Method for preparing reusable and efficient carbon-nitride-based composite photocatalyst

A technology of composite photocatalyst, applied in the field of photocatalysis, can solve the problems of short free diffusion distance of photogenerated carriers and poor photocatalytic activity, and achieve the effects of avoiding complicated valence state, simple preparation process and uniform size distribution

Inactive Publication Date: 2019-12-10
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the free diffusion distance of photogenerated carriers is short and easy to recombine, so its photocatalytic activity is poor.

Method used

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  • Method for preparing reusable and efficient carbon-nitride-based composite photocatalyst
  • Method for preparing reusable and efficient carbon-nitride-based composite photocatalyst
  • Method for preparing reusable and efficient carbon-nitride-based composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1g-C 3 N 4 Preparation of base composite photocatalyst 1

[0034] Add 5g of urea to a 50ml beaker, add 10ml of deionized water, and stir vigorously for 15min to obtain a clear solution; add 0.5g of Fe(NO 3 ) 3 , continue to stir for 15 minutes, after fully mixing, place the beaker in a vacuum drying oven; continue drying in the drying oven at 120°C until the solution is completely evaporated, and collect the powder; put the obtained powder into a dry and clean flat-bottomed crucible, and seal it tightly with aluminum foil. wrapped, and then placed in a closed tube furnace; in a nitrogen atmosphere, calcined at a high temperature of 550 °C for 2 h, with a heating rate of 5 °C / min, and naturally cooled to room temperature; the obtained product was washed with absolute ethanol and deionized water for 3 times, centrifuged, and then placed in a vacuum drying oven at 80 ° C for 12 hours to obtain the g-C of the present invention 3 N 4 based composite photocatalys...

Embodiment 2

[0035] Example 2g-C 3 N 4 Preparation of base composite photocatalyst 2

[0036] Add 5g of melamine into a 50ml beaker, add 10ml of deionized water, and stir vigorously for 15min to obtain a clear solution; add 0.5g of FeCl to the solution 3 ·6H 2 O, continue to stir for 15 minutes, after fully mixing evenly, place the beaker in a vacuum drying oven; continue drying in the drying oven at 120°C until the solution is completely evaporated, and collect the powder; put the obtained powder into a dry and clean flat-bottomed crucible, and seal it tightly with aluminum foil. wrapped, and then placed in a closed tube furnace; in an argon atmosphere, calcined at a high temperature of 550 °C for 2 h, with a heating rate of 5 °C / min, and naturally cooled to room temperature; the obtained product was washed with absolute ethanol and deionized water 3 times, centrifuged, and then placed in a vacuum drying oven at 80 ° C for 12 hours to obtain the Fe of the present invention 2 o 3 / g -...

Embodiment 3

[0039] Example 3g-C 3 N 4 Preparation of base composite photocatalyst 3

[0040] Add 2.5g of melamine into a 50ml beaker, add 10ml of deionized water, and stir vigorously for 15min to obtain a clear solution; add 0.5g of Fe(CH 3 COO) 3 , continue to stir for 15 minutes, after fully mixing evenly, put the beaker in a vacuum drying oven; continue drying in the drying oven at 120°C until the solution is completely evaporated, and collect the powder; put the obtained powder into a dry and clean flat-bottomed crucible, and wrap it tightly with aluminum foil , and then placed in a closed tube furnace; in a helium atmosphere, calcined at a high temperature of 550 ° C for 2 h, the heating rate was 5 ° C / min, and naturally cooled to room temperature; the obtained product was washed with absolute ethanol and deionized water for 3 time, centrifuged, and then placed in a vacuum drying oven at 80 ° C for more than 12 hours to obtain the sample of the present invention.

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Abstract

The invention discloses a method for preparing a reusable and efficient g-C3N4-based composite photocatalyst, and belongs to the technical field of photocatalysis. The method for preparing the reusable and efficient g-C3N4-based composite photocatalyst comprises the following steps that S1, deionized water is added to a carbon and nitrogen source, and the mixture is vigorously stirred to obtain asettled solution for standby application; S2, iron salt is added to the settled solution obtained in the S1, the mixture is continued to be stirred to enable the mixture to be fully mixed and then dried until the solution completely evaporates, and powder is collected; S3, the powder obtained in the S2 is placed in an inert gas atmosphere, the mixture is calcined at 500 DEG C-600 DEG C for 1-3 h,and the mixture is cooled naturally to room temperature; and S4, a product obtained in the step S3 is washed with anhydrous ethanol and deionized water three times each, and the product is subjected to centrifugal separation and then dried to obtain the g-C3N4-based composite photocatalyst. The prepared g-C3N4-based composite photocatalyst can achieve efficient degradation of methyl orange throughphotocatalysis under the action of sunlight, and has the advantages of being recyclable and reusable and high in degradation efficiency.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a reusable high-efficiency g-C 3 N 4 Preparation method of base composite photocatalyst. Background technique [0002] Energy crisis and environmental degradation are two major problems facing human society. With the development of economy, people pay more and more attention to ecological environment and energy issues. Solving the problems of energy crisis and environmental pollution is to improve the quality of life of our people, The urgent need to realize the sustainable development of the country. Therefore, it is imminent to develop clean and effective environmental governance and energy technologies. Thanks to g-C 3 N 4 The bandgap width is 2.7eV, and it has the advantages of high photocatalytic activity, good stability, and cheap raw material prices, making it a research hotspot of new photocatalytic materials, and it is also used in the photocatalytic degradat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCB01J27/24B01J35/004C02F1/30C02F2101/308C02F2101/40
Inventor 古兴兴周晓松
Owner CHONGQING TECH & BUSINESS UNIV
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