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Method for synthesizing monoclinic phase and tetragonal phase mixed high-catalytic-activity bismuth vanadate powder by microwave hydrothermal process

A microwave hydrothermal method, high catalytic activity technology, applied in chemical instruments and methods, vanadium compounds, inorganic chemistry, etc. problem, to achieve the effect of improving the photocatalytic effect, short preparation period and low cost

Inactive Publication Date: 2011-11-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However mBiVO 4 The conduction band edge is located at 0v (vs. NHE), so that the energy of its photogenerated electrons is not enough to reduce H + , and its photogenerated electrons are not easily captured by oxygen in the air, so it will lead to the accumulation of photogenerated electrons on the surface of the catalyst, thereby increasing the recombination probability of electrons and holes, resulting in mBiVO 4 Poor efficiency in degrading organic matter under visible light
And the productive rate during preparation is very low, and this has also improved its preparation cost to a certain extent, has limited its further popularization practical application
[0004] Noble metal deposition, metal ion doping, non-metal ion doping, surface photosensitization and other methods have been used to modify monoclinic bismuth vanadate, but the above methods have the disadvantages of unstable performance and high cost.

Method used

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  • Method for synthesizing monoclinic phase and tetragonal phase mixed high-catalytic-activity bismuth vanadate powder by microwave hydrothermal process
  • Method for synthesizing monoclinic phase and tetragonal phase mixed high-catalytic-activity bismuth vanadate powder by microwave hydrothermal process
  • Method for synthesizing monoclinic phase and tetragonal phase mixed high-catalytic-activity bismuth vanadate powder by microwave hydrothermal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Add 0.002mol Bi(NO 3 ) 3 ·5H 2 O dissolved in 10 mL of HN0 with a concentration of 2 mol / L 3 solution, 0.002mol NH 4 VO 3 Dissolve in 10mL NaOH solution with a concentration of 2mol / L;

[0028] Step 2: Add 0.15 g of sodium dodecylbenzenesulfonate (SDBS) to the two solutions respectively, and stir for 30 minutes on a magnetic stirrer;

[0029] Step 3: Mix the two solutions evenly, stir on a magnetic stirrer for 30 minutes, and then adjust the pH to 6.07 with NaOH to prepare the precursor solution;

[0030] Step 4: 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 180°C, and the holding time to 60 minutes;

[0031] Step 5: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettle, wash it with deionized water until neutral, then wash it with absolute ethanol, and finall...

Embodiment 2

[0034] Step 1: Add 0.005mol Bi(NO 3 ) 3 ·5H 2 O dissolved in 10mL with a concentration of 4mol / LHNO 3 solution, 0.005mol NH 4 VO 3Dissolve in 10mL NaOH solution with a concentration of 4mol / L;

[0035] Step 2: Add 0.3 g of sodium dodecylbenzenesulfonate (SDBS) to the two solutions respectively, and stir on a magnetic stirrer for 50 min;

[0036] Step 3: Mix the two solutions evenly, stir on a magnetic stirrer for 10 minutes, and then adjust the pH to 7.6 with NaOH to prepare a precursor solution;

[0037] Step 4: 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 180°C, and the holding time to 60 minutes;

[0038] Step 5: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettle, wash it with deionized water until neutral, then wash it with absolute ethanol, and finally dry it at a c...

Embodiment 3

[0041] Step 1: Add 0.01mol Bi(NO 3 ) 3 ·5H 2 O dissolved in 10mL with a concentration of 6mol / LHNO 3 solution, 0.01mol NH 4 VO 3 Dissolve in 10mL NaOH solution with a concentration of 6mol / L;

[0042] Step 2: Add 0.2 g of sodium dodecylbenzenesulfonate (SDBS) to the two solutions respectively, and stir on a magnetic stirrer for 50 min;

[0043] Step 3: Mix the two solutions evenly, stir on a magnetic stirrer for 20 minutes, and then adjust the pH to 4.6 with NaOH to prepare the precursor solution;

[0044] Step 4: 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 210°C, and the holding time to 100 minutes;

[0045] Step 5: After the reaction is completed, cool down, take out the yellow precipitate in the reaction kettle, wash it with deionized water until neutral, then wash it with absolute ethanol, and finally dry it at a...

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Abstract

The invention discloses a method for synthesizing monoclinic phase and tetragonal phase blended high-catalytic-activity bismuth vanadate powder by a microwave hydrothermal process, and the method comprises: separately dissolving bismuth nitrate pentahydrate used as a bismuth source and ammonium metavanadate used as a vanadium source in a HNO3 solution and a NaOH solution with a molar ratio of Bi to V being 1:1, adding an appropriate amount of sodium dodecyl benzene sulfonate used as a template agent and NaOH used as a mineralizing agent, and controlling the pH value at 4.6-8.0, microwave hydrothermal reaction temperature at 160-220 DEG C and heat-insulation time at 60-120 minutes to synthesize the monoclinic phase and tetragonal phase blended BiVO4 powder. By adopting the microwave hydrothermal synthesis technique in the invention, high-photocatalytic-activity BiVO4 powder is quickly synthesized. The method as a novel environmentally-friendly rapid synthesis process combines the unique heating characteristics of microwave and the advantages of a hydrothermal method, the process is simple and easy to control, the preparation period is short, the energy is saved, and the resulting powder has uniform particle size distribution and very wide application prospects.

Description

【Technical field】 [0001] The invention belongs to the field of functional materials and relates to a method for synthesizing high-activity bismuth vanadate photocatalyst powder. 【Background technique】 [0002] Due to its unique structure and physical and chemical properties, bismuth vanadate has a wide range of applications in luminescent materials, ferroelectricity, piezoelectricity, etc., and has attracted the attention of many researchers. At present, researchers use bismuth vanadate as a heterogeneous photocatalyst, showing its unique and superior performance, especially for environmental pollution control and green energy. BiVO 4 There are three main crystal forms: tetragonal zircon, monoclinic scheelite structure and tetragonal scheelite structure. [0003] Monoclinic bismuth vanadate (mBiVO 4 ) has a band gap of 2.3-2.4eV, and its valence band oxidation potential is around 2.4eV. Currently mBiVO 4 It has been applied to the research of degrading pollutants, photol...

Claims

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Application Information

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