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In-situ preparation method of photocatalyst strontium bismuth niobium oxide containing oxygen vacancy defect

A photocatalyst and vacancy defect technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of increasing the cost of oxygen vacancy defects and difficult process control

Inactive Publication Date: 2017-02-01
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that it increases the cost of generating oxygen vacancy defects and the process is not easy to control. At present, there is no simple and effective method to prepare photocatalysts containing oxygen vacancy defects.

Method used

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  • In-situ preparation method of photocatalyst strontium bismuth niobium oxide containing oxygen vacancy defect
  • In-situ preparation method of photocatalyst strontium bismuth niobium oxide containing oxygen vacancy defect
  • In-situ preparation method of photocatalyst strontium bismuth niobium oxide containing oxygen vacancy defect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a. Weigh SrCO at a molar ratio of 1:1:1 3 , Bi 2 o 3 ,Nb 2 o 5 , and then press SrBi 2 Nb 2 o 9 The total mass ratio of nanosheets, NaCl, and KCl is 1:1. Weigh NaCl and KCl, put the weighed raw materials in an agate mortar and grind for 40 minutes, and then place the ground raw materials in a tube furnace for calcination. , the calcination temperature is 800°C, and the time is 3h. After the reaction, the obtained sample is washed with deionized water, and the method of suction filtration and washing is adopted until the filtrate is neutral, and then the washed sample is placed in a blast drying oven. Dry at 80°C for 2h to obtain SrBi 2 Nb2 o 9 Nanosheets;

[0022] b, weigh the SrBi obtained in step a 2 Nb 2 o 9 20 mg of nanosheets were placed in a glass petri dish with a diameter of 60 mm, and 2 ml of deionized water was added dropwise to ultrasonically disperse evenly, then the petri dish was placed in a drying oven, and dried at 80°C for 60 minutes to remo...

Embodiment 2

[0025] a. Weigh SrCO at a molar ratio of 1:1:1 3 , Bi 2 o 3 ,Nb 2 o 5 , and then press SrBi 2 Nb 2 o 9 The total mass ratio of nanosheets, NaCl, and KCl is 1:10. Weigh NaCl and KCl, put the weighed raw materials in an agate mortar and grind for 40 minutes, and then place the ground raw materials in a tube furnace for calcination. , the calcination temperature is 1000°C, and the time is 3h. After the reaction, the obtained sample is washed with deionized water, and the method of suction filtration and washing is adopted until the filtrate is neutral, and then the washed sample is placed in a blast drying oven. Dry at 80°C for 2h to obtain SrBi 2 Nb 2 o 9 Nanosheets;

[0026] b, weigh the SrBi obtained in step a 2 Nb 2 o 9 Put 50 mg of nanosheets in a glass petri dish with a diameter of 60 mm, add 2 ml of deionized water to disperse evenly by ultrasonic, then put the petri dish in a drying oven, and dry at 200°C for 60 minutes to remove water molecules adsorbed on t...

Embodiment 3

[0029] a. Weigh SrCO at a molar ratio of 1:1:1 3 , Bi 2 o 3 ,Nb 2 o 5 , and then press SrBi 2 Nb 2 o 9 The total mass ratio of nanosheets, NaCl, and KCl is 1:5. Weigh NaCl and KCl, put the weighed raw materials in an agate mortar and grind for 40 minutes, and then place the ground raw materials in a tube furnace for calcination. , the calcination temperature is 1200°C, and the time is 3h. After the reaction, the obtained sample is washed with deionized water, and the method of suction filtration and washing is adopted until the filtrate is neutral, and then the washed sample is placed in a blast drying oven. Dry at 80°C for 2h to obtain SrBi 2 Nb 2 o 9 Nanosheets;

[0030] b, weigh the SrBi obtained in step a 2 Nb 2 o 9 100 mg of nanosheets were placed in a glass petri dish with a diameter of 60 mm, and 2 ml of deionized water was added dropwise to ultrasonically disperse evenly, then the petri dish was placed in a drying oven, and dried at 150°C for 60 minutes to...

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Abstract

The invention relates to an in-situ preparation method of photocatalyst strontium bismuth niobium oxide containing an oxygen vacancy defect. The method comprises the following steps of adopting a molten-salt growth method to synthesize a SrBi2Nb2O9 nanosheet, putting the SrBi2Nb2O9 nanosheet at H2 atmosphere, using ultraviolet-visible-infrared light for full-spectrum illumination, and obtaining SrBi2Nb2O9-VO. Compared with a traditional method that the oxygen vacancy defect is produced by calcining a sample at inert atmosphere or reducing atmosphere, the method for producing the oxygen vacancy defect provided by the invention is simpler, more effectively, lower in required cost, and favorable to take full advantage of sunlight. According to the method, not only can the oxygen vacancy defect be in-site produced on a catalyst, but also the catalyst can utilize the produced oxygen vacancy defect for improving the own performance in photocatalytic reducing CO2. Meanwhile, the method is hopefully applied in other oxygenous Bi-based photocatalysts.

Description

technical field [0001] The invention relates to a photocatalyst SrBi containing oxygen vacancy defects 2 Nb 2 o 9 -V O The in-situ preparation method belongs to the technical field of photocatalytic nano material preparation. Background technique [0002] Energy crisis and environmental pollution are two key issues hindering social and economic development. Photocatalytic technology has attracted widespread attention because it can use sunlight to degrade pollutants and obtain clean energy. In photocatalytic technology, the preparation of high-efficiency photocatalyst is very important, because it determines the efficiency of photocatalysis. However, due to the low spectral utilization of photocatalysts, easy recombination of photogenerated carriers, and small specific surface area, the current photocatalysts still have low activity. In recent years, many methods for modifying and modifying photocatalysts to improve their photocatalytic performance have been developed a...

Claims

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Application Information

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IPC IPC(8): B01J23/20B01J37/34
CPCB01J23/002B01J23/20B01J37/341B01J2523/00B01J35/39B01J2523/24B01J2523/54B01J2523/56
Inventor 李英宣张丙王传义
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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