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Bismuth oxyfluoride photocatalyst and preparing method of bismuth oxyfluoride photocatalyst

A photocatalyst, bismuth oxyfluoride technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc. The effect of good shape, high catalytic activity and simple method

Inactive Publication Date: 2015-07-29
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 It is one of the most common and most studied catalysts, but the photogenerated electron-hole pairs generated by it are easy to recombine, resulting in the inability of electrons and holes to migrate to the surface in time to participate in redox reactions, resulting in low photoconversion efficiency

Method used

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  • Bismuth oxyfluoride photocatalyst and preparing method of bismuth oxyfluoride photocatalyst
  • Bismuth oxyfluoride photocatalyst and preparing method of bismuth oxyfluoride photocatalyst
  • Bismuth oxyfluoride photocatalyst and preparing method of bismuth oxyfluoride photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Bi 7 O 5 F 11 Preparation of Bismuth Oxyfluoride Photocatalyst

[0031] (1) Preparation of glacial acetic acid solution: add 30ml of glacial acetic acid to 30ml of water, that is, mix glacial acetic acid and water at a volume ratio of 1:1, and stir;

[0032] (2) Dissolving in a water bath: take 30ml of glacial acetic acid solution, add 0.4851g (1mmol) of bismuth nitrate pentahydrate and 0.0840g (2mmol) of sodium fluoride, stir in a constant temperature water bath at 80°C for 30 minutes, and dissolve the bismuth nitrate and sodium fluoride to obtain mixture;

[0033] (3) Hydrothermal reaction: Add the above mixed solution into the polytetrafluoroethylene lining, conduct a hydrothermal reaction at a constant temperature of 150°C for 10.5 hours, centrifuge at 3000 rpm for 3 minutes, wash with distilled water and absolute ethanol in turn, and dry at 60°C for 4 hours , that is Bi 7 o 5 f 11 Bismuth oxyfluoride photocatalyst.

[0034] Depend on ...

Embodiment 2

[0035] Example 2: BiO 0.51 F 1.98 Preparation of Bismuth Oxyfluoride Photocatalyst

[0036] (1) Preparation of glacial acetic acid solution: add 30ml of glacial acetic acid to 30ml of water, that is, mix glacial acetic acid and water at a volume ratio of 1:1, and stir;

[0037] (2) Dissolving in a water bath: take 30ml of glacial acetic acid solution, add 0.4851g (1mmol) of bismuth nitrate pentahydrate and 0.0840g (2mmol) of sodium fluoride, stir in a constant temperature water bath at 80°C for 30 minutes, and dissolve the bismuth nitrate and sodium fluoride to obtain mixture;

[0038] (3) Hydrothermal reaction: Add the above mixed solution into the polytetrafluoroethylene lining, conduct a hydrothermal reaction at a constant temperature of 150°C for 11.5 hours, centrifuge at 3000 rpm for 3 minutes, wash with distilled water and absolute ethanol in turn, and dry at 60°C for 4 hours , namely BiO 0.51 f 1.98 Bismuth oxyfluoride photocatalyst.

[0039] Depend on ...

Embodiment 3

[0040] Example 3: BiO 0.67 F 1.66 Preparation of Bismuth Oxyfluoride Photocatalyst

[0041] (1) Preparation of glacial acetic acid solution: add 30ml of glacial acetic acid to 30ml of water, that is, mix glacial acetic acid and water at a volume ratio of 1:1, and stir;

[0042] (2) Dissolving in a water bath: take 30ml of glacial acetic acid solution, add 0.4851g (1mmol) of bismuth nitrate pentahydrate and 0.0840g (2mmol) of sodium fluoride, stir in a constant temperature water bath at 80°C for 30 minutes, and dissolve the bismuth nitrate and sodium fluoride to obtain mixture;

[0043] (3) Hydrothermal reaction: Add the above mixed solution into the polytetrafluoroethylene lining, conduct a hydrothermal reaction at a constant temperature of 150°C for 12.5 hours, centrifuge at 3000 rpm for 3 minutes, wash with distilled water and absolute ethanol in turn, and dry at 60°C for 4 hours , namely BiO 0.67 f 1.66 Bismuth oxyfluoride photocatalyst.

[0044] Depend on ...

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Abstract

The invention discloses a bismuth oxyfluoride photocatalyst and a preparing method of the bismuth oxyfluoride photocatalyst. The preparing method comprises the following steps of adding glacial acetic acid into water, wherein the volume ratio of the glacial acetic acid to the water is 1:2-5:1, stirring the glacial acetic acid and the water, adding bismuth nitrate and soluble fluoride salt into glacial acetic acid solution, stirring in thermostatic waterbath of 75 DEG C to 85 DEG C for 20 to 40 minutes to dissolve the bismuth nitrate and the fluoride salt, making mixed solution with the bismuth nitrate concentrate as 0.95mmol / 30ml to 1.05mmol / 30ml and the mole ratio of bismuth element to fluorine element as 1:1.9 to 1:2.1, adding the mixed solution into a polytetrafluoroethylene lining to be subjected to thermal reaction for 10 to 13 hours in constant-temperature water of 120 DEG C to 160 DEG C, and obtaining the bismuth oxyfluoride photocatalyst after centrifuging, washing and drying. The preparing method is simple, practical, easy to popularize in large scale, suitable for making the bismuth oxyfluoride photocatalyst with high catalytic activity and applied to catalytic degradation of organic pollutants.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a bismuth oxyfluoride photocatalyst and a preparation method thereof. Background technique [0002] With the development of chemical industry, environmental pollution is becoming more and more serious. Utilizing the surface energy activation characteristics of semiconductor oxide materials under sunlight irradiation, organic pollutants can be effectively oxidized and decomposed. Compared with traditional environmental purification treatment methods, semiconductor photocatalysis technology has the advantages of mild reaction conditions, no secondary pollution, simple operation and significant degradation effect. TiO 2 It is one of the most common and most studied catalysts, but the photogenerated electron-hole pairs generated by it are easy to recombine, resulting in the inability of electrons and holes to migrate to the surface in time to participate in redox reactions, resu...

Claims

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Application Information

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IPC IPC(8): B01J27/06C02F1/32C02F101/38
CPCY02W10/37
Inventor 任鸣张棋棋余东方庞露赵正阳张波杜茜田浩滕飞
Owner NANJING UNIV OF INFORMATION SCI & TECH
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