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Ternary bismuth-based composite photocatalyst Bi/Bi4O5Br2/BiOI, and preparation method and application thereof

A composite light and catalyst technology, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc. The problem of high rate and high efficiency is achieved, and the effect of good visible light sensing ability, simple preparation process and improved catalytic activity can be achieved.

Active Publication Date: 2018-03-13
佛山市德淼环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, from the perspective of the utilization rate of sunlight, wide-bandgap semiconductor photocatalytic materials represented by titanium dioxide still have the following defects: First, the light absorption wavelength of the semiconductor is narrow, mainly in the ultraviolet region, and the efficiency of utilizing sunlight is low; The recombination rate of photogenerated carriers is very high, resulting in low quantum efficiency. These factors restrict the practical industrial application of semiconductor photocatalytic technology to a certain extent.

Method used

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  • Ternary bismuth-based composite photocatalyst Bi/Bi4O5Br2/BiOI, and preparation method and application thereof
  • Ternary bismuth-based composite photocatalyst Bi/Bi4O5Br2/BiOI, and preparation method and application thereof
  • Ternary bismuth-based composite photocatalyst Bi/Bi4O5Br2/BiOI, and preparation method and application thereof

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preparation example Construction

[0019] A kind of ternary bismuth-based composite photocatalyst Bi / Bi provided by the embodiment of the present invention 4 o 5 Br 2 The preparation method of / BiOI comprises:

[0020] Dissolve the bismuth-containing compound in ethylene glycol, then add iodine salt and bromide salt, stir well to dissolve. In the present invention, a bismuth-containing compound and an iodine salt are used as raw materials, and ethylene glycol is used as a reaction solvent. The bismuth-containing compound is not easy to be hydrolyzed in ethylene glycol, which is helpful for the reaction to proceed. In particular, the solvent of the present invention cannot contain water, which will affect the progress of the reaction and the formation of the product. The present invention utilizes Bi 4 o 5 Br 2 It forms a heterojunction with BiOI, and at the same time combines the self-doping of bismuth to increase the electron conduction rate, thereby improving the catalytic activity of the photocatalyst...

Embodiment 1

[0031] This embodiment provides a kind of ternary bismuth-based composite photocatalyst Bi / Bi 4 o 5 Br 2 / BiOI, mainly prepared by the following methods:

[0032] Dissolve 1.56g of bismuth nitrate pentahydrate in 66mL of ethylene glycol, then add 0.249g of potassium iodide and 0.1785g of potassium bromide, and stir well to dissolve. The pH of the solution was adjusted to 10 with sodium hydroxide.

[0033] The mixed solution was transferred to a hydrothermal reaction kettle, and hydrothermally reacted at 150°C for 6h.

[0034] After the product was cooled to room temperature, the product was centrifuged and precipitated, and the precipitate was washed three times with deionized water and ethanol to obtain a yellow solid powder.

[0035] The solid powder was placed in an oven and dried at 60° C. for 12 hours. Fully grind the solid powder to obtain the ternary bismuth-based composite photocatalyst Bi / Bi 4 o 5 Br 2 / BiOI.

Embodiment 2

[0037] This embodiment provides a kind of ternary bismuth-based composite photocatalyst Bi / Bi 4 o 5 Br 2 / BiOI, mainly prepared by the following methods:

[0038] Dissolve 0.73g of bismuth nitrate pentahydrate in 33mL of ethylene glycol, then add 0.166g of potassium iodide and 0.119g of potassium bromide, and stir well to dissolve. The pH of the solution was adjusted to 10 with sodium hydroxide.

[0039] The mixed solution was transferred to a hydrothermal reaction kettle, and hydrothermally reacted at 150°C for 6 h.

[0040] After the product was cooled to room temperature, the product was centrifuged and precipitated, and the precipitate was washed three times with deionized water and ethanol to obtain a yellow solid powder.

[0041] The solid powder was placed in an oven and dried at 60° C. for 12 hours. Fully grind the solid powder to obtain the ternary bismuth-based composite photocatalyst Bi / Bi 4 o 5 Br 2 / BiOI.

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Abstract

The invention provides a ternary bismuth-based composite photocatalyst Bi / Bi4O5Br2 / BiOI, and a preparation method thereof, which relate to the technical field of semiconductor photocatalytic materials. The preparation method of the ternary bismuth-based composite photocatalyst Bi / Bi4O5Br2 / BiOI comprises the steps of dissolving a bismuth-containing compound, iodate and bromine into ethylene glycol,adjusting a pH value of a solution to 8 to 10, and carrying out hydrothermal reaction. The method is simple in preparation process, low in cost, free of producing toxic and harmful byproducts, and easy for industrial production. The ternary bismuth-based composite photocatalyst Bi / Bi4O5Br2 / BiOI is prepared by the preparation method. The catalyst has better visible light induction capability and pollutant degradation capability, and the utilization rate of solar energy is improved during a catalytic process.

Description

technical field [0001] The invention relates to the technical field of semiconductor photocatalytic materials, and in particular to a ternary bismuth-based composite photocatalyst Bi / Bi 4 o 5 Br 2 / BiOI and its preparation method and application. Background technique [0002] At present, the seriousness of environmental pollution has become a direct threat to human existence, an urgent problem that cannot be ignored. The compound refers to the compound formed by replacing the hydrogen atom on the benzene ring in the aromatic hydrocarbon with a hydroxyl group. The water solubility of compounds increases with the increase of the number of hydroxyl groups. Due to the formation of intermolecular hydrogen bonds, most compounds have high boiling points, are difficult to volatilize, and can exist in soil, water and other environments for a long time. During the synthesis, extraction and use of compounds, some compounds are released into the environment, causing environmental po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30B01J37/10C02F101/34
CPCC02F1/30B01J27/06B01J37/10C02F2305/10C02F2101/345B01J35/39
Inventor 涂舜恒王克亮袁素芬江婵陈洲洋
Owner 佛山市德淼环保科技有限公司
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