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Bismuth vanadate light catalyst for exposing high-activity crystal face and preparation method for bismuth vanadate light catalyst

A photocatalyst, bismuth vanadate technology, applied in chemical instruments and methods, physical/chemical process catalysts, vanadium compounds, etc., can solve the problems of low photocatalytic activity and insufficient exposure of high-activity crystal faces, and achieve good repeatability. , Good visible light response performance, the effect of short reaction period

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

AI Technical Summary

Problems solved by technology

[0015] The present invention aims to solve technical problems such as insufficient exposure of high-activity crystal planes and low photocatalytic activity of currently synthesized bismuth vanadate photocatalysts, and provides a bismuth vanadate photocatalyst with exposed high-activity crystal planes and a preparation method thereof. The bismuth vanadate photocatalyst can selectively expose highly active {010} crystal faces, has good visible light response performance and visible light photocatalytic activity, and shows excellent performance in degrading organic pollutants; the preparation method is simple, Low price and good repeatability

Method used

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  • Bismuth vanadate light catalyst for exposing high-activity crystal face and preparation method for bismuth vanadate light catalyst

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Effect test

Embodiment 1

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Step 5: centrifuge, wash with deionized water three times and absolute ethanol three times, and dry at 80° C. for 8 hours to obtain bismuth vanadate nanoparticles.

[0044] Depend on figure 1 It c...

Embodiment 2

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] The bismuth van...

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Abstract

The invention discloses a bismuth vanadate light catalyst for exposing a high-activity crystal face and a preparation method for the bismuth vanadate light catalyst. The bismuth vanadate light catalyst is a square corner cut double-cone body and can selectively expose the crystal face (010); a crystal phase is a monoclinic scheelite phase; and the particle size of the crystal phase is 500 nanometers to 3 microns. The preparation method comprises the following steps of: dissolving bismuth nitrate pentahydrate and ammonium metavanadate, which are same in molar weight, by dilute nitric acid and weak aqua ammonia, which are same in volume and concentration and are taken as solvents; under the condition of vigorous stirring, adding sodium dodecyl sulfate into a bismuth nitrate solution; then, mixing the bismuth nitrate solution and an ammonium metavanadate solution, stirring the mixed solution for a period of time, adjusting the pH value of the mixed solution to 6.5-8, crystallizing the mixed solution for 12-48 hours at 160-200 DEG C, and performing centrifugal washing and drying on a product, thus obtaining bismuth vanadate nano particles. By the simple hydrothermal synthesis preparation method, the operation is convenient, the reaction period is short, and the repetitiveness is high; and the prepared bismuth vanadate light catalyst has a good visible light response property and an excellent light catalysis property.

Description

technical field [0001] The invention relates to the field of inorganic nanometer photocatalyst material and its preparation, in particular to a bismuth vanadate photocatalyst with surfactant-assisted hydrothermal synthesis exposing a highly active {010} crystal plane and a preparation method thereof. Background technique [0002] With the continuous development of today's society, problems such as energy shortage and environmental pollution are becoming more and more serious; especially the problem of environmental pollution has seriously restricted the sustainable development of human society. How to use an efficient means to solve these problems is a major problem that mankind needs to face together. As we all know, solar energy is an inexhaustible energy source. If solar energy can be fully utilized, problems such as energy shortage and environmental pollution will be greatly alleviated. [0003] Many pollutants discharged by modern industry are difficult to be solved by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J35/10C01G31/00
Inventor 巩金龙李长江王胜平张鹏张冀杰王拓
Owner TIANJIN UNIV
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