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Method for preparing niobate photocatalyst

A photocatalyst, niobate technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor photocatalyst adsorption, low photodegradation efficiency, etc. problem, to achieve the effect of narrow particle size distribution, high photodegradation efficiency and good crystallinity

Inactive Publication Date: 2009-05-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a niobate photocatalyst in order to solve the problems of poor adsorption and low photodegradation efficiency of the photocatalyst prepared by the existing method

Method used

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  • Method for preparing niobate photocatalyst
  • Method for preparing niobate photocatalyst

Examples

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specific Embodiment approach 1

[0009] Specific embodiment one: the preparation method of the niobate photocatalyst of this embodiment is realized according to the following steps: 1. Weigh 0.20~0.30g of niobium pentoxide and 3.0~3.5g of potassium hydroxide and dissolve them in 5~8mL of Ionized water, then placed on a magnetic stirrer and stirred for 30-60 minutes to obtain the mixture; 2. Add the mixture to a high-pressure reactor with a polytetrafluoroethylene liner, seal it and then under the condition of a temperature of 220-240°C, Heat treatment for 12 to 24 hours, and naturally cool to room temperature to obtain the niobate photocatalyst precursor; 3. Filter and wash the niobate photocatalyst precursor for 3 to 5 times, and then dry it at a temperature of 80 to 100°C After 5-10 hours, the niobate photocatalyst is obtained; the amount of the mixture added in the second step is 60%-80% of the volume of the polytetrafluoroethylene-lined autoclave.

[0010] This embodiment is the first time that pyrochlore...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that in step 1, 0.22-0.28 g of niobium pentoxide and 3.1-3.4 g of potassium hydroxide are weighed and dissolved in 5.5-7.5 mL of deionized water. Other steps and parameters are the same as those in Embodiment 1.

[0012] The niobium pentoxide and potassium hydroxide used in this embodiment can be purchased in the market, which greatly reduces the production cost.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment differs from Embodiment 1 in that in step 1, 0.24-0.26 g of niobium pentoxide and 3.25-3.35 g of potassium hydroxide are weighed and dissolved in 6-7 mL of deionized water. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a method for preparing a niobate photocatalyst, and relates to a method for preparing a photocatalyst. The method solves the problems that a photocatalyst prepared by the prior method has poor adsorptivity and low photodegradation efficiency. The preparation method comprises the following steps: 1. niobium pentaoxide and potassium hydroxide are weighed, and a mixture is prepared through magnetic stirring; 2. the mixture is placed into a high-pressure reaction kettle to be prepared into a precursor of the niobate photocatalyst; and 3. the precursor of the niobate photocatalyst is filtered, washed and dried. The invention is to adopt a method of synthesis by a hydro-thermal method to realize the synthesis of the niobate photocatalyst first. The obtained product has high purity, good absorption performance, and high photodegradation efficiency; and the method has cheap raw materials, simple process and simple equipment.

Description

technical field [0001] The invention relates to a preparation method of a photocatalyst. Background technique [0002] The natural environment is the basic guarantee for the survival and development of human beings and the civilization and progress of society. However, with the rapid development of industrialization and the continuous expansion of urbanization in recent years, the environmental pollution has become more and more serious, and the discharge of harmful substances has also increased year by year. At present, photocatalysts are rich in content, clean and harmless (using the electronic structure and photochemical properties of semiconductors to degrade, oxidize or reduce pollutants, and finally convert them into harmless or reusable substances), cheap and driven by sunlight. Power, and gradually replaced biochemical agents as green environmental protection agents. The existing photocatalyst with the best effect and function is TiO 2 (especially P25-TiO 2 ) pho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20B01J23/04
Inventor 陈刚周超张红杰李英宣
Owner HARBIN INST OF TECH
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