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A method for synthesizing monoclinic bismuth vanadate photocatalyst powder by microwave hydrothermal method

A monoclinic bismuth vanadate, microwave hydrothermal method, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. Uniformity, large temperature gradient, etc., to achieve the effects of short preparation cycle, energy saving, and uniform particle size distribution

Active Publication Date: 2011-12-14
南通通途机电制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional hydrothermal synthesis method, the common conduction heating method is often used. This heating method has the disadvantages of slow heating rate, long reaction time, uneven heat distribution, and large temperature gradient, which seriously affects the synthetic powder. properties, particle size, etc.

Method used

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  • A method for synthesizing monoclinic bismuth vanadate photocatalyst powder by microwave hydrothermal method
  • A method for synthesizing monoclinic bismuth vanadate photocatalyst powder by microwave hydrothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Add 0.005mol Bi(NO 3 ) 3 ·5H 2 O dissolved in 20mL with a concentration of 2mol / L HNO 3 solution, 0.005mol NH 4 VO 3 Dissolve in 20mL NaOH solution with a concentration of 1mol / L;

[0029] Step 2: Mix the two solutions in step 1 evenly, stir on a magnetic stirrer for 10 minutes, and prepare a precursor solution;

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

[0031] Step 4: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettle, wash with deionized water until neutral, then wash with absolute ethanol, and finally dry at a constant temperature at 80°C to obtain monoclinic phase BiVO 4 Powder.

[0032] Measure the phase composition and structure of the powder prepared in Example 1 with XRD, measure the ...

Embodiment 2

[0034] Step 1: Add 0.005mol Bi(NO 3 ) 3 ·5H2 O dissolved in 20mL with a concentration of 4mol / L HNO 3 solution, 0.005mol NH 4 VO 3 Dissolve in 20mL NaOH solution with a concentration of 2mol / L;

[0035] Step 2: Mix the two solutions evenly, stir on a magnetic stirrer for 20 minutes, and prepare a precursor solution;

[0036] Step 3: Add the precursor solution into the microwave hydrothermal reactor with a filling ratio of 60%, then place the reactor in a microwave-assisted hydrothermal synthesizer, set the reaction temperature to 180°C, and the holding time to 90 minutes;

[0037] Step 4: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettle, wash with deionized water until neutral, then wash with absolute ethanol, and finally dry at a constant temperature at 80°C to obtain monoclinic phase BiVO 4 Powder.

Embodiment 3

[0039] Step 1: Add 0.002mol Bi(NO 3 ) 3 ·5H 2 O dissolved in 20mL with a concentration of 6mol / L HNO 3 solution, 0.002mol NH 4 VO 3 Dissolve in 20mL NaOH solution with a concentration of 4mol / L;

[0040] Step 2: Mix the two solutions in step 1 evenly, stir on a magnetic stirrer for 30 minutes, and prepare a precursor solution;

[0041] Step 3: Add the precursor solution into the microwave hydrothermal reactor with a filling ratio of 50%, then place the reactor in a microwave-assisted hydrothermal synthesizer, set the reaction temperature to 220°C, and the holding time to 120min;

[0042] Step 4: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettle, wash with deionized water until neutral, then wash with absolute ethanol, and finally dry at a constant temperature at 80°C to obtain monoclinic phase BiVO 4 Powder.

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Abstract

The invention discloses a method for synthesizing monoclinic-phase bismuth vanadate photocatalyst powder by using a microwave hydrothermal synthesis technology. The method comprises separately dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) used as a bismuth source and ammonium metavanadate (NH4VO3) used as a vanadium source in HNO3 and NaOH solution at a ratio of Bi to V of 1:1, and synthesizing monoclinic-phase BiVO4 powder at the reaction temperature of 160-220 DEG C and heat-insulation time of 60-120 minutes by using a microwave hydrothermal method. In the method disclosed by the invention, monoclinic-phase BiVO4 powder with photocatalytic activity is rapidly synthesized by using the microwave hydrothermal synthesis technology. The method simultaneously has the unique characteristics of microwave heating and the advantages of the hydrothermal method, the obtained powder has uniform particle size distribution, the process is simple and easy to control, the preparation period is short, the energy is saved and the obtained monoclinic-phase BiVO4 powder has very wide application prospects.

Description

【Technical field】 [0001] The invention belongs to the field of functional materials and relates to a method for synthesizing monoclinic bismuth vanadate photocatalyst powder. 【Background technique】 [0002] As a new type of environmental pollutant reduction technology, semiconductor photocatalysis technology uses the surface of semiconductor oxide materials to be activated under light, effectively oxidizes and decomposes organic matter, reduces heavy metal ions and other characteristics, antibacterial and odor removal. In the photocatalytic research reported at home and abroad, TiO 2 With its excellent photocatalytic performance, it has attracted people's attention and has become the most important photocatalyst in recent decades. However, due to its wide bandgap (3.2eV), it can only be excited by ultraviolet light with a short wavelength, which greatly limits the TiO 2 Applications. [0003] BiVO 4 As a non-TiO 2 The new environment-friendly semiconductor photocatalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00B01J23/22B01J37/10
Inventor 谈国强魏莎莎
Owner 南通通途机电制造有限公司
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