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Dried persimmon-shaped visible-light-driven photocatalyst BiOBr and preparation method thereof

A visible light and catalyst technology, applied in the fields of photocatalysis and material chemistry, can solve the problem of the influence of particle morphology samples on photocatalytic performance, and achieve the effects of good visible light catalytic activity, low photocorrosion, and easy availability of raw materials.

Inactive Publication Date: 2014-04-30
YULIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, factors such as the phase structure, grain size, and particle morphology of BiOX have a great influence on the photocatalytic performance of the sample.

Method used

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  • Dried persimmon-shaped visible-light-driven photocatalyst BiOBr and preparation method thereof
  • Dried persimmon-shaped visible-light-driven photocatalyst BiOBr and preparation method thereof
  • Dried persimmon-shaped visible-light-driven photocatalyst BiOBr and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 3 millimoles of bismuth nitrate pentahydrate and dissolve it in 8 mL of ethylene glycol, and stir evenly;

[0027] Weigh 6.5 mmol of cetyltrimethylammonium bromide and dissolve it in 15mL of ethylene glycol, and stir evenly;

[0028] Slowly add the solution obtained in step to the solution obtained in step , and stir for 30 minutes;

[0029] Weigh 0.5g of polyvinylpyrrolidone into the solution obtained in step , and stir for 30 minutes;

[0030] Transfer the mixture to a 50mL stainless steel hydrothermal kettle lined with polytetrafluoroethylene, add ethylene glycol to control the volume of the solution to 30mL, then let it stand and heat at 120°C for 10 hours;

[0031] After step finishes the reaction and cools down naturally, remove the upper liquid, vacuum filter and separate the solid product, wash the gained solid product with deionized water and absolute ethanol to neutrality respectively, then dry at 60°C for 20 hours, a white BiOBr solid powder w...

Embodiment 2

[0033] Weigh 5 mmoles of bismuth nitrate pentahydrate and dissolve it in 10 mL of ethylene glycol, and stir evenly;

[0034] Weigh 7 mmoles of cetyltrimethylammonium bromide and dissolve it in 15mL of ethylene glycol, and stir evenly;

[0035] Slowly add the solution obtained in step to the solution obtained in step , and stir for 30 minutes;

[0036] Weigh 0.7g of polyvinylpyrrolidone into the solution obtained in step , and stir for 30 minutes;

[0037] Transfer the mixture to a 50mL stainless steel hydrothermal kettle lined with polytetrafluoroethylene, add ethylene glycol to control the volume of the solution to 40mL, then let it stand and heat at 120°C for 12 hours;

[0038] After step finishes the reaction and cools down naturally, remove the upper layer liquid, vacuum filter and separate the solid product, wash the gained solid product with deionized water and absolute ethanol to neutrality respectively, then dry at 60°C for 24 hours, a white BiOBr solid powde...

Embodiment 3

[0040] Weigh 5 mmoles of bismuth nitrate pentahydrate and dissolve it in 10 mL of ethylene glycol, and stir evenly;

[0041] Weigh 7.5 millimoles of cetyltrimethylammonium bromide and dissolve it in 15mL of ethylene glycol, and stir evenly;

[0042] Slowly add the solution obtained in step to the solution obtained in step , and stir for 50 minutes;

[0043] Weigh 0.7g of polyvinylpyrrolidone into the solution obtained in step , and stir for 50 minutes;

[0044] Transfer the mixture to a 50mL stainless steel hydrothermal kettle lined with polytetrafluoroethylene, add ethylene glycol to control the volume of the solution to 40mL, then let it stand and heat at 120°C for 12 hours;

[0045] After step finishes the reaction and cools down naturally, remove the upper layer liquid, vacuum filter and separate the solid product, wash the gained solid product with deionized water and absolute ethanol to neutrality respectively, then dry at 80°C for 10 hours, a white BiOBr solid...

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Abstract

The invention discloses a dried persimmon-shaped visible-light-driven photocatalyst BiOBr and a preparation method thereof. The inventor adopts a low-temperature solvothermal method, controls the morphology of a halogen-bismuth-oxide visible-light-driven photocatalyst by controlling the dosage of a bismuth source and a bromine source and adding a structure guiding agent, and successfully prepares the novel efficient visible-light-driven photocatalyst BiOBr with novel and special morphology, the dried persimmon shape, for the first time. The preparation method disclosed by the invention is simple in overall production technology, easy to operate, low in synthesis temperature, high in reaction yield (89%), friendly to environment and low in cost, and accords with the requirements of practical production, and the raw materials are readily available. The visible-light-driven photocatalyst disclosed by the invention has good visible-light catalytic activity, can completely degrade a plurality of organic pollutants (such as methylthionine chloride and methyl orange) within a short period of time under irradiation of visible light, is small in light corrosivity, good in reusability and large in market potential, can be applied to industrial production, and especially has good application value in photocatalytic decomposition of organic pollutants by solar energy.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis and material chemistry, and in particular relates to a persimmon-shaped visible light catalyst BiOBr and a preparation method thereof. Background technique [0002] Over the years, people have modified or sensitized TiO2 in various ways to enhance its response to visible light to improve its photocatalytic activity. However, due to the properties of TiO2 itself, the application of modified photocatalytic materials is still greatly limited, especially the shortage of ultraviolet light sources. Therefore, finding new photocatalysts that can directly absorb visible light is of most interest to researchers. Bismuth oxyhalide BiOX (X=Cl, Br, I) is a new type of semiconductor material, which has a unique open structure and indirect transition mode, which is conducive to the effective separation and charge transfer of hole-electron pairs, thus having a relatively Good light performance and catal...

Claims

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Application Information

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IPC IPC(8): B01J27/08B01J35/02C02F1/30C02F101/30
CPCY02W10/37
Inventor 陈渊朱万仁杨家添谢祖芳韦庆敏朱立刚庞起
Owner YULIN NORMAL UNIVERSITY
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