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Visible-light response nano Bi3NbO7 photocatalyst preparation method and use thereof

A photocatalyst, visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Advanced problems, to achieve good catalytic degradation effect, easy to operate

Inactive Publication Date: 2009-02-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the preparation of niobium (tantalum) salt photocatalysts is mainly obtained by the traditional solid-state method by sintering at a higher temperature for a long time, but because the raw materials are difficult to mix evenly, the reaction temperature is high, and the reaction is not easy. Completely, so the prepared powder particles are large, and the distribution is uneven, often mixed with heterogeneous phases, these two aspects make the photocatalytic activity of the photocatalyst synthesized by the solid phase method decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Visible light-responsive nano-Bi 3 NbO 7 The preparation method of photocatalyst, it comprises the steps:

[0019] 1) Weigh 2.0000g of Nb 2 o 5 Add it to 70ml of KOH solution with a concentration of 3mol / L, seal and heat it in a polytetrafluoroethylene reactor at 200°C to form a colorless and transparent solution, and add HCl solution to adjust the pH to 5 under stirring conditions, so that The niobium in the solution is completely converted to niobate (Nb 2 o 5 ·nH 2 (2) form precipitates out, obtains white precipitate, washes precipitate repeatedly with distilled water 3~5 times, to remove the potassium ion adsorbed on the precipitate, obtains niobic acid precipitate;

[0020] 2) Add 20 grams of oxalic acid to the obtained niobic acid precipitate (at this time, the mass ratio of niobic acid precipitate to oxalic acid is about 1:10), and heat at 80°C with constant stirring to obtain water-soluble oxalic acid Niobium aqueous solution (i.e. niobium oxalate aqueous...

Embodiment 2

[0025] Visible light-responsive nano-Bi 3 NbO 7 The preparation method of photocatalyst, it comprises the steps:

[0026] 1) Weigh 2.0000g of Nb 2 o 5 Add it to 70ml of KOH solution with a concentration of 3mol / L, seal and heat it in a polytetrafluoroethylene reactor at 200°C to form a colorless and transparent solution, and add HCl solution dropwise to adjust the pH to 6 under stirring conditions. The niobium in the solution is completely replaced by niobic acid (Nb 2 o 5 ·nH 2 (2) form precipitates out, obtains white precipitate, washes precipitate with distilled water 3~5 times, to remove the potassium ion adsorbed on the precipitate, obtains niobic acid precipitate;

[0027]2) Add 20 grams of oxalic acid to the obtained niobic acid precipitate (at this time, the mass ratio of niobic acid precipitate and oxalic acid is 1:10), and stir continuously at 80°C to obtain a water-soluble niobium oxalate aqueous solution (i.e. oxalate aqueous solution);

[0028] 3) Add 0.18...

Embodiment 3

[0032] Visible light-responsive nano-Bi 3 NbO 7 The preparation method of photocatalyst, it comprises the steps:

[0033] 1) Press Nb 2 o 5 The ratio with KOH solution is 1g: 60ml, choose Nb 2 o 5 And KOH solution, standby; Wherein the concentration of KOH solution is 2mol / L;

[0034] Will Nb 2 o 5 Put it into the KOH solution, seal and heat it in a reaction kettle at 160°C to form a colorless and transparent solution, add hydrochloric acid dropwise under stirring conditions, and adjust the pH of the solution to 4, so that the niobium in the solution is completely dissolved in niobic acid (Nb 2 o 5 ·nH 2 O) form precipitates out, get throw out; Rinse with deionized water to remove the residual potassium ion that adsorbs on the throw out, obtain niobic acid throw out;

[0035] 2) Add the obtained niobic acid precipitate into oxalic acid, and heat it at 60°C with constant stirring to obtain a water-soluble niobium oxalate aqueous solution (i.e. niobium oxalate aqueous...

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Abstract

The invention relates to a preparation method of Bi3NbO7, and the application of the Bi3NbO7. The preparation method comprises the following steps: Nb2O5 is taken as raw material to prepare a hydrosoluble niobium oxalate aqueous solution by a hydrothermal method; bismuth nitrate (Bi(NO3)3 question mark 5H2O) is added into a citric acid solution and then added with a mixed solution of EDTA and stronger ammonia water so as to form an aqueous solution of bismuth; then, the niobium oxalate aqueous solution is added into the aqueous solution of bismuth according to the composition of a mixture ratio, and the obtained solution is heated and stirred under 60 DEG C to 80 DEG C so as to obtain a precursor solution of Bi3NbO7 photocatalyst which is then treated with polyesterification and is burned to decarburize and then roasted under 450 DEG C to 750 DEG C to obtain the nanometer Bi3NbO7 photocatalyst. The activity of the nanometer Bi3NbO7 photocatalyst prepared by the invention is far higher than that prepared by the traditional solid phase method and the preparation method is characterized by low synthesis temperature and simple and convenient operation.

Description

technical field [0001] The present invention relates to Bi 3 NbO 7 The preparation method and Bi 3 NbO 7 Applications. Background technique [0002] In recent years, the research on photocatalyst treatment of printing and dyeing wastewater has become a domestic research hotspot. However, most studies have focused on TiO 2 However, due to its high band gap, it generally only absorbs ultraviolet light, which limits its wide application. Therefore, it is necessary to develop a new type of photocatalytic activity under visible light. Photocatalyst has become a hot issue in the field of photocatalysis. In recent ten years, a series of niobium (tantalum) salt photocatalysts have been widely studied due to their high photocatalytic activity. For example, a series of niobate photocatalysts Pb 3 Nb 4 o 13 、BiNbO 4 and Bi 2 MbO 7 (M=Al, Ga, In, Y, rare earth metals, Fe), etc. and niobium potassium composite oxide photocatalysts such as KNbO 3 , KNb 3 o 8 、K 4 Nb 6 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J23/18
Inventor 张高科杨军玲李名熊茜吕凡
Owner WUHAN UNIV OF TECH
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