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Method for preparing photocatalytic biochar composite material by using eichhornia crassipes to accumulate nano-zinc oxide

A technology of nano-zinc oxide and composite materials, which is applied in the field of photocatalytic materials, can solve the problems of cumbersome steps, increased consumption of experimental materials and reagents, and complicated operations, so as to improve the photocatalytic effect, avoid calcination and agglomeration deactivation, and reduce hazards Effect

Active Publication Date: 2019-11-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After tetracycline is used, it will enter the municipal pipe network through excrement, and then be discharged into the sewage treatment plant. At present, most sewage treatment plants do not have a treatment process for tetracycline antibiotics.
However, the current method of combining nano-zinc oxide with biochar is artificially loaded by some physical or chemical means. These loading methods are often cumbersome and complicated to operate, which increases the consumption of experimental materials and reagents, and virtually increases the experimental efficiency. cost

Method used

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  • Method for preparing photocatalytic biochar composite material by using eichhornia crassipes to accumulate nano-zinc oxide
  • Method for preparing photocatalytic biochar composite material by using eichhornia crassipes to accumulate nano-zinc oxide
  • Method for preparing photocatalytic biochar composite material by using eichhornia crassipes to accumulate nano-zinc oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0037] A method for preparing a photocatalytic biochar composite material by using water hyacinth to accumulate nanometer zinc oxide, the specific steps are as follows:

[0038] (1) Take water hyacinths grown in natural lakes with a fresh weight of 20-30 g and consistent growth, wash them with distilled water and prepare them for use, prepare Hoagland nutrient solution and nano-zinc oxide solution (crushing with an ultrasonic crusher for 1 hour), Mix 5mL of nutrient solution with the nano-zinc oxide solution after ultrasonic crushing for 1h, add distilled water to make 1L culture solution (in which the concentration of nano-zinc oxide is 100mg / L), put water hyacinth in the culture solution and test it under laboratory conditions. For cultivation, the laboratory conditions are 12 hours of light during the day, the light intensity is 12000 Lux, and 12 hours in the dark at night, and the day and night temperatures are 24°C and 22°C respectively;

[0039] (2) After the water hyaci...

Embodiment 2

[0045] A method for preparing a photocatalytic biochar composite material by using water hyacinth to accumulate nanometer zinc oxide, the specific steps are as follows:

[0046] (1) Take water hyacinths grown in natural lakes with a fresh weight of 20-30 g and consistent growth, wash them with distilled water and prepare them for use, prepare Hoagland nutrient solution and nano-zinc oxide solution (crushing with an ultrasonic crusher for 1 hour), Mix 5mL of nutrient solution with nano-zinc oxide solution after ultrasonic crushing for 1h, add distilled water to make 1L culture solution (wherein the concentration of nano-zinc oxide is 200mg / L), put water hyacinth in the culture solution and test it under laboratory conditions. For cultivation, the laboratory conditions are 12 hours of light during the day, the light intensity is 12000 Lux, and 12 hours in the dark at night, and the day and night temperatures are 24°C and 22°C respectively;

[0047] (2) After the water hyacinth i...

Embodiment 3

[0053] A method for preparing a photocatalytic biochar composite material by using water hyacinth to accumulate nanometer zinc oxide, the specific steps are as follows:

[0054] (1) Take water hyacinths grown in natural lakes with a fresh weight of 20-30 g and consistent growth, wash them with distilled water and prepare them for use, prepare Hoagland nutrient solution and nano-zinc oxide solution (crushing with an ultrasonic crusher for 1 hour), Mix 5mL of nutrient solution with the nano-zinc oxide solution after ultrasonic crushing for 1h, add distilled water to make 1L culture solution (in which the concentration of nano-zinc oxide is 400mg / L), put water hyacinth in the culture solution and test it under laboratory conditions. For cultivation, the laboratory conditions are 12 hours of light during the day, the light intensity is 12000 Lux, and 12 hours in the dark at night, and the day and night temperatures are 24°C and 22°C respectively;

[0055] (2) After the water hyaci...

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Abstract

The invention relates to a method for preparing a photocatalytic biochar composite material by using eichhornia crassipes to accumulate nano-zinc oxide. The method for preparing the photocatalytic biochar composite material by using the eichhornia crassipes to accumulate the nano-zinc oxide comprises the following specific steps that (1) the eichhornia crassipes growing in a natural lake is selected, washed by distilled water and placed in a culture solution containing the nano-zinc oxide for cultivation, the eichhornia crassipes is taken out and washed after cultivation for 15-45 days, and the eichhornia crassipes is subjected to drying and smashed for standby application; and (2) the smashed eichhornia crassipes is calcined under an inert atmosphere, and cooling and processing are carried out to obtain the nano-zinc oxide-biochar photocatalytic composite material. According to the method for preparing the photocatalytic biochar composite material by using the eichhornia crassipes toaccumulate the nano-zinc oxide, the eichhornia crassipes is used as a biochar source, and the eichhornia crassipes is inundated in many eutrophic waters in recent years as an alien species. The methodfor preparing the photocatalytic biochar composite material by using the eichhornia crassipes to accumulate the nano-zinc oxide turns waste to wealth, resource utilization of the eichhornia crassipesis realized, the forbidden bandwidth of nano-zinc oxide semi-conductor can be suitably reduced, so that the material is easier motivated by an ultraviolet lamp, and the photocatalytic effect of the material is improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a method for preparing a photocatalytic biochar composite material by using water hyacinth to accumulate nanometer zinc oxide. Background technique [0002] Tetracycline antibiotics are widely used in my country due to their low price. After tetracycline is used, it will enter the municipal pipe network through excrement and then be discharged into the sewage treatment plant. At present, most sewage treatment plants do not have a treatment process for tetracycline antibiotics. Therefore, tetracycline will flow into natural waters with the effluent of the sewage plant, causing pollution to the water environment. [0003] Nano-zinc oxide is used as a photocatalyst due to its small particle size, large specific surface area, and high chemical activity. Under ultraviolet light irradiation, nano-zinc oxide will be excited to generate highly oxidizing fre...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J35/10C02F1/30C02F101/38
CPCB01J23/06C02F1/30C02F2101/38B01J35/394B01J35/61B01J35/39Y02A90/40
Inventor 李孟许入义张倩
Owner WUHAN UNIV OF TECH
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