Composite photocatalyst, and preparation method and application of composite photocatalyst

A catalyst and composite light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of refractory antibiotics that have not been studied, and achieve obvious electrical conductivity and photocatalytic activity, no Toxic side effects, high degradation efficiency

Active Publication Date: 2018-10-16
SOUTH CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon nitride has excellent photodegradation performance under visible light. This material is a 2D nanosheet non-metallic photocatalytic material, which has both visible light response and good stability. It is used in photocatalytic hydrogen production, water oxidation, and organic degradation. , photosynthesis, and carbon dioxide reduction and other fields have important research value. At present, the composite photocatalyst based on carbonized nitrogen is mainly used to degrade dyes, but no research has been done on antibiotics that are more difficult to degrade.

Method used

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  • Composite photocatalyst, and preparation method and application of composite photocatalyst
  • Composite photocatalyst, and preparation method and application of composite photocatalyst
  • Composite photocatalyst, and preparation method and application of composite photocatalyst

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Embodiment 1

[0031] Take 3g dicyandiamide and 15g NH 4 Cl was fully mixed, stirred and dried at 80°C, then put the obtained material into a muffle furnace and raised the temperature to 550°C at a heating rate of 3°C / min, and reacted for 4 hours to obtain nanosheet layered C 3 N 4 , and its photo under the scanning electron microscope (SEM) at 15000 times magnification is as follows figure 1 As shown, it can be seen from the figure that compared with ordinary nitrogen carbide materials (C 3 N 4 ), the carbonized nitrogen (g-C 3 N 4 ) is a two-dimensional nanosheet structure with a hollow structure, which greatly increases the specific surface area of ​​the material, thereby maximizing its degradation efficiency.

[0032] Then take 0.12 g of KBr, dissolve it in deionized water, and ultrasonicate for 5 min to form a uniformly dispersed solution. Take 0.7g of the above-mentioned nanosheet layered C 3 N 4 Added to the above solution, ultrasonic 5min. Then put in the amount of Bi(NO 3 ...

Embodiment 2

[0037] Get the nanosheet layered C in 0.1g embodiment 1 respectively 3 N 4 、C 3 N 4 / BiOBr and C 3 N 4 / BiOBr / black phosphorus was placed in 150mL, 10mg / L tetracycline solution, stirred under xenon lamp loaded with 1.5AM, 420nm filter, and reacted. First react in dark for 30min, and then take samples every 30min under the irradiation of xenon lamp.

[0038] Gained sample is centrifuged at last, tested under ultraviolet spectrophotometer (UV-vis), degradation effect is as follows: Figure 5 As shown, it can be seen from the figure that the degradation efficiency of the composite photocatalyst prepared by the present invention is as high as 85%.

[0039] Experimental result shows that composite photocatalyst of the present invention (C 3 N 4 / BiOBr / black phosphorus) has significant degradation efficiency for tetracycline antibiotics under light, improving the simple C 3 N 4 The degradation efficiency is low and the rate is slow.

Embodiment 3

[0041] Get C in 0.3g embodiment 1 3 N 4 / BiOBr / black phosphorus composite photocatalyst was placed in 100mL, 50mg / L tetracycline solution, stirred under xenon lamp loaded with 1.5AM, 420nm filter, and reacted. First react in dark for 30 minutes, and then take samples every 30 minutes under the irradiation of xenon lamp.

[0042] The final degradation efficiency can be as high as 85%, which has a relatively high degradation efficiency.

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Abstract

The invention discloses a composite photocatalyst, and a preparation method and the application of the composite photocatalyst. The preparation method of the composite catalyst comprises the steps ofdissolving bismuth salt in a solvent, adding carbonized nitrogen for uniform dispersion, adding bromide for dispersion, putting in a high-pressure reaction kettle for reaction, and adding a dispersingliquid of black phosphorus at last for stirring and reaction to form the nanosheet composite photocatalyst having bismuth oxybromide growing on carbonized nitrogen and dispersed with black phosphorusparticles. The preparation method is simple, and the prepared composite photocatalyst has better application prospects in antibiotic degradation.

Description

technical field [0001] The invention relates to the fields of electrochemistry and photodegradation catalysis, in particular to a composite photocatalyst and its preparation method and application. Background technique [0002] Due to the awareness and concern of environmental pollution, there is an increasing demand for new environmental remediation technologies, especially a large number of broad-spectrum antibiotics, such as ciprofloxacin (CIP) and tetracycline hydrochloride (TC), which are used to treat the more polluted The increasing number of lakes, rivers, and oceans has caused various adverse effects on ecosystems and poses a huge threat to human health, so it is urgent to find a green and sustainable way to solve the problem of antibiotic pollution in aquatic environments. [0003] Among the potential solutions, semiconductor photocatalysis using the inexhaustible solar energy as the driving force has become one of the most attractive technologies, which can degrad...

Claims

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Application Information

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IPC IPC(8): B01J27/24C02F1/30C02F101/30C02F101/34C02F101/38
CPCC02F1/30B01J27/24C02F2305/10C02F2101/38C02F2101/34C02F2101/305B01J35/39
Inventor 王新江天昊陈志鸿金名亮周国富
Owner SOUTH CHINA NORMAL UNIVERSITY
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