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Preparation method of bismuth phosphate photocatalyst

A technology of photocatalyst and bismuth phosphate, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of unsatisfactory catalytic activity of photocatalysts, and achieve low cost and good catalytic performance , the effect of simple preparation method

Inactive Publication Date: 2013-09-04
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the catalytic activity of photocatalysts in the prior art is still not satisfactory.

Method used

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  • Preparation method of bismuth phosphate photocatalyst
  • Preparation method of bismuth phosphate photocatalyst
  • Preparation method of bismuth phosphate photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 1 mmol each of EDTA-2Na and bismuth nitrate in water, stir evenly, add nitric acid with a concentration of 65% by mass to adjust the pH to 2, add 1 mmol sodium phosphate, and stir for five minutes to obtain a mixed solution.

[0021] The mixed solution was put into an autoclave, and hydrothermal reaction was carried out at 160° C. for 24 hours. After the hydrothermal reaction, the precipitate was collected by centrifugation, and dried at 60°C for 3 hours to obtain catalyst 1.

[0022] From figure 1 It can be seen that the crystal morphology of Catalyst 1 is uniform and snowflake-like. From figure 2 It can be seen that catalyst 1 is a pure phase of bismuth phosphate.

Embodiment 2

[0024] Dissolve 1mmol of EDTA-2Na and 0.5mmol of bismuth nitrate in water, stir evenly, add nitric acid with a concentration of 66% by mass to adjust the pH to 3, add 0.5mmol of sodium phosphate, and stir for five minutes to obtain a mixed solution.

[0025] The mixed solution was put into an autoclave, and hydrothermal reaction was carried out at 180° C. for 18 hours. After the hydrothermal reaction, the precipitate was collected by centrifugation, and dried at 80°C for 2 hours to obtain catalyst 2.

[0026] It can be seen from the X-ray diffraction picture of catalyst 2 that catalyst 2 is bismuth phosphate in a pure phase. From the scanning electron microscope image of Catalyst 2, it can be seen that the crystal morphology of Catalyst 2 is uniform and snowflake-like.

Embodiment 3

[0028] Dissolve 1mmol of EDTA-2Na and 0.25mmol of bismuth nitrate in water, stir evenly, add nitric acid with a concentration of 68% by mass to adjust the pH to 2.5, add 0.25mmol of sodium phosphate, and stir for five minutes to obtain a mixed solution.

[0029] The mixed solution was put into an autoclave, and hydrothermal reaction was carried out at 170° C. for 20 hours. After the hydrothermal reaction, the precipitate was collected by centrifugation, and dried at 70°C for 2.5 hours to obtain catalyst 3.

[0030] It can be seen from the X-ray diffraction picture of catalyst 3 that catalyst 3 is bismuth phosphate in a pure phase. From the scanning electron microscope image of Catalyst 3, it can be seen that the crystal morphology of Catalyst 3 is uniform and snowflake-like.

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Abstract

The invention provides a preparation method of a bismuth phosphate photocatalyst, and relates to the field of photocatalysts. The preparation method comprises the following steps: (1) dissolving EDTA-2Na and bismuth nitrate in water, adjusting the pH value to be 2 to 3, stirring the EDTA-2Na and the bismuth nitrate to be uniform, and adding sodium phosphate into the EDTA-2Na and the bismuth nitrate, so as to obtain mixed solution; (2), putting the mixed solution obtained in the step (1) into a high pressure reactor, and reacting for 18 to 24 hours at the temperature of 160 to 180 DEG C; and (3), performing centrifugation to take precipitate after the reaction in the second step is accomplished, and then obtaining the bismuth phosphate photocatalyst after drying. The method changes a traditional method that the bismuth phosphate nanorod is prepared from glycerol and water mixed solvent into the EDTA-2Na complexing bismuth ions, controls crystal morphology growth through the process of releasing the bismuth ions through complexing, obtains bismuth phosphate photocatalyst with novel crystal morphology which is snowflake-shaped. The preparation method is simple, the cost is low, without needing medicine with high price, the operation process is simple, and the method is easy to implement.

Description

technical field [0001] The invention relates to the field of photocatalysts, in particular to a method for preparing bismuth phosphate photocatalysts. Background technique [0002] Human society is experiencing tremendous technological and economic changes, and the development of various technological technologies and production is changing with each passing day. While developing and producing, mankind is facing an inescapable reality—pollution. Pollution exists in all aspects of our lives, water pollution, air pollution and so on. In order to protect our common home, the earth, people have adopted different methods to control and eliminate pollutants. Photocatalyst is one of the promising approaches. [0003] In 1972, Japanese scientist Fujishima et al. discovered that TiO2 single-crystal electrodes can realize photocatalytic water splitting (Fujishima A., 1972), and later discovered that nano-TiO2 has the ability to photocatalytically degrade organic matter. TiO2 has be...

Claims

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Application Information

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IPC IPC(8): B01J27/186
Inventor 陈敏东张求应张桐瑜徐娟李守光滕飞
Owner NANJING UNIV OF INFORMATION SCI & TECH
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