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A kind of nano-silver niobate visible light photocatalyst and its low-temperature preparation method

A technology of photocatalyst and silver niobate, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as high temperature, and achieve the effect of simple process and excellent visible light photocatalytic activity

Active Publication Date: 2018-04-17
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, usually the solid state reaction and hydrothermal preparation of niobate photocatalysts require very high temperatures

Method used

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  • A kind of nano-silver niobate visible light photocatalyst and its low-temperature preparation method
  • A kind of nano-silver niobate visible light photocatalyst and its low-temperature preparation method
  • A kind of nano-silver niobate visible light photocatalyst and its low-temperature preparation method

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Experimental program
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Effect test

Embodiment 1

[0017] 1) First, the analytically pure AgNO 3 Dissolved in deionized water, configured as a silver nitrate solution with a concentration of 8g / l;

[0018] 2) Secondly, the K 8-x h x Nb 6 o 19 Add deionized water to obtain a saturated transparent solution;

[0019] 3) Then, the transparent solution is slowly added dropwise to the silver nitrate solution under magnetic stirring to generate a light yellow precipitate, and the dropwise addition is stopped until no precipitation occurs;

[0020] 4) Finally, the precipitate was separated by centrifugation, washed with deionized water, and dried at 30° C. to obtain a visible-light photocatalyst of nano-silver niobate.

Embodiment 2

[0022] 1) First, the analytically pure AgNO 3 Dissolved in deionized water, configured as a silver nitrate solution with a concentration of 12g / l;

[0023] 2) Secondly, the K 8-x h x Nb 6 o 19 Add deionized water to obtain a saturated transparent solution;

[0024] 3) Then, the transparent solution is slowly added dropwise to the silver nitrate solution under magnetic stirring to generate a light yellow precipitate, and the dropwise addition is stopped until no precipitation occurs;

[0025] 4) Finally, the precipitate was separated by centrifugation, washed with deionized water, and dried at 40° C. to obtain a nano-silver niobate visible light photocatalyst.

Embodiment 3

[0027] 1) First, the analytically pure AgNO 3 Dissolved in deionized water, configured as a silver nitrate solution with a concentration of 1g / l;

[0028] 2) Secondly, the K 8-x h x Nb 6 o 19 Add deionized water to obtain a saturated transparent solution;

[0029] 3) Then, the transparent solution is slowly added dropwise to the silver nitrate solution under magnetic stirring to generate a light yellow precipitate, and the dropwise addition is stopped until no precipitation occurs;

[0030] 4) Finally, the precipitate was separated by centrifugation, washed with deionized water, and dried at 25° C. to obtain a nano-silver niobate visible light photocatalyst.

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Abstract

A nano-silver niobate visible light photocatalyst and its low-temperature preparation method. The whole preparation process adopts a one-step low-temperature chemical synthesis method: under the condition of magnetic stirring, the solution of potassium niobate (K8‑xHxNb6O19) is slowly added dropwise to silver nitrate (AgNO3) A light yellow precipitate is formed in the solution, and then AgNbO4‑δ can be obtained by washing and drying at low temperature, where 0≤δ≤1, and the crystal structure belongs to scheelite-type oxide. The advantages of the present invention are: (1) compared with other methods (solid-phase reaction method, hydrothermal method, etc.), the method has simple technology, does not need complex equipment, and the preparation process is all completed at low temperature (room temperature); ( 2) The method is convenient and fast, and is suitable for mass photocatalyst production; (3) The nanocatalyst prepared by the method has excellent visible light photocatalytic activity.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method thereof, in particular to a nanometer silver niobate visible light photocatalyst and a preparation method thereof. Background technique [0002] With the rapid development of global industrialization, the problems of environmental pollution and energy shortage are becoming more and more serious. Therefore, pollution control and renewable energy development have become the two most important issues in the world, and naturally they have also become important research contents for scientific researchers. Semiconductor photocatalysis can achieve the purpose of degrading pollutants, splitting water to produce hydrogen, and reducing carbon dioxide, which is just related to pollution control and energy issues. At present, the common materials used as photocatalysts are binary oxides (TiO 2 , ZnO, SnO 2 , WO 3 , ZrO 2 , Nb 2 o 5 , Fe 2 o 3 , CdO, etc.), multiple oxides (SrTiO 3 , BaTiO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/68
CPCB01J23/682B01J37/031B01J35/39B01J35/40
Inventor 阙文修刘晓斌
Owner XI AN JIAOTONG UNIV
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