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Photocatalyst and preparation method thereof

A technology of photocatalysts and nanowires, applied in the field of photocatalytic materials, to achieve wide application prospects, good photocatalysis and nonlinear optical properties, and good repeatability

Inactive Publication Date: 2014-04-30
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Ding et al prepared KNbO 3 nanowires, KNb was prepared by Zhan et al. 3 o 8 nanoribbons, and their photocatalytic properties have been studied, however, no Ag nanoparticles-coated KNb 3 o 8 Preparation of nanowire crystals

Method used

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  • Photocatalyst and preparation method thereof
  • Photocatalyst and preparation method thereof
  • Photocatalyst and preparation method thereof

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preparation example Construction

[0014] The preparation method of a kind of photocatalyst of the embodiment of the present invention comprises:

[0015] Step 1: Provide KNb 3 o 8 Nanowires;

[0016] Step 2: Add AgNO to ammonia solution 3 solution, stirred, adding the KNb 3 o 8 Nanowires, continue to stir, then add aldehyde-containing solution for silver mirror reaction, rinse after cooling, and obtain KNb coated with Ag nanoparticles 3 o 8 Nanowires.

[0017] Specifically, in step one, KNb 3 o 8 The preparation method of nanowires: at room temperature, weigh KCl and Nb according to a certain molar ratio 2 o 5 , ground in a mortar for 30 minutes, transferred to a crucible, calcined in a muffle furnace for 1 to 4 hours, cooled to room temperature, washed with water, filtered, and the filtrate was washed with distilled water until the pH value was equal to 7, then washed with ethanol Rinse and dry at 60-100°C for 5-12 hours to obtain KNb 3 o 8 Nanowires.

[0018] Specifically, in step two, KNb 3 o...

Embodiment 1

[0023] At room temperature (10-40°C), weigh 3.3048g of potassium chloride and 2.0086g of niobium pentoxide, and thoroughly grind and mix them in an agate mortar for 0.5 hours. Then move it into a ceramic crucible, put it into a muffle furnace and calcinate at a high temperature for 3 hours. The material was washed with distilled water until the pH value was equal to 7, and dried at 100 °C for 6 hours to obtain KNb 3 o 8 Nano stave. 1.5g AgNO 3 Add 50mL water and mix well, add 2.0wt% ammonia solution dropwise to the above AgNO 3 In the solution, stir with a magnetic stirrer until the solution is colorless, then add 0.2g KNb 3 o 8 Nanowires, continue magnetic stirring, then add 8.0mol / L formaldehyde solution at 60°C, react for 40min, cool to room temperature, wash with distilled water, then filter with a filter membrane with a filter hole diameter of 0.6μm, and filter the filtrate with distilled water After washing until the pH value is equal to 7, dry at 80 °C for 10 hour...

Embodiment 2

[0027] At room temperature (10-40°C), weigh 3.3048g of potassium chloride and 2.0086g of niobium pentoxide, and thoroughly grind and mix them in an agate mortar for 0.5 hours. Then move it into a ceramic crucible, put it into a muffle furnace and calcinate at a high temperature for 3 hours. The material was washed with distilled water until the pH value was equal to 7, and dried at 100 °C for 6 hours to obtain KNb 3 o 8 Nano stave. 2.0g AgNO 3 Add 50mL water and mix evenly, add 2.0% ammonia solution dropwise to the above AgNO 3 In the solution, stir with a magnetic stirrer until the solution is colorless, then add 0.2g KNb 3 o 8 Nanowires, continue magnetic stirring, then add 7.0mol / L formaldehyde solution at 60°C, react for 40min, cool to room temperature, wash with distilled water, then filter with a filter membrane with a filter hole diameter of 0.6μm, and filter the filtrate with distilled water After washing until the pH value is equal to 7, dry at 80°C for 10 hours...

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Abstract

The invention relates to the field of nano photocatalysis materials, and discloses a photocatalyst. The photocatalyst comprises a nano wire KNb3O8 and silver nano particles covering the surface of the nano wire KNb3O8. The photocatalyst is prepared by covering the surface of the nano wire KNb3O8 with the silver nano particles by an oxidation-reduction method. The preparation method is easy to operate, high in repetitiveness and low in cost. The photocatalyst disclosed by the invention is high in photocatalysis and high in nonlinear optical coefficient and can be widely applied to dye sewage treatment, energy storage, light waveguide, frequency doubling and holographic storage equipment.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a photocatalyst applicable to sewage treatment and a preparation method thereof. Background technique [0002] The dye wastewater produced by the textile industry is one of the main sources of water pollution. At present, various physical, chemical and biological methods to treat dye wastewater can only transfer pollutants from one phase to another. Instead of destroying it, the photocatalytic method is a more effective water treatment method, which can destroy the structure of the dye and completely treat the dye in the sewage, which has attracted widespread attention. [0003] Titanium dioxide is the most commonly used semiconductor photocatalyst for sewage treatment. Due to the limited catalytic activity and selectivity of titanium dioxide, its wide application is limited. A more effective photocatalyst has been found: layered niobic acid salt as K 4 Nb 6 o 17 , Bi ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/66B01J35/02B01J35/00
Inventor 曹慧群于斌于杰曹博游诚辛红罗仲宽
Owner SHENZHEN UNIV
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