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Ternary heterojunction graphene-bismuth oxide/bismuth oxyhalide visible light photocatalyst and preparation method thereof

A technology of bismuth oxyhalide and photocatalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical instrument and method, etc. It can solve the problems of low photocatalytic efficiency of monomer BiOX and Bi2O3, and achieve improved photocatalytic performance , high-efficiency degradation, cheap and easy-to-get reagents

Pending Publication Date: 2020-03-27
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a ternary heterojunction graphene-bismuth oxide / bismuth oxyhalide visible light photocatalyst to solve the problem of low photocatalytic efficiency of monomer BiOX and Bi2O3

Method used

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  • Ternary heterojunction graphene-bismuth oxide/bismuth oxyhalide visible light photocatalyst and preparation method thereof
  • Ternary heterojunction graphene-bismuth oxide/bismuth oxyhalide visible light photocatalyst and preparation method thereof
  • Ternary heterojunction graphene-bismuth oxide/bismuth oxyhalide visible light photocatalyst and preparation method thereof

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Embodiment 1

[0050] Embodiment 1, the preparation method of a kind of ternary heterojunction graphene-bismuth oxide / bismuth oxyhalide visible light photocatalyst is as follows:

[0051] A. Dissolve 10mmol bismuth nitrate in 40mL, 4mol / L nitric acid solution, fully stir until dissolved, adjust the pH to 7 with 100mL, 1.9mol / L sodium hydroxide solution, stir magnetically at room temperature for 0.5 hours, filter, and then Washed several times with absolute ethanol and distilled water, the product was dried at 80°C for 4 hours, and then calcined at 500°C for 3 hours to obtain yellow bismuth oxide Bi 2 o 3 ;

[0052] B, get the Bi that 0.0075g graphite oxide and 3.0g step A make 2 o 3 , mixed and added to the mixed solution of deionized water and absolute ethanol (volume ratio 1:1), ultrasonically dispersed for 1h, the mixed solution was transferred to a polytetrafluoroethylene reactor at 120°C for 4h, then filtered, followed by Wash several times with absolute ethanol and distilled water,...

Embodiment 2

[0055] Embodiment 2, the preparation method of a kind of ternary heterojunction graphene-bismuth oxide / bismuth oxyhalide visible light photocatalyst is as follows:

[0056] A. Dissolve 10mmol bismuth nitrate in 40mL, 4mol / L nitric acid solution, fully stir until dissolved, adjust the pH to 7 with 100mL, 1.9mol / L sodium hydroxide solution, stir magnetically at room temperature for 2 hours, filter, and then Washed several times with absolute ethanol and distilled water, the product was dried at 50°C for 10 hours, and then calcined at 300°C for 10 hours to obtain yellow bismuth oxide Bi 2 o 3 ;

[0057] B, get the Bi that 0.0303g graphite oxide and 3.0g step A make 2 o 3 After mixing, add it to the mixed solution of deionized water and absolute ethanol (2:1 volume ratio), ultrasonically disperse for 0.5h, transfer the mixed solution to a polytetrafluoroethylene reactor at 80°C for 12h, and then filter. Wash with absolute ethanol and distilled water several times in sequence, ...

Embodiment 3

[0060] Embodiment 3, the preparation method of a kind of ternary heterojunction graphene-bismuth oxide / bismuth oxyhalide visible light photocatalyst is as follows:

[0061] A. Dissolve 10mmol bismuth nitrate in 40mL, 4mol / L nitric acid solution, fully stir until dissolved, adjust the pH to 7 with 100mL, 1.9mol / L sodium hydroxide solution, stir magnetically at room temperature for 1 hour, filter, and then Washed several times with absolute ethanol and distilled water, the product was dried at 100°C for 4 hours, and then calcined at 600°C for 3 hours to obtain yellow bismuth oxide Bi 2 o 3 ;

[0062] B, get the Bi that 0.75g graphite oxide and 3.0g step A make 2 o 3, mixed and added to the mixed solution of deionized water and absolute ethanol (volume ratio 3:1), ultrasonically dispersed for 2 hours, the mixed solution was transferred to a polytetrafluoroethylene reactor at 180°C for 2 hours, then filtered, followed by Wash several times with absolute ethanol and distilled w...

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Abstract

The invention discloses a ternary heterojunction graphene-bismuth oxide / bismuth oxyhalide visible light photocatalyst and a preparation method thereof, belongs to the field of catalysts, and solves the problem of low photocatalytic efficiency of monomers BiOX and Bi2O3. The photocatalyst is prepared from graphene, bismuth oxide and bismuth oxyhalide, wherein the graphene accounts for 0.25%-20% ofthe total mass of the catalyst. The preparation method comprises the following steps: dissolving bismuth nitrate in a nitric acid solution and adjusting the pH value to be neutral by using alkali liquor to prepare bismuth oxide; enabling graphite oxide to react with Bi2O3 to prepare Graphene-Bi2O3; and adding haloid acid into the Graphene-Bi2O3 and carrying out an ultrasonic reaction so as to obtain the Graphene-Bi2O3 / BiOX catalyst. According to the photocatalyst, the problem of high recombination rate of photo-induced electrons and carriers is solved and the photocatalytic performance is improved; the preparation method adopts a hydrothermal synthesis method, the steps are simple and the synthesis time is short.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a ternary heterojunction graphene-bismuth oxide / bismuth oxyhalide visible light photocatalyst and a preparation method thereof. Background technique [0002] Photocatalysis shows potential application prospects in directly using solar energy to solve environmental pollution and energy shortage problems. Photocatalyst is the core part of photocatalysis, research and development of visible photocatalyst with high activity has become a difficulty and hot spot in the field of photocatalysis. Among them, semiconductor photocatalysis technology is an environmentally friendly new catalytic technology. Semiconductor photocatalysts generate electron-hole pairs under light conditions. Photogenerated holes have strong oxidation ability and can capture electrons from organic matter on the surface of particles. OH¯ and H adsorbed on the semiconductor surface 2 O is oxidized to generate ...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J35/00B01J37/10
CPCB01J27/06B01J37/10B01J35/39
Inventor 王军伍水生高颖余江鸿王进龙张析吴斌周涛赵坤王源瑞焦晓斌王文昌单文杰张红
Owner NORTHWEST RES INST OF MINING & METALLURGY INST
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