Preparation method of vanadium-nitrogen co-doped tio2 photocatalyst

A photocatalyst and co-doping technology, which is applied in the field of photocatalytic materials, can solve the problems of poor photocatalytic activity and unstable catalytic performance of photocatalysts, and achieve the effects of less TiO2 doping, excellent degradation performance, and easy control

Active Publication Date: 2011-12-28
NATURAL ENERGY INST GANSU ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Synthesis of vanadium nitrogen co-doped TiO by particle method 2 In the method, the conventional method is to add vanadium source and nitrogen source to the aqueous solution, and then drop the mixture of titanium precursor and alcohol solvent into the aqueous solution ...

Method used

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  • Preparation method of vanadium-nitrogen co-doped tio2 photocatalyst
  • Preparation method of vanadium-nitrogen co-doped tio2 photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1, accurately weigh 0.0018g ammonium metavanadate in a 50ml flask, add 5ml absolute ethanol, 0.3ml diethanolamine, 7ml butyl titanate, and add 0.1ml acetic acid, magnetically stir for 3h, make metavanadate Dissolve ammonium evenly; slowly drop into the mixture of 100ml of water and 15ml of acetic acid under ice-water bath and strong stirring, continue to stir for 1h after the dropwise addition, and put the reaction solution in a water bath at 328K for 24h, and then dry it at 373K. The final solid is ground to below 100 mesh, calcined at 723K for 3 hours, and the calcined powder is ground to below 100 mesh for later use to obtain vanadium-nitrogen co-doped TiO 2 . The resulting vanadium-nitrogen co-doped TiO 2 The degradation rate of phenol was 82.12%.

Embodiment 2

[0030] Accurately weigh 0.0060g of vanadium tetrachloride into a 50ml flask, add 12ml of absolute ethanol, 0.2ml of diethanolamine, 5ml of butyl titanate, and add 0.1ml of acetic acid, and stir magnetically for 3 hours to evenly dissolve vanadium tetrachloride; Under ice-water bath and strong stirring, slowly drop into the mixed solution of 90ml water and 5ml acetic acid, continue to stir for 3h, the reaction solution is in a water bath at 338K for 15h, and then dried at 373K, and the dried solid is ground to 100 mesh Next, calcined at 623K for 3 hours, and ground the calcined powder to below 100 mesh to obtain vanadium-nitrogen co-doped TiO 2 , the resulting vanadium-nitrogen co-doped TiO 2 The degradation rate of phenol was 74.10%.

Embodiment 3

[0032]Accurately weigh 0.0125g of vanadium pentachloride in a 50ml flask, add 20ml of absolute ethanol, 0.5ml of diethanolamine, 7ml of butyl titanate, and add 0.1ml of sulfuric acid with a concentration of 0.1mol / L, and magnetically stir for 1h to make Vanadium pentachloride is uniformly dissolved in the solution, and the above mixed solution is slowly dripped into the mixed solution of 125ml water and 15ml acetic acid under ice-water bath and strong stirring, after the dropwise addition, continue to stir for 2h, and the stirred reaction solution is Water bath at 318K for 12 hours, then dry at 373K, grind the dried solid to below 100 mesh, calcined at 773K for 2 hours, grind the calcined powder to below 100 mesh for later use, and obtain vanadium-nitrogen co-doped TiO 2 . The resulting vanadium-nitrogen co-doped TiO 2 The degradation rate of phenol was 86.95%.

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Abstract

The invention provides a preparation method of a vanadium-nitrogen co-doped TiO2 photocatalyst. According to the invention, vanadium source is sufficiently dissolved into a mixed phase of tetrabutyl titanate, diethanolamine and ethanol; a vanadium source auxiliary solvent is added to the materials, and the materials are stirred under room temperature, such that the mixed liquid turns into a yellow transparent solution; under severe stirring, the mixed liquid is gradually dropped into a mixed liquid of acetic acid and deionized water in an ice-water bath; the obtained mixture is allowed to react for 1 to 3 hours while stirring, such that the reaction liquid turns into a translucent sol; the translucent sol is positioned in a water bath kettle with a temperature of 308K to 348K, and the solis aged for 12 to 48 hours; the aged sol is positioned in a drying baker, and is dried by baking under a temperature of 353K to 393K; the solid obtained by baking is grinded, and is calcined for 1 to6 hours under a temperature of 573K to 873K; the powder obtained by calcining is grinded again, such that vanadium-nitrogen co-doped TiO2 is obtained. As results of experiments, vanadium-nitrogen co-doped TiO2 synthesized in the invention has good photocatalytic activity and excellent degradability upon phenol; the method is simple and easy to control; and less TiO2 is doped, such that the cost is low, and the method is suitable for industrialized productions.

Description

technical field [0001] The invention relates to a vanadium-nitrogen co-doped TiO 2 The invention discloses a method for preparing a photocatalyst, belonging to the field of photocatalytic materials. Background technique [0002] The use of semiconductor photocatalysts to degrade organic pollutants has the characteristics of mild reaction, high efficiency, simple operation, easy control, and environmental friendliness, and has attracted increasing attention. Among the widely studied semiconductor photocatalytic materials, TiO 2 Due to the advantages of stable chemical properties, good acid and alkali resistance, non-toxicity, abundant sources, low cost, and good catalytic performance, it is considered to be a photocatalyst with the most application potential at present. But due to TiO 2 The bandgap width of 3.0-3.2eV can only absorb ultraviolet light, and ultraviolet light is only 7% in sunlight, so the development of photocatalysts with high catalytic activity under sunli...

Claims

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Application Information

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IPC IPC(8): B01J27/24A62D3/30A62D101/28
Inventor 安兴才韩立娟陈作雁刘刚喜文华
Owner NATURAL ENERGY INST GANSU ACAD OF SCI
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