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Preparation method for carbon doped photocatalyst

A technology of photocatalyst and tantalum pentoxide, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., to improve the catalytic effect and facilitate the electron transfer

Inactive Publication Date: 2018-05-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some studies have shown that returning crop straw to the field can improve soil fertility and reduce air pollution, it is not the best choice from an economic point of view

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] After pulverizing the rice straw, heat it to 450°C under oxygen-limited conditions, keep the temperature for 5 hours, and partially carbonize the rice straw; mix the partially carbonized rice straw powder and tantalum pentoxide powder at a mass ratio of 6:1, add Make a paste with a small amount of deionized water, and continue to mix evenly. After fully mixing the partially carbonized rice straw powder and tantalum pentoxide, transfer it to an autoclave, raise the temperature to 180°C within 1 hour, and continue to react for 8 hours. After cooling to room temperature, potassium tantalate is formed during the process, washed three times with deionized water, dried, and ground to obtain a carbon-doped photocatalyst.

[0012] The prepared carbon-doped photocatalyst was used to treat methylene blue-containing wastewater: 0.5 g of carbon-doped photocatalyst was added to 50 mL of methylene blue wastewater with a concentration of 25 mg / L, and it was reacted for 30 minutes under...

Embodiment 2

[0015] After pulverizing the rice straw, heat it to 300°C under oxygen-limited conditions, keep the temperature for 3 hours, and partially carbonize the rice straw; mix the partially carbonized rice straw powder and tantalum pentoxide powder at a mass ratio of 4:1, add Make a paste with a small amount of deionized water, and continue to mix evenly. After fully mixing the partially carbonized rice straw powder and tantalum pentoxide, transfer it to an autoclave, raise the temperature to 150°C within 1 hour, and continue to react for 4 hours. After cooling to room temperature, potassium tantalate is formed during the process, washed twice with deionized water, dried, and ground to obtain a carbon-doped photocatalyst.

[0016] The prepared carbon-doped photocatalyst was used to treat methylene blue-containing wastewater: 0.5 g of carbon-doped photocatalyst was added to 50 mL of methylene blue wastewater with a concentration of 25 mg / L, and it was reacted for 30 minutes under the i...

Embodiment 3

[0019] After pulverizing the rice straw, heat it to 350°C under oxygen-limited conditions, keep the temperature for 4 hours, and partially carbonize the rice straw; mix the partially carbonized rice straw powder and tantalum pentoxide powder at a mass ratio of 5:1, add Make a paste with a small amount of deionized water, and continue to mix evenly. After fully mixing the partially carbonized rice straw powder and tantalum pentoxide, transfer it to an autoclave, raise the temperature to 160°C within 1 hour, and continue to react for 7 hours. After cooling to room temperature, potassium tantalate is formed during the process, washed three times with deionized water, dried, and ground to obtain a carbon-doped photocatalyst.

[0020] The prepared carbon-doped photocatalyst was used to treat wastewater containing Golden Orange II: 0.5 g of carbon-doped photocatalyst was added to 50 mL of Golden Orange II wastewater with a concentration of 25 mg / L, and reacted for 30 minutes under th...

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Abstract

The invention discloses a preparation method for a carbon doped photocatalyst. The method sequentially comprises the following steps: 1) smashing rice straw, performing heating to the temperature of 300-450 DEG C under limited oxygen conditions, and keeping the temperature for 3-5h to partially carbonize the rice straw; 2) performing uniform mixing on the partially-carbonized rice straw powder andtantalum pentoxide powder at a mass ratio of (4-6):1, adding a small amount of deionized water to make a paste, continuing to perform uniform mixing, after the partially-carbonized rice straw powderand the tantalum pentoxide are mixed fully, transferring the mixed material into an autoclave, raising the temperature to 150-180 DEG C within 1h, continuing to perform a reaction for 4-8h, performingnatural cooling to room temperature, wherein potassium tantalate is formed in the process, then performing washing with deionized water for 2-3 times, performing drying, and performing grinding, so as to obtain the carbon-doped photocatalyst. According to the method provided by the invention, a carbon-doped potassium tantalate precipitate is formed at the surface of silicon dioxide, and the structure facilitates the adsorption and catalysis of contaminants, facilitates electron transfer and improves the catalytic effects.

Description

technical field [0001] The invention relates to the development of new materials for environmental pollution control, in particular to a preparation method of a carbon-doped photocatalyst. Background technique [0002] The use of semiconductor materials to split water and photocatalytic oxidation to degrade organic pollutants is currently a research hotspot in the field of energy and environmental purification. The research and development of new, high-efficiency, and visible-light-responsive photocatalytic materials to improve the utilization rate of sunlight has become a key issue in the field of photocatalysis, and it is also a prerequisite for the final realization of the industrial application of photocatalysis technology. There are two main ideas in the study of photocatalysts that respond to visible light: one is to modify the existing photocatalytic materials that respond to ultraviolet light to expand the photoresponsive area to the visible light range; the other is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/20C02F1/30C02F1/28C02F101/30
CPCC02F1/281C02F1/30B01J23/20C02F2101/308B01J35/39
Inventor 张凤欢马建锋
Owner CHANGZHOU UNIV
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