly dispersed, then me...

Embodiment 2

[0033] The difference between this embodiment and embodiment 1 is only:

[0034] The volume ratio of butyl titanate to absolute ethanol in solution A in S01 is 1:6, the volume ratio of absolute ethanol in solution B to butyl titanate in solution A is 1:0.5, pure water and butyl titanate The volume ratio of glacial acetic acid to butyl titanate is 1:2, the volume ratio of glacial acetic acid to butyl titanate is 1:4, the mass ratio of urea to butyl titanate is 1:8, and the solution used to adjust pH is 6mol / L hydrochloric acid. The pH is 1.5.

[0035] The temperature during drying in S01 was 60°C, and during calcination, the temperature was raised to 500°C for 2 hours at a rate of 1°C / min.

[0036] GO and N-TiO in S02 2 The mass ratio of the powder is 1:19, the high temperature environment is 150° C., and the reaction time is 12 hours.

[0037] The mass percentage of polysulfone, N-methylpyrrolidone and polyvinylpyrrolidone is 15.6:84:0.4.

[0038] The thickness of the film...

Embodiment 3

[0041] The difference between this embodiment and embodiment 1 is only:

[0042] The volume ratio of butyl titanate in solution A to absolute ethanol in S01 is 1:5, the volume ratio of absolute ethanol in solution B to butyl titanate in solution A is 1:0.8, and pure water and butyl titanate The volume ratio of glacial acetic acid to butyl titanate is 1:3, the volume ratio of glacial acetic acid to butyl titanate is 1:6, the mass ratio of urea to butyl titanate is 1:15, and the solution used to adjust pH is 6mol / L hydrochloric acid. The pH is 2.2.

[0043] The drying temperature in S01 was 150°C, and the temperature was raised to 500°C for 2 hours at a rate of 3°C / min during calcination.

[0044] GO and N-TiO in S02 2 The mass ratio of the powder is 1:19, the high temperature environment is 200° C., and the reaction time is 20 h.

[0045] The mass percentage of polysulfone, N-methylpyrrolidone and polyvinylpyrrolidone is 20:78:2.

[0046] The thickness of the film applicato...

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Abstract

The invention discloses a preparation method of a photocatalytic ultrafilter membrane material with visible light activity. The method comprises the following steps: 1, preparing N-TiO2 powder; 2, preparing N-TiO2 / GO particles; 3, preparing an ultrafilter membrane; and 4, producing an ultrafilter membrane with the surface loaded with N-TiO2 / GO: processing the N-TiO2 / GO particles to prepare an N-TiO2 / GO dispersion, tiling the ultrafilter membrane on a suction filtration device, pouring the N-TiO2 / GO dispersion, carrying out vacuum pumping, and airing the obtained membrane to obtain the ultrafilter membrane with the surface loaded with N-TiO2 / GO. The photocatalytic material with the advantages of visible light activity, hydrophilic property and difficulty in loss of nano-particles is obtained through the preparation method of the photocatalytic ultrafilter membrane material with visible light activity.

Description

technical field [0001] The invention relates to a preparation method of a photocatalytic ultrafiltration membrane material with visible light activity, and belongs to the technical field of photocatalytic materials. Background technique [0002] The photocatalyst represented by titanium dioxide has the advantages of high photocatalytic activity, good stability, strong light corrosion resistance, low cost, harmless to the human body, and photocatalytic reaction can be carried out under normal temperature and pressure. Pollution control has good effects, so it is getting more and more attention. However, due to the limitations of the structure of titanium dioxide itself, such as the large bandgap of titanium dioxide, it can only be excited by ultraviolet light with a wavelength less than 387.5nm, while ultraviolet light in sunlight only accounts for about 4%; and the bulk of titanium dioxide photogenerated electron-holes The probability of phase recombination and surface reco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01J20/26B01J20/28B01J31/38B01J20/30
CPCB01D67/0079B01D69/02B01D71/68B01J20/06B01J20/20B01J20/264B01J20/28033B01J31/38B01D2325/36B01J35/39
Inventor 陈卫叶挺许航耿楠楠陈桃源王聪颖张孝忠
Owner HOHAI UNIV
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