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Method for synthesizing novel visible light driven BI2WO6 photocatalyst by employing microemulsion-hydrothermal technology

A photocatalyst, visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effects of no high temperature heat treatment, cost reduction, and simple and easy operation.

Inactive Publication Date: 2010-07-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the deficiencies in the existing new photocatalyst preparation technology, the purpose is to provide a new type of visible light active Bi with low preparation temperature, simple application process, large specific surface area and high visible light activity. 2 WO 6 Synthetic method of photocatalyst

Method used

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  • Method for synthesizing novel visible light driven BI2WO6 photocatalyst by employing microemulsion-hydrothermal technology
  • Method for synthesizing novel visible light driven BI2WO6 photocatalyst by employing microemulsion-hydrothermal technology
  • Method for synthesizing novel visible light driven BI2WO6 photocatalyst by employing microemulsion-hydrothermal technology

Examples

Experimental program
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Embodiment 1

[0017] Weigh Tween 80: n-butanol: n-heptane in a certain ratio, and stir evenly on a constant temperature magnetic stirrer until the three are evenly mixed. Prepare two parts of such microemulsion systems in this way for future use. Weigh a certain amount of Na according to the stoichiometric ratio 2 WO 4 2H 2 O and Bi(NO 3 ) 3 ·5H 2 O, were dissolved in deionized water to make a transparent solution. The above two transparent solutions were respectively added into the above microemulsion system under the condition of constant stirring. Stirring was continued for 30 min to form a stable microemulsion system. Under vigorous stirring, the above two microemulsion systems were mixed together, and ammonia water (NH 3 ·H 2 O) Adjust the pH to about 7, and then continue to stir for 40 minutes to 60 minutes. Then put the above-prepared microemulsion system into a closed reaction kettle made of stainless steel and lined with white polytetrafluoroethylene for heat treatment at...

Embodiment 2

[0019] Weigh Tween 80: n-butanol: n-heptane in a certain ratio, and stir evenly on a constant temperature magnetic stirrer until the three are evenly mixed. Prepare two parts of such microemulsion systems in this way for subsequent use. Weigh a certain amount of Na according to the stoichiometric ratio 2 WO 4 2H 2 O and Bi(NO 3 ) 3 ·5H 2 O, were dissolved in deionized water to make a transparent solution. The above two transparent solutions were respectively added into the above microemulsion system under the condition of constant stirring. Stirring was continued for 30 min to form a stable microemulsion system. Under vigorous stirring, the above two microemulsion systems were mixed together, and ammonia water (NH 3 ·H 2 O) Adjust the pH to about 7, and then continue to stir for 40 minutes to 60 minutes. Then put the above-prepared microemulsion system into a closed reaction kettle made of stainless steel and lined with white polytetrafluoroethylene for heat treatmen...

Embodiment 3

[0021] Weigh Tween 80: n-butanol: n-heptane in a certain ratio, and stir evenly on a constant temperature magnetic stirrer until the three are evenly mixed. Prepare two parts of such microemulsion systems in this way for subsequent use. Weigh a certain amount of Na according to the stoichiometric ratio 2 WO 4 2H 2 O and Bi(NO 3 ) 3 ·5H 2 O, were dissolved in deionized water to make a transparent solution. The above two transparent solutions were respectively added into the above microemulsion system under the condition of constant stirring. Stirring was continued for 30 min to form a stable microemulsion system. Under vigorous stirring, the above two microemulsion systems were mixed together, and ammonia water (NH 3 ·H 2 O) Adjust the pH to about 7, and then continue to stir for 40 minutes to 60 minutes. Then put the above-prepared microemulsion system into a closed reaction kettle made of stainless steel and lined with white polytetrafluoroethylene for heat treatmen...

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Abstract

The invention discloses a method for synthesizing a novel visible light driven BI2WO6 photocatalyst by employing microemulsion-hydrothermal technology. The photocatalyst is characterized by having low preparation temperature, simple application technology, large specific surface area and high visible light activity and containing orthorhombic phase BI2WO6 compounds. The method comprises the following steps: proportionally weighing Tween 80, normal butanol, n-butanol and n-heptane to prepare two microemulsion systems; preparing transparent solutions at a certain concentration with Na2WO4.2H2O and Bi(NO3)3.5H2O respectively; adding the transparent solutions into the prepared microemulsion systems respectively; uniformly mixing the transparent solutions and the microemulsion systems after full stirring, then adjusting the pH to a certain value by using dilute ammonia water, placing the obtained microemulsion systems into a closed reaction kettle which is made of stainless steel and has white polytetrafluoroethylene lining for heat treatment at 150-220 DEG C for 3-9h, finishing treatment and cooling the substances to room temperature; and separating the product by a centrifuge, washing the obtained yellow precipitates with deionized water and ethanol multiple times and drying the precipitates for multiple hours, thus obtaining the novel visible light driven BI2WO6 photocatalyst.

Description

technical field [0001] The present invention relates to a kind of preparation method of novel photocatalyst, relate to a kind of adopting microemulsion-hydrothermal technology to synthesize orthorhombic Bi 2 WO 6 The new visible light active photocatalyst method belongs to the scientific and technological field intersecting material science and catalysis science. Background technique [0002] Currently widely used photocatalysts such as TiO 2 etc., are wide-bandgap semiconductor photocatalysts that respond only in the ultraviolet range. In the sunlight that reaches the earth's surface, ultraviolet light is less than 5%, while visible light accounts for nearly 43%. Therefore, the development of highly active photocatalysts that respond to visible light is the key to improving solar energy utilization. By adjusting the energy band structure of semiconductor photocatalysts, people have designed many new photocatalysts, Bi 2 WO 6 As one of the promising new photocatalytic m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31C01G41/00
Inventor 戈磊张宪华
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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