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Visible light catalyst BiNbO4, preparation method thereof and application thereof

A catalyst and visible light technology, applied in the field of photocatalysis, can solve the problems of insufficient research on photocatalytic properties, and achieve the effects of simple synthesis method, wide application range and high catalytic activity

Inactive Publication Date: 2010-06-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

BiNbO 4 As a new type of catalytic material, its photocatalytic properties have not been fully studied

Method used

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  • Visible light catalyst BiNbO4, preparation method thereof and application thereof
  • Visible light catalyst BiNbO4, preparation method thereof and application thereof
  • Visible light catalyst BiNbO4, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get 7.45g niobium precursor (134.2μmol / g) in 50ml beaker, 0.51g bismuth nitrate pentahydrate (Bi(NO 3 ) 3 ·5H 2 O) dissolved therein, the mixed solution was stirred at 60°C, and ammonia water was added to adjust the pH value to 7-8, and the solution was a colorless transparent liquid. After the solution is prepared, it is baked in an oven at 180° C. for 4 hours to obtain a yellow-brown precursor powder. Then calcined in a muffle furnace at 700 °C for 3 hours to obtain white BiNbO 4 Powder, the specific surface area of ​​the product is about 10.44m 2 / g. figure 1 is BiNbO 4 X-ray diffraction pattern of the powder. Figure 2(a) BiNbO annealed at 700°C for 3 hours 4 SEM topography photos of the powder; Figure 2(b) annealed at 1000°C for 3 hours; Figure 2(c) annealed at 1050°C for 3 hours.

[0021] The white powder (1g / L) was used to degrade a 10mg / L methyl violet solution, and after being ultrasonically dispersed in an ultrasonic bath for 10 minutes at room temperat...

Embodiment 2

[0023] Other conditions are the same as in Example 1. After annealing at 1000° C. for 3 hours, the final product is a white powder. Use the obtained powder (1g / L) to degrade 10mg / L methyl violet solution, ultrasonically disperse at room temperature for 10 minutes, react under visible light for 2.5 hours, the degradation rate reaches 100%, and the specific surface area of ​​the product is about 11.47m 2 / g; Figure 2(b) is BiNbO annealed at 1000°C for 3 hours 4 SEM photo of the powder.

Embodiment 3

[0025] Other conditions are the same as in Example 1. After annealing at 1050° C. for 3 hours, the final product is white powder. Use the obtained powder (1g / L) to degrade 10mg / L methyl violet solution, ultrasonically disperse at room temperature for 10 minutes, react under visible light for 2.5 hours, the degradation rate reaches 100%, and the specific surface area of ​​the product is about 7.86m 2 / g. Figure 2(c) is BiNbO annealed at 1050°C for 3 hours 4 SEM photo of the powder.

[0026] image 3 are BiNbO prepared at different annealing temperatures 4 The visible light degradation curve of methyl violet, the catalyst amount is 1g / L, and the sampling interval is 0.5h.

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Abstract

The invention discloses a visible light catalyst BiNbO4, a preparation method thereof and application thereof. The method for preparing the catalyst comprises the following steps: mixing niobium precursor and soluble bismuth salt to form transparent solution after stirring; stirring the mixture at the temperature of between 60 and 80 DEG C, and adjusting pH value to be between 7 and 8; baking the adjusted solution in an oven at the temperature of between 80 and 250 DEG C for 3 to 10 hours to obtain yellowish-brown precursor powder; and annealing the precursor powder at the temperature of between 550 and 1,050 DEG C for 1 to 24 hours to obtain BiNbO4 powder. The BiNbO4 powder in various crystal forms capable of catalytically decomposing organic dyes under visible light is discovered for the first time; the method for synthesizing the catalyst is simple; and the synthesized BiNbO4 powder has high catalytic activity, can completely degrade methyl violet under the visible light for 1.5 hours, can be used for treating industrial waste water, degrading dye waste water and the like, and has wide application range.

Description

technical field [0001] The present invention relates to a novel BiNbO 4 Visible light catalyst and the synthesis method and application of the catalyst. The catalyst of the invention is suitable for photodecomposition and purification treatment of organic pollutants in air and water, and belongs to the technical field of photocatalysis. Background technique [0002] Semiconductor oxide catalysts have important and broad application prospects in the field of environmental governance, which can degrade and effectively remove toxic chemical pollutants from the environment, especially in the treatment of industrial wastewater. At present, the photocatalysts used in the field of photocatalysis are mostly semiconductor oxides, such as ZnO, TiO 2 , SrTiO 3 , Fe 2 o 3 etc. Semiconductor oxides have attracted widespread attention due to their advantages of simple preparation, stable properties, and low price. However, most of these semiconductor oxides have excellent catalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J37/08A62D3/10C02F1/30A62D101/26C02F101/38
Inventor 翟海法李爱东孔继周吴迪
Owner NANJING UNIV
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