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Visible-light response calcium-bismuth composite oxide catalyst and preparation method thereof

A technology of composite oxides and catalysts, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc. Complicated process and other issues, to achieve high commercial application prospects, good visible light degradation activity, and simple preparation method

Inactive Publication Date: 2013-04-17
ZHEJIANG NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The photocatalyst that has been studied more now is TiO 2 TiO 2 Modified catalysts, but most of these catalysts have disadvantages such as low quantum efficiency, low utilization rate of visible light, and complicated preparation process, which limits the practical wide application of this technology.

Method used

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  • Visible-light response calcium-bismuth composite oxide catalyst and preparation method thereof
  • Visible-light response calcium-bismuth composite oxide catalyst and preparation method thereof
  • Visible-light response calcium-bismuth composite oxide catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Weigh 9.799g of bismuth nitrate, add 4mL of concentrated nitric acid and 20mL of deionized water, stir and dissolve to obtain a bismuth nitrate solution. Weigh 2.385g of calcium nitrate, add 10mL of deionized water, stir and dissolve to obtain a calcium nitrate solution. Weigh 1.468g of EDTA, add 2mL of 35% ammonia water to dissolve to obtain EDTA solution. The calcium nitrate solution was then added dropwise to the bismuth nitrate solution with stirring, followed by the EDTA solution. Add 35% ammonia water dropwise to adjust the pH to 8 to form a white precipitate. Stir and age for 5 hours and filter with suction. The obtained solid is dried in an oven at 120°C for 12 hours, taken out and ground, and finally roasted in a muffle furnace at 500°C for 12 hours. Calcined CaBi at 500°C after natural cooling 7 o 11.5 catalyst.

Embodiment 2

[0018] Weigh 9.799g of bismuth nitrate, add 4mL of concentrated nitric acid and 20mL of deionized water, stir and dissolve to obtain a bismuth nitrate solution. Weigh 2.385g of calcium nitrate, add 10mL of deionized water, stir and dissolve to obtain a calcium nitrate solution. Weigh 1.468g of EDTA, add 2mL of 35% ammonia water to dissolve to obtain EDTA solution. The calcium nitrate solution was then added dropwise to the bismuth nitrate solution with stirring, followed by the EDTA solution. Add 35% ammonia water dropwise to adjust the pH to 8 to form a white precipitate. Stir and age for 5 hours and filter with suction. The obtained solid is dried in an oven at 120°C for 12 hours, taken out and ground, and finally roasted in a muffle furnace at 550°C for 12 hours. Calcined CaBi at 550°C after natural cooling 7 o 11.5 catalyst.

Embodiment 3

[0020] Weigh 9.799g of bismuth nitrate, add 4mL of concentrated nitric acid and 20mL of deionized water, stir and dissolve to obtain a bismuth nitrate solution. Weigh 2.385g of calcium nitrate, add 10mL of deionized water, stir and dissolve to obtain a calcium nitrate solution. Weigh 1.468g of EDTA, add 2mL of 35% ammonia water to dissolve to obtain EDTA solution. The calcium nitrate solution was then added dropwise to the bismuth nitrate solution with stirring, followed by the EDTA solution. Add 35% ammonia water dropwise to adjust the pH to 8 to form a white precipitate. Stir and age for 5 hours and then suction filter. The obtained solid is dried in an oven at 120°C for 12 hours, taken out and ground, and finally roasted in a muffle furnace at 600°C for 12 hours. Calcined CaBi at 600°C after natural cooling 7 o 11.5 catalyst.

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Abstract

The invention relates to a visible-light response calcium-bismuth composite oxide catalyst and a preparation method thereof. The visible-light response calcium-bismuth composite oxide catalyst is calcium-bismuth composite oxide, and the chemical composition formula is CaBixOdelta, wherein x is more than or equal to 6.5 and less than or equal to 9, and delta is more than or equal to 10.75 and lessthan or equal to 14.5. The preparation method of the catalyst comprises the following steps of: weighing bismuth nitrate and calcium nitrate, preparing into solution, mixing, then adding edetic acid solution under the condition of stirring, using 35% aqueous solution of ammonia to adjust the pH value of the solution to be 8, stirring and ageing for 5 hours, filtering precipitates, cleaning and drying; and roasting for 12 hours at the temperature of 500-700 DEG C under the air atmosphere, cooling and obtaining the catalyst. The invention has the advantages that the preparation method of the catalyst is simple, the cost is low, and the visible-light response for organic pollutants is higher.

Description

technical field [0001] The invention relates to a chemical catalyst and a preparation method thereof, in particular to a visible light-responsive calcium-bismuth composite oxide catalyst and a preparation method thereof. Background technique [0002] Environment and energy are major issues facing and urgently needed to be resolved by mankind in the 21st century. With the development of modern industry and agriculture, environmental pollution is becoming more and more serious. Some refractory organic pollutants such as aromatic hydrocarbons, halogenated substances, pesticides, dyes, etc. are often present in air, water, soil, and fruit and vegetable foods at very low concentrations. Disorders and other diseases. Therefore, it is imperative to purify the environment economically and effectively. The current sewage treatment methods mainly include: physical methods, removing suspended solids through filtration, sedimentation, flotation and other methods; chemical methods, de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18B01J37/08A62D3/10A62D101/28
Inventor 赵雷洪何益明王永姣李婷婷
Owner ZHEJIANG NORMAL UNIVERSITY
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