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Preparation method of amorphous iron oxyhydroxide/bismuth vanadate composite photocatalytic material

A bismuth vanadate catalytic material, iron oxide technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, oxygen preparation, etc., can solve the problem of lack of ordered atomic arrangement, narrow amorphous structure, etc. Band gap and other issues, to achieve the effect of multiple active sites, increase oxygen production, and reduce costs

Active Publication Date: 2019-05-21
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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Problems solved by technology

Among them, due to the narrower forbidden band width of the amorphous structure, the lack of ordered atomic arrangement, and more defects

Method used

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  • Preparation method of amorphous iron oxyhydroxide/bismuth vanadate composite photocatalytic material
  • Preparation method of amorphous iron oxyhydroxide/bismuth vanadate composite photocatalytic material
  • Preparation method of amorphous iron oxyhydroxide/bismuth vanadate composite photocatalytic material

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Embodiment

[0033] Weigh 5 mmol Bi(NO3)3·5H2O (analytical grade) and dissolve in 5 mL of 3 mol·L-1 HNO3 solution and 15 mL of ethylene glycol mixed solution to prepare A solution, weigh 5 mmol NH4VO3 (analytical Pure) was dissolved in 20 mL of hot water added with 0.4 g of sodium dodecylbenzenesulfonate (SDBS) to prepare solution B. After each stirring at room temperature for 30 min, solution A was added dropwise to solution B, the pH value was adjusted to 6 using NaOH solution with a concentration of 1 mol L-1, and the mixed solution was stirred for 30 min to obtain the BiVO4 catalyst precursor. Transfer the obtained solution into a 100 mL autoclave lined with polytetrafluoroethylene, seal it, put it in an oven, conduct a hydrothermal reaction at 200°C for 22 hours, cool it down to room temperature naturally, and wash it repeatedly with distilled water and absolute ethanol for more than 3 times , Dry at a constant temperature at 60°C for 6h, and grind it with a mortar after cooling to ob...

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Abstract

The invention belongs to the field of photocatalyst preparation and particularly relates to a preparation method of an amorphous iron oxyhydroxide / bismuth vanadate composite photocatalytic material. The preparation method of the amorphous iron oxyhydroxide / bismuth vanadate composite photocatalytic material comprises the following process steps of synthesizing bismuth vanadate through a hydrothermal method, adopting synthesized bismuth vanadate as a substrate, putting the bismuth vanadate into a mixed solution of ferric chloride and ammonium bicarbonate for stirring, and drying the mixture after centrifuging to obtain a finished product, namely the amorphous iron oxyhydroxide / bismuth vanadate composite photocatalytic material. According to the preparation method, an amorphous material is used as a cocatalyst, and due to the special structure of the amorphous material, the amorphous material lacks ordered atomic arrangement and thus has narrower forbidden bands. These characteristics lead to more defects on the surface of a catalyst, more active sites are provided, the light absorption range is enlarged, and the photocatalytic performance is further improved.

Description

technical field [0001] The invention belongs to the field of photocatalyst preparation, in particular to a method for preparing an amorphous iron oxyhydroxide / bismuth vanitate composite photocatalyst material. Background technique [0002] Photocatalytic water splitting is one of the important methods for solar energy production. Today's co-catalysts for photolysis of water include Pt, Au, Pt / g-C3N4 and other noble metals and noble metal composites. Although the photocatalytic performance is relatively improved, the huge cost also limits its application space. Therefore, people turn their attention to non-precious metal cocatalysts. For example: Fe, Co, Ni, Cu, Zn and carbon-based materials (CoS, Ni(OH)2, NiS, Cu2O, ZnIn2S4 and carbon quantum dots, etc.). However, these co-catalysts are all in the form of crystals to improve the photocatalytic performance, which also reveals that these co-catalysts are strongly dependent on the crystal structure and morphology, especially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/847B01J37/10C01B13/02
Inventor 杨占旭张莹石磊谭文
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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