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Method for preparing bismuth-enriched bismuth oxybromide photocatalyst

A bismuth-rich bismuth oxybromide and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of weak photocatalyst performance and high cost, and achieve the effects of easy operation, remarkable effect and low solvent cost

Inactive Publication Date: 2018-05-04
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually bismuth-based semiconductor photocatalytic materials such as Bi 4 o 5 Br 2 It is often prepared by solvothermal method and has certain photocatalytic activity, but the limitations of the preparation method lead to Bi 4 o 5 Br 2 The performance of photocatalyst is weak and the cost is high

Method used

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preparation example Construction

[0014] The preparation method of a bismuth-rich bismuth oxybromide photocatalyst of the present invention is characterized in that a certain amount of polymer is added to a mixed solvent of a specific ratio, the pH value of the mixed solvent is adjusted, and bismuth-rich is synthesized in one step by a solvothermal method Bismuth oxybromide Bi 4 o 5 Br 2 Photocatalyst, the prepared bismuth-rich bismuth oxybromide Bi 4 o 5 Br 2 It has efficient visible light catalytic performance, and the specific steps are:

[0015] Measure glycerol and deionized water with a total volume of 30mL into a beaker at a ratio of 1:1 to 1:5, accurately weigh 1.5mmol of bismuth nitrate pentahydrate, add it, stir until clear and transparent, and then accurately weigh Add 1.5mmol of bromine source to the above solution, continue to stir for 0.5~1h, at this time, accurately weigh 0.1~0.5g of polymer, add it to the above solution, and immediately add -1 Sodium hydroxide solution to adjust the pH va...

Embodiment 1

[0017] Implementation example 1: a kind of preparation method of bismuth-rich bismuth oxybromide photocatalyst of the present invention comprises the following steps:

[0018] Measure 15 mL of glycerol and deionized water with a total volume of 30 mL into a beaker at a ratio of 1:1. Under magnetic stirring, accurately weigh 1.5 mmol of bismuth nitrate pentahydrate and add it, stir until it is clear, and then Accurately weighed 1.5mmol of cetyltrimethylammonium bromide was added to the above solution, and continued to stir for 30min. At this time, accurately weighed 0.1g of polyethylene glycol (PEG10000) was added to the above solution, and immediately used 1mol L -1 Adjust the pH value of the above solution to 11, stir until a uniform white suspension is formed, pour the solution into a 50mL stainless steel autoclave lined with polytetrafluoroethylene, and react at 140°C for 24h. The obtained product was centrifuged, first washed with hot water to remove the residual organic ...

Embodiment 2

[0020] Implementation example 2: a kind of preparation method of bismuth-rich bismuth oxybromide photocatalyst of the present invention comprises the following steps:

[0021]Measure 5mL and 25mL of glycerol and deionized water with a total volume of 30mL into a beaker at a ratio of 1:5, and accurately weigh 1.5mmol of bismuth nitrate pentahydrate into the beaker under magnetic stirring, and stir until clear and transparent , then accurately weigh 1.5mmol of cetyltrimethylammonium bromide and join in the above solution, continue to stir for 30min, now accurately weigh 0.3g of polyethylene glycol (PEG2000) and join in the above solution, and Immediately use 1mol·L -1 Adjust the pH value of the above solution to 10, stir until a uniform white suspension is formed, pour the solution into a 50mL stainless steel autoclave lined with polytetrafluoroethylene, and react at 140°C for 24h, The obtained product was centrifuged, first washed with hot water to remove the residual organic ...

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Abstract

The invention discloses a method for preparing a bismuth-enriched bismuth oxybromide photocatalyst and belongs to the field of photocatalysis. The method is mainly characterized in that heavy doping of bismuth oxybromide can be realized under actions of a certain pH value and polymer guide, and a novel bismuth-enriched bismuth oxybromide Bi4O5Br2 photocatalytic material is obtained and has excellent visible-light catalytic activity. The method comprises the following preparation steps: mixing glycerin and deionized water into a beaker according to a certain ratio, adding bismuth nitrate pentahydrate, adding a bromine source while stirring to be clarified and transparent, fully stirring, adding a polymer guide agent, and regulating the pH value of the solution with a sodium hydroxide solution; continuously stirring until uniform white suspension is formed, transferring the suspension into a high-pressure reactor, reacting at a high temperature for a certain time, performing centrifugalseparation on the obtained product, washing for several times, and drying, thereby obtaining the bismuth-enriched bismuth oxybromide Bi4O5Br2 photocatalyst. The method is simple in process, low in cost and easy to operate and realize, and the prepared bismuth-enriched bismuth oxybromide Bi4O5Br2 photocatalyst has high visible-light catalytic activity and is expected to be applied to degradation ofenvironmental pollutants.

Description

technical field [0001] The invention belongs to the photocatalytic technology in the field of environmental protection, and relates to the preparation of bismuth-rich bismuth oxybromide Bi 4 o 5 Br 2 Photocatalyst, obtained bismuth-rich bismuth oxybromide Bi 4 o 5 Br 2 Photocatalysts have efficient visible light catalytic performance. Background technique [0002] Due to people's excessive pursuit of economic development speed without strong environmental awareness, it leads to a large amount of non-renewable energy consumption and environmental pollution. As a green, non-polluting and sustainable energy source, solar energy occupies an important position in today's relatively scarce resources. Photocatalytic technology can convert natural light and artificial lighting into chemical energy that can be used by people, and can also decompose organic matter in polluted water into small inorganic molecules such as water and carbon dioxide under light conditions to degrade ...

Claims

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Application Information

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IPC IPC(8): B01J27/06B01J37/08C01G29/00C02F1/30
CPCC01G29/00C02F1/30B01J27/06C02F2305/10B01J35/39
Inventor 段芳路姗姗李金祥马道凯施冬健陈明清
Owner JIANGNAN UNIV
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