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Floatable photocatalyst for inhibiting blue algae in water as well as preparation method and application of photocatalyst

A photocatalyst and water suppression technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as unfavorable reuse, difficult catalyst recovery, insufficient light utilization rate, etc., and achieve excellent photoelectricity. Conversion efficiency, excellent visible light photocatalytic activity, and the effect of improving photocatalytic performance

Inactive Publication Date: 2017-12-26
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently commonly used nano-powder photocatalysts have some shortcomings when treating a wide range of algae in water. For example, nano-powder photocatalysts are easy to agglomerate and settle in water, resulting in insufficient light utilization and low efficiency.
In addition, there are problems such as difficult recovery of catalysts, unfavorable reuse, and even secondary pollution.

Method used

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  • Floatable photocatalyst for inhibiting blue algae in water as well as preparation method and application of photocatalyst
  • Floatable photocatalyst for inhibiting blue algae in water as well as preparation method and application of photocatalyst
  • Floatable photocatalyst for inhibiting blue algae in water as well as preparation method and application of photocatalyst

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preparation example Construction

[0031] The present invention also provides a preparation method of the photocatalyst described in the above technical solution, comprising the following steps:

[0032] Bismuth nitrate is mixed with ethylene glycol methyl ether to obtain a bismuth nitrate solution;

[0033] Mixing thiourea, potassium bromide, ethylene glycol methyl ether and expanded perlite to obtain a mixed material liquid;

[0034] Adding the bismuth nitrate solution dropwise to the mixture liquid to obtain a suspension;

[0035] The suspension undergoes solvothermal reaction to obtain a floating photocatalyst that inhibits cyanobacteria in water.

[0036] The invention mixes bismuth nitrate and ethylene glycol methyl ether to obtain a bismuth nitrate solution. In the present invention, the concentration of the bismuth nitrate solution is preferably 0.1-0.3 mol / L, more preferably 0.2-0.25 mol / L. In the present invention, the mixing is preferably ultrasonic, and the present invention has no special limita...

Embodiment 1

[0051] Weigh 1mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 mL of ethylene glycol methyl ether, and ultrasonicated for 15 minutes to obtain a colorless bismuth nitrate solution; 2.4 mmol of thiourea and 0.7 mmol of KBr were dissolved in 30 mL of ethylene glycol methyl ether, ultrasonicated for 15 min, and stirred until a colorless and transparent solution was obtained. Weigh 1 g of EP and add it to the colorless transparent solution, and stir mechanically for 30 minutes to obtain the mixture. Under mechanical stirring, add the bismuth nitrate solution dropwise to the mixture, mix well to obtain a yellow EP suspension, and then let it stand for 30 minutes. Transfer to a high-pressure reactor and react at 120°C for 12 hours. After natural cooling, filter the sample with suction and wash with a large amount of deionized water, and dry it at 60°C to obtain a brown EP-Bi 2 S 3 / BiOBr.

Embodiment 2

[0053] Weigh 1.5mmol Bi(NO 3 ) 3 ·5H 2 O was dissolved in 10 mL of ethylene glycol methyl ether, and ultrasonicated for 15 minutes to obtain a colorless bismuth nitrate solution; 2.4 mmol of thiourea and 0.7 mmol of KBr were dissolved in 30 mL of ethylene glycol methyl ether, ultrasonicated for 15 min, and stirred until a colorless and transparent solution was obtained. Weigh 1 g of EP and add it to the colorless transparent solution, and stir mechanically for 30 minutes to obtain the mixture. Under mechanical stirring, add the bismuth nitrate solution dropwise to the mixture, mix well to obtain a yellow EP suspension, and then let it stand for 30 minutes. Transfer to a high-pressure reactor and react at 130°C for 18 hours. After natural cooling, filter the sample with suction and wash with a large amount of deionized water, and dry it at 60°C to obtain a brown EP-Bi 2 S 3 / BiOBr.

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Abstract

The invention provides a floatable photocatalyst for inhibiting blue algae in water, belonging to the field of photocatalysts. The floatable photocatalyst comprises expanded perlite, bismuth oxybromide nanoflowers wrapped on the outer surface of the expanded perlite and bismuth sulfide nanowires wound on the surfaces of the bismuth oxybromide nanoflowers. According to the invention, bismuth oxybromide has higher chemical stability and excellent visible light photocatalytic activity, bismuth sulfide has higher sunlight absorption coefficient and excellent photoelectric conversion efficiency, heterojunctions formed on an interface of Bi2S3 and BiOBr can improve photocatalytic performance of the photocatalyst, the expanded perlite has good floatability, the floatable photocatalyst can be obtained and can automatically float on the water under the condition that a system is not stirred or naturally illuminated, and the utilization rate of lights and O2 during photocatalysis reaction is improved to the utmost extent, so that higher photocatalytic efficiency is obtained; meanwhile, the floatable photocatalyst can be dripped in large area, is easy to intercept and recycle and has practical and development values.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a floating photocatalyst for inhibiting cyanobacteria in water, a preparation method and application thereof. Background technique [0002] The eutrophication of water bodies has become one of the most important environmental problems in my country and even in the world. With the intensification of eutrophication in global water bodies, the outbreaks of toxic and harmful algae, especially cyanobacteria blooms, are becoming more and more frequent, causing environmental and economic problems. increasingly attracted people's attention. At the same time, with the improvement of people's requirements for the quality of drinking water, the problem of algal toxin pollution caused by cyanobacteria blooms has also attracted more and more attention. Therefore, to reduce the degree of eutrophication of water bodies, it is imperative to seek effective ways to prevent and control water...

Claims

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Application Information

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IPC IPC(8): B01J27/04B01J37/08C02F1/30
CPCC02F1/30B01J27/04B01J37/08C02F2305/10B01J35/39
Inventor 涂新满林协昌罗胜联代威力罗旭彪
Owner NANCHANG HANGKONG UNIVERSITY
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