Hollow mesoporous defect type tungsten trioxide nanospheres as well as preparation method and application thereof

A tungsten trioxide and defect-type technology, which is applied in the field of nanomaterials, achieves the effects of low raw material cost, increased separation efficiency, and significantly improved photothermal catalytic performance

Active Publication Date: 2020-04-17
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
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  • Claims
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Problems solved by technology

Therefore, CO 2 Photoreduction activity and selectivi

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  • Hollow mesoporous defect type tungsten trioxide nanospheres as well as preparation method and application thereof
  • Hollow mesoporous defect type tungsten trioxide nanospheres as well as preparation method and application thereof
  • Hollow mesoporous defect type tungsten trioxide nanospheres as well as preparation method and application thereof

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[0040] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The operating methods not indicated in the following examples are generally in accordance with conventional conditions, or in accordance with the conditions suggested by the manufacturer.

[0041] In this example, unhydrogenated WO 3 Nanomaterials are prepared by hydrothermal polymerization, including fully mixing and stirring the precursor before hydrothermal treatment, and then hydroheating at a certain temperature for a period of time to rearrange the crystal lattice of the precursor powder, and then ultrasonically dispersing it, fully mixing it, and centrifuging , so that the particles are finely crushed, and then freeze-dried to obtain WO 3 precursor, and then annealed in an air atm...

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Abstract

The invention discloses hollow mesoporous defect type tungsten trioxide nanospheres, and a preparation method thereof and an application of the hollow mesoporous defect type tungsten trioxide nanospheres in photothermal catalytic reduction of CO2 to produce methane. The preparation method comprises the steps: dissolving a tungsten precursor in glacial acetic acid to obtain a precursor solution; carrying out hydrothermal reaction on the precursor solution at the temperature of 160-180 DEG C for 16-18 h; and after the reaction is finished, naturally cooling, carrying out ultrasonic treatment onthe obtained reaction solution for 12-16 h, centrifuging, washing, drying, roasting at the temperature of 500-550 DEG C, naturally cooling to obtain tungsten trioxide powder, and reducing the tungstentrioxide powder by utilizing H2/Ar at the temperature of 400-450 DEG C to obtain the hollow mesoporous defect type tungsten trioxide nanospheres. The hollow mesoporous defect type tungsten trioxide nanospheres are formed by self-assembling and stacking WO3 nanorods, the molecular formula of the hollow mesoporous defect type tungsten trioxide nanospheres is WO3-x, wherein x is larger than 2.5 andsmaller than 3, and the particle size of the hollow mesoporous defect type tungsten trioxide nanospheres is 200-500 nm. A full-spectrum light source is adopted for irradiation, and the hollow mesoporous defect type tungsten trioxide nanospheres show excellent performance of photothermal catalytic reduction of CO2 to produce methane.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a hollow mesoporous defect type tungsten trioxide nanosphere and its preparation method and application. Background technique [0002] A photocatalyst is usually a hybrid semiconductor that absorbs ultraviolet and visible light, separates photogenerated charges, provides active sites for catalytic reactions, and transfers them to the surface. Various semiconductor oxides have been widely used as photocatalysts, but the current photocatalytic materials generally can only use ultraviolet light and visible light, and can hardly use the light energy in the infrared region of 40% to 50% of the solar spectrum, so its photocatalytic The efficiency is generally low, so that the reaction efficiency is limited. If the infrared part of natural light can be used to cause local interface heating, increasing the effective collision in the reaction will help reduce the activation energy ...

Claims

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Application Information

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IPC IPC(8): C01G41/02
CPCC01G41/02C01P2004/62C01P2004/34C01P2004/03C01P2004/04C01P2002/72C01P2002/85
Inventor 郭乔琪徐颖峰冯华军沈东升
Owner ZHEJIANG GONGSHANG UNIVERSITY
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