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
CN102249305AInactive Publication Date: 2011-11-23SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Publication Date
2011-11-23
Estimated Expiration
Not applicable · inactive patent

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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.
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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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