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Preparation method of precious metal loaded Bi2WO6 visible light photocatalyst

A noble metal and visible light technology, applied in the field of photocatalysis, can solve the problems of limited large-scale application and limited visible light absorption, and achieve the effect of improving visible light catalytic activity, increasing the absorption range, and facilitating recycling and reuse

Inactive Publication Date: 2012-06-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, bismuth-based semiconductor photocatalysts, especially Bi 2 WO 6 Photocatalysts have problems such as photogenerated electrons-holes are easy to recombine, and the absorption of visible light is quite limited, which greatly limits the Bi 2 WO 6 Large-scale applications of photocatalysts

Method used

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  • Preparation method of precious metal loaded Bi2WO6 visible light photocatalyst
  • Preparation method of precious metal loaded Bi2WO6 visible light photocatalyst
  • Preparation method of precious metal loaded Bi2WO6 visible light photocatalyst

Examples

Experimental program
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Effect test

preparation example Construction

[0020] (2) flower-like grade Bi 2 WO 6 Preparation: the above Bi 2 WO 6 Transfer the precursor suspension into a 50mL stainless steel autoclave lined with polytetrafluoroethylene, react at 120-240°C for 10-20h, centrifuge the obtained product, and dry it in vacuum at 50-100°C to obtain a flower-shaped grade Structural Bi 2 WO 6 catalyst of light.

[0021] (3) the flower-like hierarchical structure Bi obtained in step (2) 2 WO 6 Disperse in a mixed solvent of methanol and water, control the volume ratio of methanol to water at 1:3 to 3:1, stir evenly, and then add different amounts of chloroplatinic acid, chloroauric acid, silver nitrate and other acids containing precious metals or Salt, stir evenly, and ultrasonically disperse for 10-120 minutes to obtain a uniformly dispersed suspension.

[0022] (4) Place the suspension obtained in the above step (3) under an ultraviolet lamp, stir while illuminating, illuminate for 10-240min, stop illuminating, let stand for 30min,...

Embodiment example 1

[0024] Embodiment example 1: a kind of noble metal supported Bi of the present invention 2 WO 6 The preparation method of visible light catalyst comprises the following steps:

[0025] (1) Preparation of Bi 2 WO 6 Precursor solution: Dissolve 2mmol of bismuth nitrate in 5ml of acetic acid to form a transparent solution, add 20mL of 0.05mol / L sodium tungstate solution under stirring, and stir for 0.5h to obtain Bi 2 WO 6 Precursor white suspension.

[0026] (2) flower-like grade Bi 2 WO 6 Preparation: the above Bi 2 WO 6 The precursor suspension was transferred into a 50mL stainless steel autoclave lined with polytetrafluoroethylene, reacted at 180°C for 15h, cooled naturally to room temperature, and the resulting product was centrifuged and dried in vacuum at 50°C to obtain a flower-like hierarchical structure Bi 2 WO 6 catalyst of light.

[0027] (3) Take the flower-like hierarchical structure Bi obtained in step (2) 2 WO 6 150mg was dispersed in a mixed solvent...

Embodiment 2

[0030] Implementation example 2: a kind of noble metal supported Bi of the present invention 2 WO 6 The preparation method of visible light catalyst comprises the following steps:

[0031] (1) Preparation of Bi 2 WO 6 Precursor solution: Dissolve 1mmol of bismuth nitrate in 5ml of acetic acid to form a transparent solution, add 10mL of 0.05mol / L sodium tungstate solution under stirring, and stir for 0.5h to obtain Bi 2 WO 6 Precursor white suspension.

[0032] (2) flower-like grade Bi 2 WO 6 Preparation: the above Bi 2 WO 6 The precursor suspension was transferred to a 50mL stainless steel autoclave lined with polytetrafluoroethylene, reacted at 170°C for 20h, cooled naturally to room temperature, and the resulting product was centrifuged and dried in vacuum at 50°C to obtain a flower-like hierarchical structure Bi 2 WO 6 catalyst of light.

[0033] (3) Take the flower-like hierarchical structure Bi obtained in step (2) 2 WO 6 150mg was dispersed in a mixed solve...

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Abstract

The invention discloses a preparation method of precious metal loaded Bi2WO6 visible light photocatalyst, which is mainly characterized in that the photo-induced electrons and positive holes of the Bi2WO6 photocatalyst are easy to be re-combined to reduce the photocatalytic activity thereof, and a precious metal is loaded on the surface of the Bi2WO6 photocatalyst to greatly improve the separation of the photo-induced electrons and the positive holes so as to improve the photocatalytic performance of the Bi2WO6 visible light photocatalyst. The preparation method comprises the following steps of: (1) synthesizing Bi2WO6 by a liquid phase method: firstly dissolving bismuth salt in certain amount of acetic acid, blending the solution with tungsten salt according to a metering ratio, uniformly stirring, filling the mixture in a reaction kettle to react at 120-240 DEG C for 10-20 h, centrifugally separating the obtained products and drying the same at 50-100 DEG C in vacuum; (2) the Bi2WO6 synthesized by the liquid phase method is of a flower-shaped grade structure assembled by nanometer pieces, dispersing the obtained Bi2WO6 with flower-shaped structure in a mixed solvent of methanol and water, adding different dosages of such acids or salts containing precious metals as chloroplatinic acid or chloroauric acid, uniformly stirring, and ultrasonic dispersing for 10-120 min; (3) putting the mixed solution under an ultraviolet lamp, and irradiating for 10-240 min to obtain the precious metal loaded Bi2WO6 visible light photocatalyst. The method has the advantages of simple technique and low cost, and the prepared precious metal loaded Bi2WO6 visible light photocatalyst has high visible light catalytic activity.

Description

technical field [0001] The invention belongs to the photocatalytic technology, and relates to the reduction of precious metals by means of ultraviolet light, which is deposited on the flower-like hierarchical structure Bi 2 WO 6 surface, a noble metal-supported Bi 2 WO 6 visible light catalyst. Background technique [0002] At present, the seriousness of environmental pollution has become a focal issue that directly threatens the survival of human beings and urgently needs to be resolved. Photocatalytic technology is a green technology that has been gradually developed since the 1970s and has important application prospects in the fields of energy and the environment. This technology can oxidize and decompose organic pollutants in the environment, and finally degrade them into CO 2 , water and inorganic ions and other small molecules, so no secondary pollution, high degree of degradation is considered to be the most promising pollution treatment method. [0003] Bismut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/652B01J23/68B01J37/34A62D3/17A62D101/20
Inventor 段芳张乾宏柯磊施冬健东为富倪忠斌陈明清
Owner JIANGNAN UNIV
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