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Method for preparing BiVO4 with photocatalytic performance under visible lights

A photocatalytic and visible light technology, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc., can solve problems such as the influence of photocatalytic performance, and achieve the effects of short reaction time, mild conditions and simple operation

Inactive Publication Date: 2013-03-13
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

BiVO 4 It is one of these composite metal oxide photocatalysts, which have been used in photolysis of water and degradation of mineralized organic pollutants, but its photocatalytic performance is affected by its crystal form

Method used

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  • Method for preparing BiVO4 with photocatalytic performance under visible lights
  • Method for preparing BiVO4 with photocatalytic performance under visible lights
  • Method for preparing BiVO4 with photocatalytic performance under visible lights

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step 1: Add 0.01mol Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, stirred on a magnetic stirrer for 30 min at room temperature, and 0.01mol NH 4 VO 3 Dissolve in deionized water at 100°C, heat and stir on a magnetic stirrer for 30 min, and keep the heating and stirring temperature constant at 45°C.

[0023] Step 2: Mix the two solutions prepared in step 1 evenly, stir on a magnetic stirrer for 20min, then add 5ml of NaOH solution with a concentration of 1mol / L, measure the pH value to 1.33, and stir on a magnetic stirrer for 30min to obtain Precursor solution;

[0024] Step 3: Put the precursor liquid into a polytetrafluoroethylene reactor with a filling ratio of 50%, then place the reactor in a microwave-assisted hydrothermal synthesizer, set the microwave hydrothermal reaction temperature to 200°C, and the holding time to be 40min;

[0025] Step 4: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettle, wash it...

Embodiment 2

[0028] Step 1: Add 0.01mol Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, stirred on a magnetic stirrer for 20 min at room temperature, and 0.01mol NH 4 VO 3 Dissolve in deionized water at 100°C, heat and stir on a magnetic stirrer for 20 minutes, and keep the heating and stirring temperature constant at 40°C.

[0029] Step 2: Mix the two solutions prepared in step 1 evenly, stir on a magnetic stirrer for 20min, then add 5ml of NaOH solution with a concentration of 4mol / L, measure the pH value to 2.55, stir on a magnetic stirrer for 30min, and obtain Precursor solution;

[0030] Step 3: Put the precursor solution into a polytetrafluoroethylene reactor with a filling ratio of 60%, and then place the reactor in a microwave-assisted hydrothermal synthesizer, set the microwave hydrothermal reaction temperature to 200°C, and hold the temperature for 40min;

[0031] Step 4: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettl...

Embodiment 3

[0034] Step 1: Add 0.01mol Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water, stirred on a magnetic stirrer for 30 min at room temperature, and 0.01mol NH 4 VO 3 Dissolve in deionized water at 100°C, heat and stir on a magnetic stirrer for 35 minutes, and keep the heating and stirring temperature constant at 40°C.

[0035] Step 2: Mix the two solutions prepared in step 1 evenly, stir on a magnetic stirrer for 10 minutes, then add 5ml of NaOH solution with a concentration of 6mol / L, measure the pH value to 9.18, stir on a magnetic stirrer for 30 minutes, and obtain Precursor solution;

[0036] Step 3: Put the precursor liquid into a polytetrafluoroethylene reactor with a filling ratio of 50%, then place the reactor in a microwave-assisted hydrothermal synthesizer, set the microwave hydrothermal reaction temperature to 200°C, and the holding time to be 40min;

[0037] Step 4: After the reaction is completed, cool down, take out the yellow precipitate in the reaction ket...

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Abstract

The invention discloses a method for preparing BiVO4 with photocatalytic performance under visible lights. The method comprises the steps that a bismuth-containing compound and a vanadium-containing compound are respectively dissolved in deionized water at first to be mixed, NaOH solution is then added so as to form precursor solution, the precursor solution is put in a polytetrafluoroethylene reactor to generate yellow precipitate, deionized water and absolute ethyl alcohol are finally used to wash, and drying is carried out to obtain BiVO4 powder. Concentrated nitric acid is not used as an inhibitor to inhibit the hydrolysis of Bi(NO3)3.5H2O when the precursor solution is prepared, but Bi(NO3)3.5H2O is directly dissolved in deionized water, so that the method has the characteristics of simplicity in operation, moderate conditions and short reaction time. The BiVO4 powders with different crystalline phases can be selectively prepared through regulating the pH value of the precursor solution, and the prepared powder has certain photocatalytic performance under visible lights.

Description

technical field [0001] The present invention relates to a BiVO with photocatalytic properties under visible light 4 The preparation method belongs to the field of functional materials. Background technique [0002] In recent years, the use of semiconductor photocatalytic technology to degrade wastewater and organic pollutants in the air has been actively studied. TiO 2 It has become an ideal photocatalyst due to its non-toxicity, high chemical stability and oxidation property. But TiO 2 Only responds to ultraviolet light, which accounts for 4% of solar energy, which greatly limits its application. In order to better utilize visible light, which accounts for 43% of sunlight, it is of great academic and practical significance to design and develop effective visible light photocatalysts. Therefore, researchers have designed many composite metal oxides as novel photocatalysts responsive to visible light, such as BiWO 6 、InVO 4 , AgAlO 2 、CaIn 2 o 4 Wait. BiVO 4 It is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00
Inventor 谈国强张丽丽魏莎莎
Owner SHAANXI UNIV OF SCI & TECH
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