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Titanium dioxide/bismuth vanadate multiphase composite heterojunction nano photocatalytic material preparation method

A composite heterojunction and titanium dioxide technology, which is applied in the field of preparation of multi-heterojunction composite photocatalytic materials, can solve problems such as insufficient response in the visible light region, and achieve the effects of wide application range, long-lasting photocatalytic performance, and simple preparation method

Inactive Publication Date: 2016-01-13
冯冠华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the patent with the notification number CN102350332, a composite titanium dioxide photocatalyst containing rutile / anatase was prepared, which can effectively enhance the separation efficiency of electrons and holes and improve the photocatalytic performance, but its disadvantage is that it responds in the visible light region insufficient
[0006] In the patent with the notification number CN201110441592.7, a composite visible light-responsive catalyst of anatase titanium dioxide / bismuth vanadate was prepared, but it only contained one heterojunction, and its photocatalytic efficiency was not as high as that of multiple heterojunctions. high material

Method used

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  • Titanium dioxide/bismuth vanadate multiphase composite heterojunction nano photocatalytic material preparation method
  • Titanium dioxide/bismuth vanadate multiphase composite heterojunction nano photocatalytic material preparation method
  • Titanium dioxide/bismuth vanadate multiphase composite heterojunction nano photocatalytic material preparation method

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Experimental program
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Effect test

Embodiment 1

[0032] (1) Add 42 mol of distilled water to titanyl sulfate with a titanium content of 0.06 mol, stir vigorously for 30 minutes, add 0.45 mol of ammonia water dropwise, and stir vigorously at the same time, and continue stirring for 30 minutes after the dropwise addition. Wash and filter with deionized water for 4 times, dilute with 21 mol of distilled water, and stir vigorously to disperse. Add 30wt%H dropwise 2 o 2 0.66mol, and vigorously stir at the same time, and continue to stir for 60min after the dropwise addition. It was stable for 2 hours, and a yellow transparent 0.15 mol / L peroxotitanic acid solution A was obtained.

[0033] (2) 0.01g of TritonX-100, 0.16mol of absolute ethanol, after mixing, magnetically stir for 5min. Then weigh 0.3 g of rutile powder, slowly add it into the beaker in small amounts several times, stir strongly with magnetic force, and after 20 minutes, the suspension dispersion liquid B of rutile is obtained.

[0034] (3) Bi (NO 3 ) 3 ·5H 2...

Embodiment 2

[0038] (1) Add 42 mol of distilled water to titanyl sulfate with a titanium content of 0.06 mol, stir vigorously for 30 minutes, add 0.45 mol of ammonia water dropwise, and stir vigorously at the same time, and continue stirring for 30 minutes after the dropwise addition. Wash and filter with deionized water for 4 times, dilute with 21 mol of distilled water, and stir vigorously to disperse. Add 30wt%H dropwise 2 o 20.66mol, and vigorously stir at the same time, and continue to stir for 60min after the dropwise addition. It was stable for 2 hours, and a yellow transparent 0.15 mol / L peroxotitanic acid solution A was obtained.

[0039] (2) Bi (NO 3 ) 3 ·5H 2 O-acetic acid solution to make Bi(NO 3 ) 3 ·5H 2 O is completely dissolved; then configure VO(acac) at 0.03mol / L 2 -Acetylacetone solution to make VO(acac) 2 completely dissolved. Finally, the two metal precursors were mixed according to the stoichiometric molar ratio Bi / V=1:1, and stirred vigorously for 1.5 h to...

Embodiment 3

[0043] (1) Bi (NO 3 ) 3 ·5H 2 O-acetic acid solution to make Bi(NO 3 ) 3 ·5H 2 O is completely dissolved; then configure VO(acac) at 0.03mol / L 2 -Acetylacetone solution to make VO(acac) 2 completely dissolved. Finally, the two metal precursors were mixed according to the stoichiometric molar ratio Bi / V=1:1, and stirred vigorously for 1.5 h to obtain a dark blue-green transparent 0.028 mol / L solution C.

[0044] (2) 6g of C was coated on the surface of a clean heat-resistant substrate, then heated to 500°C, kept for 1h, and cooled to room temperature.

[0045] (3) Carry out the methylene blue decolorization test, irradiate 3mg / L methylene blue with 254nm ultraviolet light for 5min, and the decolorization rate of three consecutive concentrations reaches 51.14%, 47.83% and 37.12%, respectively.

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Abstract

The present invention relates to a titanium dioxide / bismuth vanadate multiphase composite heterojunction nano photocatalytic material preparation method, comprising: (1) preparing a peroxo titanic acid solution via an inorganic titanium source; (2) using a dispersant and a solvent to physically prepare a dispersion with pure nano rutile powder; (3) preparing a bismuth vanadate solution; and (4) stirring and mixing the three liquids proportionately, coating the stirred and mixed liquid onto the surface of a clean and heat-resistant substrate, heating the substrate to 500 DEG C, keeping the temperature for 1h, and then cooling the substrate to room temperature, thereby obtaining a titanium dioxide / bismuth vanadate multiphase composite heterojunction nano photocatalytic material. The preparation method of the present invention is simple, and low in costs of raw materials. The material has good photocatalytic performance, has photocatalytic effects in the visible-light range, is good in dispersibility, and is wide in application.

Description

technical field [0001] The invention belongs to the field of preparation of multi-heterojunction composite photocatalytic materials, and in particular relates to a preparation method of titanium dioxide / bismuth vanadate heterogeneous composite heterojunction nanometer photocatalytic materials. Background technique [0002] In recent years, people pay more and more attention to environmental issues, and pay more attention to the research of various environmental protection materials, among which photocatalytic materials are one of the research and development hotspots. Titanium dioxide photocatalytic materials have been studied most because of their high safety, high stability, and efficient degradation of pollutants. Functional photocatalytic materials made by combining titanium dioxide with various substrates in different ways have played a significant role in water and air purification. [0003] In the field of photocatalytic material design, in order to further improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22
Inventor 冯冠华仇健李澄
Owner 冯冠华
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