Bismuth tungstate composite photocatalyst, preparation method thereof, and application thereof

A catalyst and composite light technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problems of photocatalytic efficiency and low utilization of sunlight, etc. Achieve the effect of improving photocatalytic efficiency, good photocatalytic activity, and high photocatalytic activity

Inactive Publication Date: 2012-02-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Bi 2 WO 6 The oxidation ability and photocatalytic efficiency of the mature TiO 2 There is still ...

Method used

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  • Bismuth tungstate composite photocatalyst, preparation method thereof, and application thereof
  • Bismuth tungstate composite photocatalyst, preparation method thereof, and application thereof
  • Bismuth tungstate composite photocatalyst, preparation method thereof, and application thereof

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Experimental program
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Embodiment 1

[0045] According to 98wt.% Bi 2 WO 6 -2wt.%TiO 2 Proportion preparation of Bi 2 WO 6 Composite photocatalyst, concrete steps are as follows: according to stoichiometric ratio, weigh 0.970gBi(NO 3 ) 3 ·5H 2 O and 0.330gNa 2 WO 4 2H 2 O was dissolved in 20 mL of ethylene glycol respectively, and the above two solutions were mixed uniformly to obtain a clear solution, which was then transferred to a hydrothermal kettle and heated at 160 °C for 16 hours. After the reaction, the obtained product was centrifuged, washed and then dried at 60° C. for 4 hours. Will get 0.98gBi 2 WO 6 The powder is uniformly dispersed in TiO prepared from butyl titanate 2 in the precursor fluid. Preparation of TiO 2 The main steps of the precursor fluid are: add 1 volume of butyl titanate to 10 volumes of ethanol to make a butyl titanate ethanol solution, then add 1 volume of stabilizer, stir vigorously to obtain a light yellow transparent solution, and then slowly add 2 volume of pure wa...

Embodiment 2

[0048] According to 80wt.% Bi 2 WO 6 -20wt.%TiO 2 Proportioning prepares composite photocatalyst, concrete steps are as follows: the TiCl of 4.1kg / hr 4 evaporation. With the help of nitrogen, steam and 2.0Nm 3 / hr of hydrogen, and 9.1Nm 3 / hr of dry air is mixed in a mixing chamber of a burner of known design, supplied via a central tube to a water-cooled flame tube at the end of which the reaction mixture is ignited, where they burn. Then in the filter the formed TiO 2 separate. Treatment with humid air at 500-700°C to remove adhering chlorides to yield TiO 2 powder. The prepared 0.5gTiO 2 Uniformly dispersed in 2.78gBi(NO 3 ) 3 ·5H 2 In 20mL nitric acid solution of O, add 0.95g Na 2 WO 4 2H 2 After 20 mL of aqueous solution of O, mix well and transfer to a hydrothermal kettle, and heat at 160 °C for 18 h. After the reaction, the obtained product was centrifuged, washed and dried at 60°C for 4 hours to obtain the 80wt.% Bi 2 WO 6 -20wt.%TiO 2 composite phot...

Embodiment 3

[0052] According to 52wt.% Bi 2 WO 6 -48wt.%TiO 2 Proportioning prepares composite photocatalyst, concrete steps are as follows: adopt the method identical with embodiment 2 to prepare TiO 2 powder, and then the prepared 0.48gTiO 2 Disperse evenly in the proportion containing 0.72gBi(NO 3 ) 3 ·5H 2 O and 0.25gNa 2 WO 4 2H 2 O in ethylene glycol 40mL solution. Mix well and transfer to a hydrothermal kettle and heat at 160°C for 18 hours. After the reaction, the obtained product was centrifuged, washed and then dried at 60° C. for 4 hours.

[0053] Bi prepared for research 2 WO 6 The performance of the composite photocatalyst in the application of sewage treatment, design the experiment of the photocatalyst in the application of air purification, use the photocatalytic degradation experiment of acetaldehyde (100ppm) gas, measure the output of carbon dioxide gas by gas chromatography, and then draw the acetaldehyde (100ppm) gas production. The degradation rate of ald...

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Abstract

The invention belongs to the field of photocatalyst, and specifically relates to a Bi2WO6 (bismuth tungstate) composite photocatalyst, a preparation method thereof, and an application thereof. The Bi2WO6 composite photocatalyst comprises components of, by weight: 1-99% of Bi2WO6 and 1-99% of TiO2. The Bi2WO6 composite photocatalyst can be prepared through a coprecipitation method, a thermal decomposition method, a hydro thermal method, a solvent thermal method, or a sol-gel method. The Bi2WO6 composite photocatalyst provided by the invention has advantages of high catalytic activity, good cyclical stability, and wide photoresponse range. The Bi2WO6 composite photocatalyst can be widely applied in respects of sewage processing, air conditioning, and sterilizing. The Bi2WO6 composite photocatalyst has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of photocatalysts, in particular to a Bi 2 WO 6 Composite photocatalyst and its preparation and application. Background technique [0002] Since the development of photocatalytic technology, it has shown the characteristics of mild reaction conditions, complete degradation, clean and environmental protection in environmental purification, and has gradually become one of the popular technologies in the field of pollution control. At present, the most widely used in the field of photocatalysis is TiO excited by ultraviolet light. 2 Based on photocatalysts, in order to more effectively utilize renewable energy sunlight for environmental pollution control, the development of high-performance photocatalytic materials that respond to visible light has become a current research hotspot and development trend. [0003] In recent years, Bi 2 WO 6 Due to its high visible light activity, it has become a research hotspot in t...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/30B01D53/86B01J23/31
Inventor 王文中徐婕慧
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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