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Method for preparing oxygen vacancy-containing bismuth tungstate ultrathin sheet, and oxygen vacancy-containing bismuth tungstate ultrathin sheet and application thereof

A technology of bismuth tungstate and ultra-thin slices, which can be used in separation methods, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve problems such as light waste

Inactive Publication Date: 2020-10-23
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the wide bandgap of these photocatalysts, most of them can only absorb and utilize ultraviolet light, which accounts for only about 5% of solar energy.
This causes most of the light in solar energy to be wasted, such as visible light, which accounts for nearly half
In addition, the rapid recombination of photoexcited electron-hole pairs also largely inhibits the conversion efficiency of formaldehyde photocatalytic oxidation.

Method used

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  • Method for preparing oxygen vacancy-containing bismuth tungstate ultrathin sheet, and oxygen vacancy-containing bismuth tungstate ultrathin sheet and application thereof
  • Method for preparing oxygen vacancy-containing bismuth tungstate ultrathin sheet, and oxygen vacancy-containing bismuth tungstate ultrathin sheet and application thereof
  • Method for preparing oxygen vacancy-containing bismuth tungstate ultrathin sheet, and oxygen vacancy-containing bismuth tungstate ultrathin sheet and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039]0.165g sodium tungstate dihydrate (Sinopharm Chemical Reagent Co., Ltd., purity ≥ 99%), 0.485g bismuth nitrate pentahydrate (Sinopharm Chemical Reagent Co., Ltd., purity ≥ 99%) and 10mg potassium bromide (Sinopharm Chemical Reagent Co., Ltd., purity ≥ 99%) were dissolved in 40mL deionized water and 500 μL concentrated nitric acid (Sinopharm Chemical Reagent Co., Ltd., concentration 67% by mass) mixed solution in turn, placed on an electric heating mantle stirrer (Shanghai Meiyingpu Instrument Co., Ltd. After stirring for 30 minutes at 200r / min from Instrument Manufacturing Co., Ltd. (08-2T), transfer the resulting mixture into a 50mL autoclave, seal it, and put it into an oven (Shanghai Jinghong Experimental Equipment Co., Ltd. XMTD-8222) to react at 120°C for 24h . After the reaction was completed, it was naturally cooled to room temperature, and centrifuged at a speed of 10,000 rpm in a high-speed centrifuge (Anhui Zhongke Zhongjia Scientific Instrument Co., Ltd. HC-35...

Embodiment 2

[0042] 200 mg of Bi without oxygen vacancies synthesized 2 WO 6 The ultra-thin slices are evenly spread on the bottom of the quartz boat, placed on the downstream end (left) of the gas flow of the double-chamber tube furnace (Kojing OTF-1200X-Ⅱ), and placed at the upstream position (right) about 10 cm away from it Another quartz boat contains 15-20 g of aluminum powder (Sinopharm Chemical Reagent Co., Ltd., purity ≥ 99%). Set the heating program so that the left part of the double-chamber tube furnace is kept at 300 °C, and the right part is kept at 700 °C for 2 hours. Create a simulated vacuum environment by connecting the continuous work of the vacuum pump, and start the heating program of the tube furnace at the same time. After natural cooling, the samples were washed several times with water and ethanol, and dried in vacuum for later use.

[0043] The flake product was respectively used XRD instrument (Philips X'Pert Pro Super diffractometer), transmission electron mic...

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Abstract

The invention provides a method for preparing an oxygen vacancy-containing bismuth tungstate ultrathin sheet. The method comprises the following steps: step 1) synthesizing an oxygen vacancy-free bismuth tungstate (Bi2WO6) ultrathin sheet by using a hydrothermal method; and step 2) synthesizing the oxygen vacancy-containing bismuth tungstate ultrathin sheet from the oxygen vacancy-free bismuth tungstate ultrathin sheet obtained in the step 1) by using a vacuum aluminothermic method. The invention also provides the oxygen vacancy-containing bismuth tungstate ultrathin sheet prepared by using the method, and a method for photocatalytic degradation of formaldehyde into carbon dioxide by using the oxygen vacancy-containing bismuth tungstate ultrathin sheet.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a method for preparing bismuth tungstate ultrathin flakes containing oxygen vacancies, the ultrathin bismuth tungstate flakes containing oxygen vacancies prepared by the method, and tungstic acid using the oxygen vacancies Photocatalytic degradation of formaldehyde to carbon dioxide by bismuth ultrathin flakes. Background technique [0002] Formaldehyde is an important precursor for the synthesis of many compounds and other materials. Millions of tons of formaldehyde are used in the field of construction and interior decoration materials every year, such as plywood, adhesives, fiberboard, permanent press fabrics, insulation materials and some decorative coatings. As one of the most common harmful indoor air pollutants among volatile organic compounds (VOCs), formaldehyde is carcinogenic, toxic and volatile, and its main sources are decorative materials and a large number of household pro...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01J35/02B01D53/86B01D53/72
CPCB01J23/31B01D53/8668B01D2255/802B01J35/00B01J35/30B01J35/39
Inventor 孙永福邵威威谢毅
Owner UNIV OF SCI & TECH OF CHINA
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