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Bismuth oxyiodide-bismuth vanadium oxide heterojunction photocatalyst and preparation method thereof

A technology of bismuth oxyiodide and photocatalyst, which is applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of poor adsorption and low separation efficiency of photogenerated carriers, and achieve low cost, The preparation method is simple and easy to operate, and the effect of inhibiting recombination

Inactive Publication Date: 2015-12-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the monoclinic scheelite type has the best photocatalytic activity, but its separation efficiency of photogenerated carriers is low due to poor adsorption.

Method used

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  • Bismuth oxyiodide-bismuth vanadium oxide heterojunction photocatalyst and preparation method thereof
  • Bismuth oxyiodide-bismuth vanadium oxide heterojunction photocatalyst and preparation method thereof
  • Bismuth oxyiodide-bismuth vanadium oxide heterojunction photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The first step: take 0.01mol (4.8507g) Bi(NO 3 ) 3 ·5H 2 O and 0.02mol (4.2g) C 6 h 8 o 7 ·H 2 Dissolve O in 50mL of 1mol / L dilute nitric acid, stir for 30min to dissolve completely, add ammonia water to adjust the pH value to 7, and record it as solution A;

[0038] The second step: take 0.01mol (1.1698g) NH 4 VO 3 and 0.02mol (4.2g) C 6 h 8 o 7 ·H 2 Dissolve O in 50mL of distilled water, stir for 30min to dissolve completely, and record it as solution B;

[0039] Step 3: After stirring solution B at 80°C for 40 minutes, the solution will turn from orange yellow to dark green, then slowly add solution A and mix to form solution C;

[0040] Step 4: Take 0.001mol (0.4851g) Bi(NO 3 ) 3 ·5H 2 O is dissolved in 15ml ethylene glycol, and is recorded as D solution;

[0041] Step 5: Take 0.001mol (0.166g) of KI and dissolve it in 50mL of distilled water, and record it as E solution;

[0042] Step 6: After mixing solution D and solution E for 15 hours, add it to ...

Embodiment 2

[0049] The first step: take 0.01mol (4.8507g) Bi(NO 3 ) 3 ·5H 2 O and 0.02mol (4.2g) C 6 h 8 o 7 ·H 2 Dissolve O in 50mL of 1mol / L dilute nitric acid, stir for 30min to dissolve completely, add ammonia water to adjust the pH value to 7.1, and record it as solution A;

[0050] The second step: take 0.01mol (1.1698g) NH 4 VO 3 and 0.02mol (4.2g) C 6 h 8 o 7 ·H 2 Dissolve O in 50mL of distilled water, stir for 30min to dissolve completely, and record it as solution B;

[0051] Step 3: After stirring solution B at 80°C for 40 minutes, the solution will turn from orange yellow to dark green, then slowly add solution A and mix to form solution C;

[0052] The fourth step: take 0.005mol (2.4254g) Bi(NO 3 ) 3 ·5H 2 O is dissolved in 20ml ethylene glycol, and is recorded as D solution;

[0053] Step 5: Dissolve 0.005mol (0.83g) KI into 50mL distilled water, and record it as E solution;

[0054] Step 6: After mixing solution D and solution E for 18 hours, add it to the ...

Embodiment 3

[0061] The first step: take 0.01mol (4.8507g) Bi(NO 3 ) 3 ·5H 2 O and 0.01mol (2.1g) C 6 h 8 o 7 ·H 2 Dissolve O in 40mL of 1mol / L dilute nitric acid, stir for 20min to dissolve completely, add ammonia water to adjust the pH value to 6.5, and record it as solution A;

[0062] The second step: take 0.01mol (1.1698g) NH 4 VO 3 and 0.01mol (2.1g) C 6 h 8 o 7 ·H 2 O was dissolved in 40mL of distilled water, stirred for 20min to completely dissolve, and recorded as B solution;

[0063] Step 3: After stirring solution B at 60°C for 50 minutes, the solution will turn from orange yellow to dark green, then slowly add solution A and mix to form solution C;

[0064] The fourth step: take 0.0005mol (0.2425g) Bi(NO 3 ) 3 ·5H 2 O is dissolved in 10ml of ethylene glycol, which is recorded as D solution;

[0065] Step 5: Dissolve 0.0005mol (0.083g) KI into 40mL distilled water, and record it as E solution;

[0066]Step 6: After mixing solution D and solution E for 12 hours, ...

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Abstract

The invention belongs to the technical field of semiconductor photocatalysis, and discloses a bismuth oxyiodide-bismuth vanadium oxide heterojunction photocatalyst and a preparation method thereof. The photocatalyst is a heterostructure formed by combination of bismuth oxyiodide ad bismuth vanadium oxide, and bismuth vanadium oxide nanoparticles are uniformly dispersed on bismuth oxyiodide nanoparticle surfaces. The preparation method comprises firstly dissolving bismuth nitrate pentahydrate and citric acid in diluted nitric acid and adjusting pH value, dissolving ammonium metavanadate and citric acid in distilled water and heating, and mixing the two solutions; and dissolving bismuth nitrate pentahydrate in glycol, dissolving potassium iodide KI in distilled water, mixing the two solutions and putting into the above mixed solutions, stirring, ageing, drying, calcining and grinding, so as to obtain the heterojunction photocatalyst. The synthesized photocatalyst possesses the typical heterostructure, possesses the characteristics of inhibiting electron-cavity recombination and effectively promoting carrier separation, and compared with a monomer bismuth vanadium oxide, the synthesized photocatalyst is relatively wide in photoresponse scope and relatively good in catalytic activity and stability.

Description

technical field [0001] The invention belongs to the technical field of semiconductor photocatalysis, and specifically relates to a heterojunction photocatalyst and a preparation method thereof. Background technique [0002] As environmental pollution and energy shortage become more and more serious, photocatalytic technology has attracted much attention in the fields of air purification, sewage treatment, sterilization, and hydrogen production due to its economical, environmental protection, and thorough degradation characteristics. with TiO 2 The representative traditional photocatalytic materials have been widely studied because of their stability, low price, non-toxicity and good catalytic activity. However, due to the wide band gap of photocatalysts, they can only have catalytic activity in the ultraviolet region, which greatly limits Applications in various fields. [0003] Bismuth vanadate is a non-titanium dioxide-based visible light photocatalytic material with a b...

Claims

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Application Information

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IPC IPC(8): B01J27/06C02F1/30
CPCY02W10/37
Inventor 王永强刘思瑶刘芳赵朝成赵东风李石
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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