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Visible light responsive pucherite-graphene composite photocatalyst and preparation method thereof

A graphene composite and photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of limited photocatalytic activity, poor adsorption performance, energy The problem of narrow band gap and other problems can be achieved to improve the photocatalytic activity, improve the adsorption performance and the effect of large surface area

Active Publication Date: 2011-07-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The energy band gap of bismuth vanadate is relatively narrow, only 2.4eV, and it is considered as an ideal visible light catalyst, but due to its poor adsorption performance, photogenerated electrons and holes cannot be effectively separated, which limits its photocatalytic activity.

Method used

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  • Visible light responsive pucherite-graphene composite photocatalyst and preparation method thereof
  • Visible light responsive pucherite-graphene composite photocatalyst and preparation method thereof
  • Visible light responsive pucherite-graphene composite photocatalyst and preparation method thereof

Examples

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preparation example Construction

[0018] The preparation method of the bismuth vanadate-graphene composite photocatalyst of visible light response of the present invention comprises the following steps:

[0019] In the first step, graphite oxide is ultrasonically dispersed in a water and ethanol system, and the volume ratio of ethanol and water is 1:1;

[0020] In the second step, bismuth nitrate and ammonium metavanadate were stirred in equal volumes of ethanol for 20-50 minutes;

[0021] The third step is to mix the system obtained in the first step with the mixture obtained in the second step, adjust the mixed system to be alkaline, and stir for 30-60 minutes;

[0022] In the fourth step, the reaction system of the third step is transferred to a hydrothermal kettle for hydrothermal reaction, the reaction temperature is 180-200°C, and the reaction time is 5-8 hours;

[0023] In the fifth step, the product obtained in the fourth step is centrifuged, washed with deionized water, and dried to obtain a bismuth ...

Embodiment 1

[0026] Implementation example 1: the preparation method of the bismuth vanadate-graphene composite photocatalyst of visible light response of the present invention, comprises the following steps:

[0027] The first step is the preparation of graphite oxide. Add 10 g of graphite powder to potassium persulfate (5 g) and phosphorus pentoxide (5 g) in concentrated sulfuric acid solution (15 mL) at 80 ° C, pre-oxidize for 6 hours, then cool to room temperature, filter, and wash to medium sex. Add pre-oxidized graphite powder (10 g) into 230 mL of concentrated sulfuric acid solution at 0°C, then carefully add 30 g of potassium permanganate, then react at 35°C for 2 hours, and finally add 1L of deionized solution to the reaction solution Water and 25mL of 30% hydrogen peroxide terminated the reaction, filtered, washed, and dialyzed to obtain graphite oxide.

[0028] In the second step, 40 mg of graphite oxide was ultrasonically dispersed in 10 mL of ethanol and 10 mL of deionized w...

Embodiment 2

[0034] Implementation example 2: the preparation method of the bismuth vanadate-graphene composite photocatalyst of visible light response of the present invention, comprises the following steps:

[0035] The first step is the same as Step 1 in Implementation Example 1.

[0036] The second step is the same as step two in the implementation example 1.

[0037] In the third step, 0.1796 g of bismuth nitrate and 0.0430 g of ammonium metavanadate were respectively stirred in 10 mL of ethanol for 30 minutes.

[0038] In the fourth step, mix the second step with the third step, adjust the pH=8, and stir for 40 minutes.

[0039] In the fifth step, the reaction system in the fourth step was transferred to a 50 mL hydrothermal kettle, and reacted at 190° C. for 7 hours.

[0040] The sixth step is the same as step six in the implementation example 1.

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Abstract

The invention discloses a visible light responsive pucherite-graphene composite photocatalyst and a preparation method thereof. The composite photocatalyst is prepared by compositing pucherite and graphene according to the mass ratio of (1:2)-(1:5). The preparation method comprises the following steps of: putting graphite oxide into a mixed solution of water and ethanol for ultrasonic dispersion,respectively adding bismuth nitrate and ammonium metavanadate into ethanol for stirring, and finally mixing the three systems and regulating the pH to be greater than 7; then, transferring the mixed system into a hydrothermal kettle for reacting; and after the reaction is finished, centrifugally separating, washing and drying the product to obtain a leaf-shaped pucherite-graphene composite photocatalyst. In the invention, by using graphene as a template, the leaf-shaped pucherite-graphene composite photocatalyst is prepared by a hydrothermal synthesis method. The pucherite-graphene composite photocatalyst prepared by the method disclosed by the invention has better application prospect and economic benefit in the aspect of sewage treatment.

Description

technical field [0001] The invention belongs to the preparation technology of using graphene as a template and depositing leaf-shaped bismuth nitrate composite photocatalyst on its surface, in particular a bismuth vanadate-graphene composite photocatalyst responding to visible light and a preparation method thereof. Background technique [0002] As the problem of global environmental deterioration becomes more and more prominent, the effective control and governance of environmental pollution has become a major problem faced and solved by governments all over the world. Many new technologies have been tried to be applied to the control of environmental pollution, semiconductor photocatalysis technology is one of them. In the previous photocatalytic research process, titanium dioxide has been the most widely studied, but it only responds to ultraviolet light. From the perspective of making full use of sunlight, preparing a catalyst with photocatalytic activity under visible l...

Claims

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Application Information

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IPC IPC(8): B01J23/22
Inventor 汪信付永胜杨绪杰何光裕陈海群
Owner NANJING UNIV OF SCI & TECH
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