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Silver phosphate/hydrothermal biocarbon composite photocatalyst and preparation method and application thereof

A technology of biochar and silver phosphate, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, water pollutants, etc., can solve the problems of weak photocatalytic performance, high photogenerated electron-hole recombination rate, poor stability, etc. Achieve low processing cost, improve photocatalytic performance, and good stability

Inactive Publication Date: 2019-11-08
SHANGHAI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silver phosphate has disadvantages such as high photogenerated electron-hole recombination rate, poor stability, and weak photocatalytic performance in the application process.

Method used

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  • Silver phosphate/hydrothermal biocarbon composite photocatalyst and preparation method and application thereof
  • Silver phosphate/hydrothermal biocarbon composite photocatalyst and preparation method and application thereof
  • Silver phosphate/hydrothermal biocarbon composite photocatalyst and preparation method and application thereof

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preparation example Construction

[0036] The present invention provides the preparation method of the silver phosphate / hydrothermal biochar composite photocatalyst described in the above scheme, comprising the following steps:

[0037] Disperse the branch powder in water and carry out hydrothermal reaction to obtain hydrothermal biochar;

[0038] After the dispersion liquid of the hydrothermal biochar is mixed with the soluble silver salt, a solution containing phosphate ions is added to the mixed system, and a precipitation reaction is carried out to obtain a silver phosphate / hydrothermal biochar composite photocatalyst.

[0039] The present invention disperses the branch powder into water to obtain the dispersion liquid of the branch powder.

[0040] The present invention has no special requirements on the type of branches, and any branches known in the art that can be used to prepare biochar can be used. In a specific embodiment of the present invention, the branch is preferably a discarded osmanthus tree ...

Embodiment 1

[0058] Silver phosphate / hydrothermal biochar composite photocatalyst (0.05C / Ag 3 PO 4 ) preparation method, comprising the following steps:

[0059] (1) Break up the discarded branches that have been cleaned and dried, and pass through a 100-mesh sieve. Add 6g of sawdust to 60mL of deionized water and stir for 2h, then transfer to a hydrothermal reaction kettle, program temperature rise at 8°C / min to 200°C, and keep for 5h. The resulting mixture was centrifuged at 8000 rpm, washed, dried at a temperature of 100° C., and ground to obtain a black powdery hydrothermal biochar, denoted as C.

[0060] (2) Disperse 0.05 g of the hydrothermal biochar obtained in step (1) into 40 mL of deionized water by ultrasonication for 4 h, then add 60 mL of 0.03 M silver acetate into it and magnetically stir for 1 h, then add 4 mL of 0.15 M silver acetate during the stirring process The disodium hydrogen phosphate solution was added dropwise to the above solution, and stirred at 400rpm for 2h...

Embodiment 2

[0063] Preparation method is the same as 0.05C / Ag in embodiment 1 3 PO 4 , the only difference is that the mass of 0.05g hydrothermal biochar in the above step (2) is changed to 0.1, 0.2, 0.3 and 0g respectively, and the obtained products are recorded as 0.1C / Ag 3 PO 4 , 0.2C / Ag 3 PO 4 , 0.3C / Ag 3 PO 4 and Ag 3 PO 4 .

[0064] Among them, 0.1C / Ag 3 PO 4 , 0.2C / Ag 3 PO 4 , 0.3C / Ag 3 PO 4 and Ag 3 PO 4 The mass percentage of medium hydrothermal biochar is 28.5%, 44.3%, 54.4% and 0%.

[0065] figure 1 It is the SEM image of the photocatalyst made in Example 1 of the present invention, wherein a is hydrothermal biochar, b is pure silver phosphate, and c is 0.1C / Ag 3 PO 4 composite photocatalyst. Depend on figure 1 It can be seen that hydrothermal biochar forms a porous structure; pure silver phosphate is similar to a spherical structure with a particle size of about 550nm; in the silver phosphate / hydrothermal biochar composite photocatalyst, the shape of silve...

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Abstract

The invention relates to the field of water treatment, and especially relates to a silver phosphate / hydrothermal biocarbon composite photocatalyst and a preparation method and an application thereof.The silver phosphate / hydrothermal biocarbon composite photocatalyst provided by the invention includes hydrothermal biocarbon and silver phosphate dispersed on the surface of the hydrothermal biocarbon. According to the silver phosphate / hydrothermal biocarbon composite photocatalyst and the preparation method and the application thereof, the biocarbon prepared by a hydrothermal method is used as acarrier, and has rich gaps and oxygen-containing functional groups, after being combined with the silver phosphate, the hydrothermal biocarbon changes a crystal form structure of the silver phosphate, which is beneficial to adsorb pollutants; and the separation efficiency of photoelectron-hole in the photocatalyst is accelerated, the stability during an application process is increased, and the photocatalytic performance is improved. Results show that the silver phosphate / hydrothermal biocarbon composite photocatalyst of the invention has the advantages of strong light absorption capability,low recombination rate of the photoelectron-hole, good photocatalytic performance, good stability, and the like, can be used for photocatalytic removal of antibiotics in polluted water bodies, and hasgood cycle stability.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a silver phosphate / hydrothermal biochar composite photocatalyst and a preparation method and application thereof. Background technique [0002] In recent years, the pollution of antibiotic organic pollutants to water bodies has received widespread attention. The use of antibiotics in my country has reached 30% of the drug consumption, but antibiotics cannot be completely absorbed and degraded during use, and most of them are discharged into the natural environment, polluting surface water and groundwater. The detection rate of antibiotics in environmental water is gradually frequent, and the concentration is high. In natural water, the pollution concentration of sulfadiazine is as high as 1160 μg / L, while in the sewage environment, the pollution concentration of sulfamethoxazole is as high as 2390 μg / L. It can be seen that antibiotics have already become a new type of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18C02F1/30C02F101/38
CPCB01J27/1817C02F1/30C02F2101/40C02F2305/10B01J35/39
Inventor 邹国燕周丽辛立勋崔娜欣张旭蔡敏陈桂发
Owner SHANGHAI ACAD OF AGRI SCI
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