Carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material and preparation method thereof

A technology of ultra-thin bismuth tungstate and photocatalytic materials, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc., can solve problems of low electrical conductivity, low photocatalytic reduction efficiency, and low exposure surface Active sites and other issues, to achieve the effect of low recombination efficiency, excellent visible light response and charge transfer ability, and improved solar energy utilization

Active Publication Date: 2017-07-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Despite these advantages of bismuth tungstate, the presence of CO 2 The problem of low photocatalytic reduction efficiency, which is mainly due to its low conductivity and very few exposed surface active sites

Method used

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  • Carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material and preparation method thereof
  • Carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material and preparation method thereof
  • Carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The synthesis process of carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material is as follows:

[0040] 1) Na 2 WO 4 , a certain amount of cetyltrimethylammonium bromide (CTAB) was dissolved in distilled water to form a uniform solution, wherein the concentration of CTAB was 0.625mg / mL; 2) Bi(NO 3 ) 3 Pour the powder into the solution obtained in step 1), and stir rapidly for more than 1 hour until the solution turns milky white, wherein the molar ratio of CTAB:W:Bi is 1:7:14, and pour the obtained solution into a 50ml polytetrafluoroethylene reaction kettle reacted at 120°C for 24 hours, and the resulting precipitate was washed 3 times with water and ethanol, filtered and dried to obtain an ultra-thin bismuth tungstate nanosheet photocatalytic material; 3) the ultra-thin tungstic acid containing residual CTAB obtained in step 2) Bismuth nanosheets were placed in a tube furnace in N 2 The carbon-doped ultrathin bismuth tungstate nanosheet photoca...

Embodiment 2

[0050] In order to examine the effect of CTAB on the morphology and structure of carbon-doped bismuth tungstate nanosheet photocatalyst materials, except for CTAB, other reaction conditions are as follows: sample addition sequence, stirring time, W:Bi ratio, reaction temperature (120°C), reaction Time (24h), heat treatment time (1h), temperature (350 ℃) etc. are all identical with embodiment 1. The results showed that when no CTAB was added, since no CTAB was inserted into Bi 2 WO 6 Between molecular layers, Bi 2 WO 6 In the hydrothermal synthesis process, thick sheets self-assemble into a spherical structure. Compared with the carbon-doped ultra-thin bismuth tungstate nanosheets in Example 1, the ultra-thin two-dimensional nanosheet structure cannot be formed, nor can it be calcined for doping modification. . When the concentration of CTAB is adjusted in the range of 0.5-0.7 mg / mL, bismuth tungstate nanosheets with ultrathin structure can be obtained. Therefore, during t...

Embodiment 3

[0052] In order to test the influence of carbon doping on the photocatalytic material of ultra-thin bismuth tungstate nanosheets, in addition to not heat-treating the sample, and using deionized water, ethanol, and isopropanol to wash the sample several times to ensure that CTAB is cleaned, Other reaction conditions are as follows: sample addition order, stirring time CTAB:W:Bi ratio, reaction temperature (120°C), reaction time (24h), etc. are the same as in Example 1. Reference Example 1 carries out XRD, SEM, BET, CO 2 Adsorption and other tests. See the results separately Figure 1-9 .

[0053] Show comprehensively by above-mentioned result: by the carbon-doped ultrathin bismuth tungstate nanosheet photocatalyst material that obtains in embodiment 1, compare with the bulk bismuth tungstate of embodiment 2, specific surface area improves greatly, electron-hole pair Reduced recombination efficiency, enhanced visible light absorption performance, CO 2 The adsorption capacit...

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Abstract

The invention relates to a carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material and a preparation method thereof. The modified carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material is characterized by being doped with carbon and prepared by piling ultrathin flaky bismuth tungstate nanosheets bent and agglomerated to some degree. The novel visible-light responsive carbon-doped ultrathin bismuth tungstate nanosheet photocatalytic material is of a flaky structure, has more active sites and large specific surface area, excellent CO2 capturing capability and visible-light response and charge transfer capability and low photoproduced electron-hole pair compounding efficiency, the solar energy utilization rate is greatly improved, the material is used for photocatalytic reduction of CO2, and the photocatalytic reduction activity of the CO2 can be obviously improved.

Description

technical field [0001] The invention relates to the technical fields of two-dimensional material preparation and energy environment, in particular to a carbon-doped ultra-thin bismuth tungstate nanosheet photocatalytic material and a preparation method thereof. Background technique [0002] At present, fossil fuels account for more than 80% of global energy sources, and its continuous use will lead to a continuous rise in the level of carbon dioxide in the earth's atmosphere. In order to achieve sustainable economic and social development, we urgently need to find new clean energy, and artificial photosynthesis function, it can directly convert water and CO under the action of light under the action of light at room temperature and normal pressure 2 Switching to renewable hydrocarbon clean fuels is considered one of the most promising and compelling solutions to energy and environmental problems. Many photocatalysts, such as TiO 2 , ZnO, CdS and other semiconductors have b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30C10G2/00
CPCB01J23/30B01J35/004C10G2/00C10G2300/70
Inventor 曹少文张军超余家国
Owner WUHAN UNIV OF TECH
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