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Visible light catalytic material, and preparation method and application thereof

A catalytic material and visible light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, polycrystalline material growth, etc., can solve the problems of limited catalytic performance, easy agglomeration, unfavorable dyes, etc., and achieve cheap and easy-to-get raw materials. The effect of large surface area and good stability

Active Publication Date: 2011-06-01
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, such d 10 Type transition metal oxides are usually prepared by solid-state sintering, which is easy to agglomerate and is not conducive to the adsorption of harmful substances such as dyes, which seriously limits the improvement of its catalytic performance.

Method used

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  • Visible light catalytic material, and preparation method and application thereof
  • Visible light catalytic material, and preparation method and application thereof
  • Visible light catalytic material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Take 0.9701g Bi(NO 3 ) 3 ·5H 2 O and 0.7012g SnCl 4 ·5H 2 O was added to a 1mol / L aqueous solution of 40mL NaOH, and the amorphous precursor solution was obtained after thorough stirring. The precursor solution was transferred into a hydrothermal reaction kettle, reacted at 240° C. for 24 hours, cooled to room temperature naturally, filtered and dried to collect the obtained pale yellow powder. UV-vis test shows that its absorption edge is around 446nm, the corresponding optical band gap is 2.78eV, and it has visible light response, such as figure 1 shown. According to the XRD test, the pure phase pyrochlore Bi 2 sn 2 o 7 ,Such as figure 2 and image 3 shown. Using VASP-GGA to calculate the energy band, the results show that the conduction band composition is Bi6p+Sn 5s+O2p, and the valence band composition is O2p+Bi 6s, which is an indirect transition material, such as Figure 4 and Figure 5 shown.

[0048] The Bi obtained in this example 2 sn 2 o 7 ...

Embodiment 2

[0051] Take 0.9701g Bi(NO 3 ) 3 ·5H 2 O and 0.7012g SnCl 4 ·5H 2 O was added to 40 mL of KOH in 10 M aqueous solution, and the amorphous precursor solution was obtained after thorough stirring. The precursor solution was transferred into a hydrothermal reaction kettle, reacted at 240° C. for 6 h, cooled to room temperature naturally, filtered and dried to collect the obtained pale yellow powder. UV-vis test shows that its absorption edge is around 452nm, the corresponding optical bandgap is 2.75eV, and it has visible light response. After XRD test, the pure phase pyrochlore Bi was also obtained 2 sn 2 o 7 ,Such as image 3 shown.

[0052] The Bi obtained in this example 2 sn 2 o 7 The particle size of nanoparticles is 5-10nm, and the specific surface area is 62.6m 2 / g.

[0053] Will get Bi 2 sn 2 o 7 Nanoparticles were used in the UV photodegradation experiment of methyl orange, and the results showed that its photocatalytic activity was significantly better ...

Embodiment 3

[0055] Take 0.9701g Bi(NO 3 ) 3 ·5H 2 O and 0.7012g SnCl 4 ·5H 2 O was added to 40 mL of ammonia solution, the pH value of the solution was adjusted to about 11, and the amorphous precursor solution was obtained after fully stirring. The precursor solution was transferred into a hydrothermal reaction kettle, reacted at 240° C. for 96 h, cooled down to room temperature naturally, filtered and dried to collect the obtained pale yellow powder. UV-vis test shows that its absorption edge is around 460nm, the corresponding optical bandgap is 2.70eV, and it has visible light response. After XRD test, the pure phase pyrochlore Bi was also obtained 2 sn 2 o 7 .

[0056]The Bi obtained in this example 2 sn 2 o 7 The particle size of nanoparticles is 5-10nm, and the specific surface area is 50.8m 2 / g.

[0057] Will get Bi 2 sn 2 o 7 Nanoparticles were used in the experiment of visible light degradation of acetaldehyde, after 5h of visible light irradiation, the produced ...

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Abstract

The invention discloses a visible light catalytic material used for environmental purification and a preparation method thereof. The visible light catalytic material is an indirect gas semiconductor with a dispersed energy band structure, is a crystalline nano material, comprises the chemical formula of Bi2Sn2O7, has the corresponding optical band gap width of 2.68 to 2.78eV and exhibits high visible light catalytic performance. In the preparation method provided by the invention, Bi2Sn2O7 nanoparticles can be prepared from readily-available raw materials with low cost under moderate conditions only by one-step hydrothermal reaction so as to avoid the coarsening and aggregation of the high-temperature sintered crystal particles; the preparation method is simple to operate; parameters are adjustable in a reaction process, and the crystallinity and material phase compositions of the product are easy to control; in addition, the sample provided by the invention exhibits high stability inphotocatalysis cycle tests of dye degradation and harmful gas purification, and is favorable for industrial application.

Description

technical field [0001] The invention relates to a visible light catalytic material and its preparation method and application, in particular to a visible light catalytic material for purifying the environment, its preparation method and application, and belongs to the technical field of functional materials. Background technique [0002] Since 1972 Fujishima and Honda discovered in TiO 2 Since the phenomenon of photoresponsive hydrogen production on the surface of electrode materials (Fujishima, A. Honda, K., Nature 238, 37-38), photocatalysis has attracted worldwide attention as a potential technology to solve environmental pollution and energy crisis. In the process of semiconductor photocatalysis, light irradiation excites electrons in the valence band to transition to the conduction band, forming photogenerated electrons on the conduction band and photogenerated holes on the valence band; after the carriers migrate to the surface of the powder particles, they are fully i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B7/10B01J23/18B01J23/14B01J37/00
Inventor 黄富强吴建军
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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