Silver phosphate-bismuth vanadate multiplex photocatalyst and preparation method thereof

A photocatalyst, bismuth vanadate technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of insufficient modification means, high charge recombination rate, low photocatalytic efficiency, etc. Achieve the effects of good visible light response performance, improved light response performance, and reduced recombination rate

Active Publication Date: 2013-08-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The present invention aims to solve technical problems such as high charge recombination rate, low photocatalytic efficiency and insufficient modification means of current bismuth vanadate materials as photocatalysts, and provides a silver phosphate-bismuth vanadate composite photocatalyst and its preparation method , the composite photocatalyst has good visible light response performance, and its photocatalytic degradation performance is excellent, and it can rapidly degrade the methylene blue dye solution in a short time range; at the same time, the preparation method of the composite catalyst is simple, low in price and Good repeatability and other characteristics

Method used

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  • Silver phosphate-bismuth vanadate multiplex photocatalyst and preparation method thereof
  • Silver phosphate-bismuth vanadate multiplex photocatalyst and preparation method thereof
  • Silver phosphate-bismuth vanadate multiplex photocatalyst and preparation method thereof

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Effect test

Embodiment 1

[0046] The first step: take 2.5mmol Bi(NO 3 ) 3 ·5H 2 Dissolve O in 50ml of dilute nitric acid solution (2M), add 0.5g of sodium dodecylsulfonate, stir for 60min to dissolve completely, and record it as solution A.

[0047] The second step: take 2.5mmol NH 4 VO 3 Dissolve in 50ml dilute ammonia solution (2M), stir for 60min to dissolve completely, and record it as solution B.

[0048] Step 3: Add solution A to solution B under vigorous stirring, continue stirring for 30 minutes, then slowly adjust the pH to 7 with ammonia solution, and continue stirring for 30 minutes.

[0049] Step 4: Transfer the obtained mixed solution into a crystallization kettle with a polytetrafluoroethylene liner, keep it at 180° C. for 24 hours, and cool it down to room temperature naturally.

[0050] Step 5: Centrifuge, wash three times with deionized water and three times with absolute ethanol, and dry at 80°C for 8 hours to obtain BiVO 4 nanoparticles.

[0051] Step 6: Add 1mmol BiVO 4 Disp...

Embodiment 2

[0061] The first step: take 2.5mmol Bi(NO 3 ) 3 ·5H 2 Dissolve O in 60ml of dilute nitric acid solution (4M), add 0.65g of sodium dodecylsulfonate, stir for 30min to dissolve completely, and record it as solution A.

[0062] The second step: take 2.5mmol NH 4 VO 3 Dissolve in 60ml of dilute ammonia solution (4M), stir for 30min to dissolve completely, and record it as solution B.

[0063] Step 3: Add solution A to solution B under vigorous stirring, continue stirring for 30 minutes, then slowly adjust the pH to 8 with ammonia solution, and continue stirring for 120 minutes.

[0064] Step 4: Transfer the obtained mixed solution to a crystallization kettle with a polytetrafluoroethylene liner, keep it at 200° C. for 48 hours, and cool it down to room temperature naturally.

[0065] Step 5: centrifugation, washing with deionized water three times and absolute ethanol three times respectively, and drying at 100° C. for 12 hours to obtain bismuth vanadate nanoparticles.

[00...

Embodiment 3

[0075] The first step: take 2.5mmol Bi(NO 3 ) 3 ·5H 2 Dissolve O in 40ml of dilute nitric acid solution (1M), add 0.45g of sodium dodecylsulfonate, stir for 40min to dissolve completely, and record it as solution A.

[0076] The second step: take 2.5mmol NH 4 VO 3 Dissolve in 40ml of dilute ammonia solution (1M), stir for 40min to dissolve completely, and record it as solution B.

[0077] Step 3: Add solution A to solution B under vigorous stirring, continue stirring for 30 minutes, then slowly adjust the pH to 6.5 with ammonia solution, and continue stirring for 60 minutes.

[0078] Step 4: Transfer the obtained mixed solution to a crystallization kettle with a polytetrafluoroethylene liner, keep it at 160° C. for 12 hours, and cool it down to room temperature naturally.

[0079] Step 5: centrifuge, wash three times with deionized water and three times with absolute ethanol, and dry at 60° C. for 6 hours to obtain bismuth vanadate nanoparticles.

[0080] Step 6: Add 1mm...

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Abstract

The invention discloses a silver phosphate-bismuth vanadate multiplex photocatalyst and a preparation method thereof. According to the silver phosphate-bismuth vanadate multiplex photocatalyst, silver phosphate nanoparticles are selectively deposited on the {010} crystal face of bismuth vanadate, the particle size of bismuth vanadate nanoparticles is 500nm-3mu m, the particle size of silver phosphate nanoparticles is 10-100nm, and the molar ratio of silver phosphate to bismuth vanadate is (1:5)-(1:20). The preparation method comprises the following steps of: firstly, dispersing a bismuth vanadate photocatalyst into deionized water; adding a water-solubility silver-bearing raw material and stirring till the water-solubility silver-bearing raw material is completely dissolved; adding a precursor containing phosphate radical and regulating the pH value; and finally, stirring the solution for 5-10hours, centrifuging, then washing and drying to obtain the final product. The silver phosphate-bismuth vanadate multiplex photocatalyst has excellent visible-light response performance and outstanding photocatalytic degradation performance and is capable of quickly degrading methylene blue dye solution within a very short time; and moreover, the preparation method of the silver phosphate-bismuth vanadate multiplex photo-catalyst is simple and easy, low in cost and good in repeatability.

Description

technical field [0001] The invention relates to the field of inorganic nano photocatalyst materials, in particular to a composite photocatalyst and a preparation method thereof. Background technique [0002] At present, the main energy used by countries in the world is fossil energy, which is a non-renewable energy. Its excessive use has caused a serious energy crisis, and it has also caused increasingly serious environmental pollution problems. Energy shortage and environmental pollution are two great challenges facing the world today, seriously restricting the sustainable development of human beings. Solar energy has the advantages of being inexhaustible, clean and pollution-free. If solar energy can be fully utilized, the above two challenges can be easily solved. Therefore, how to efficiently convert solar energy into usable energy forms is a major issue with far-reaching significance. [0003] The research in the past thirty years has fully demonstrated that the use o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198
Inventor 巩金龙李长江王胜平张鹏张冀杰王拓
Owner TIANJIN UNIV
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