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Preparation method and application of cobalt-loaded mesoporous graphite-phase carbon nitride visible-light-induced catalyst

A graphite-phase carbon nitride and cobalt-loaded mesoporous technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high cost and limited application of loaded precious metals, and achieve catalytic activity Enhanced, good reference value, high stability effect

Inactive Publication Date: 2013-08-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst prepared in this study has high photocatalytic activity, but the high cost of supporting noble metals limits its application in actual industry

Method used

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  • Preparation method and application of cobalt-loaded mesoporous graphite-phase carbon nitride visible-light-induced catalyst
  • Preparation method and application of cobalt-loaded mesoporous graphite-phase carbon nitride visible-light-induced catalyst
  • Preparation method and application of cobalt-loaded mesoporous graphite-phase carbon nitride visible-light-induced catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Mix silica sol HS-40 and cyanamide at a mass ratio of 1:0.32 (silica sol 15.625g), dry in vacuum at 40°C, and then bake at 550°C for 4 hours in a muffle furnace, then heat up At a rate of 2°C / min, the obtained product was washed with 4mol / L ammonium bifluoride solution to remove silica sol, washed with water by centrifugation, and dried to obtain mpg-C 3 N 4 ;

[0042] (2) Immerse 0.222g of cobalt nitrate hexahydrate solution in 1.455g of mpg-C 3 N 4 In the process, stir continuously at 80°C until the solution is evaporated to dryness, and then bake the second time in a muffle furnace at 300°C for 2 hours with a heating rate of 2°C / min to obtain 3%Co / mpg-C 3 N 4 .

[0043] (3) 3%Co / mpg-C will be obtained 3 N 4 Mix the catalyst and methylene blue solution in the photocatalytic reactor, the initial concentration of methylene blue is 80mg / L, the amount of catalyst added is 0.4g / L, the solution temperature is controlled at 15°C, after stirring for 30min, 500W xenon...

Embodiment 2

[0048] (1) Mix silica sol HS-40 and cyanamide at a mass ratio of 1:0.8 (silica sol 6.25g), dry it in vacuum at 70°C, then bake at 600°C for 6 hours in a muffle furnace, then heat up At a rate of 2°C / min, the obtained product was washed with 4mol / L ammonium bifluoride solution to remove silica sol, washed with water by centrifugation, and dried to obtain mpg-C 3 N 4 ;

[0049] (2) Immerse 0.222g of cobalt nitrate hexahydrate solution in 1.455g of mpg-C 3 N 4 In the process, stir continuously at 50°C until the solution is evaporated to dryness, and then bake the second time in a muffle furnace at 300°C for 2h, with a heating rate of 2°C / min, to obtain 3%Co / mpg-C 3 N 4 .

[0050] (3) Mix the obtained methylene blue solution in a photocatalytic reactor, the initial concentration of methylene blue is 25mg / L, and the catalyst is 3%Co / mpg-C 3 N 4 The amount of the solution added was 0.4g / L, and the solution temperature was controlled at 15°C. After stirring for 30 minutes, it ...

Embodiment 3

[0052] In Example 1, other conditions remain unchanged, and the mass ratio of silica sol HS-40 to cyanamide in step (1) of Example 1 is changed to 1:0.4 (silica sol 12.5g), so as to obtain 3%Co / mpg- C 3 N 4 It is catalyst, and its visible light catalytic reaction condition is identical with embodiment 2. After 180 min of photocatalytic reaction, the removal rate of methylene blue was 80.28%.

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Abstract

The invention discloses a preparation method of cobalt-loaded mesoporous graphite-phase carbon nitride (Co / mpg-C3N4) and an application of cobalt-loaded mesoporous graphite-phase carbon nitride (Co / mpg-C3N4) in visible-light-induced catalytic degradation of methylene blue. The catalyst is prepared by steeping a cobalt precursor and roasting at high temperature. The preparation method comprises the following steps of: (1) roasting at high temperature by using silica solution (Ludox, HS-40, 12nm, 40wt%SiO2) as a template and cyanamide as a carbon source and a nitrogen source, and removing the template to prepare mesoporous graphite-phase carbon nitride (mpg-C3N4); and (2) steeping the precursor solution of cobalt into mpg-C3N4, carrying out secondary high-temperature roasting in a muffle furnace to prepare the load-type catalyst Co / mpg-C3N4. By using the cobalt-carried mesoporous graphite-phase carbon nitride as the visible-light-induced catalyst, the result shows that the effect of the cobalt-carried mesoporous graphite-phase carbon nitride used for the visible-light-induced catalytic degradation of methylene blue is good, and the visible-light-induced catalytic degradation rate is obviously improved in comparison with the mesoporous graphite-phase carbon nitride (mpg-C3N4) without cobalt.

Description

technical field [0001] The invention belongs to the field of visible light catalysis, in particular to the preparation of a cobalt-loaded mesoporous graphite phase carbon nitride visible light catalyst and its application in visible light catalytic degradation of methylene blue. Background technique [0002] The two major challenges facing the sustainable development of mankind in the 21st century are environmental issues and energy issues. Solar energy has the advantages of being cheap, clean, and renewable. Therefore, it is the goal of people to use, convert, and store solar energy efficiently and quickly. Semiconductor photocatalysis technology is centered on the chemical conversion and storage of solar energy. It eliminates toxic organic pollutants through solar photocatalytic degradation and provides us with a green and environmentally friendly living space. Therefore, visible light catalysis technology will become one of the important means to deal with challenges. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24A62D3/17A62D101/26
Inventor 江芳陈晶妮陈欢汪信仇鹏翔
Owner NANJING UNIV OF SCI & TECH
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