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Preparation method for Pt@CeO2/3DCN composite photocatalyst applied to photocatalytic reduction of CO2

A composite light and catalyst technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high electron-hole recombination rate, unfavorable agglomeration and full contact, etc., and achieve the effect of easy operation

Inactive Publication Date: 2019-09-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to CeO 2 Small particle size, easy to agglomerate and not conducive to full contact with CO 2 , the disadvantages of high electron-hole recombination rate under ultraviolet light, so it is necessary to treat CeO 2 modify

Method used

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  • Preparation method for Pt@CeO2/3DCN composite photocatalyst applied to photocatalytic reduction of CO2
  • Preparation method for Pt@CeO2/3DCN composite photocatalyst applied to photocatalytic reduction of CO2
  • Preparation method for Pt@CeO2/3DCN composite photocatalyst applied to photocatalytic reduction of CO2

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation of three-dimensional porous carbon nitride (3DCN):

[0033] Put melamine into a crucible with a cover, then place the crucible in a muffle furnace at 500°C for calcination for 2 hours, and collect g-C in block form after cooling down. 3 N 4 ; then 2g block g-C 3 N 4 With 2g ammonium bicarbonate (NH 4 HCO 3 ) were ground and mixed, and put into a tube furnace for calcination at 200° C. for 2 h. After cooling down, the obtained sample was washed and dried to obtain three-dimensional porous carbon nitride (3DCN).

[0034] (2)CeO 2 / 3DCN composite photocatalyst preparation:

[0035] Weigh 0.19g of cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) and 0.5g of 3DCN dispersed in deionized water, stirred at room temperature, transferred to an oven for drying after stirring, and put the dried sample into a muffle furnace for calcination at 300°C for 2h to obtain CeO 2 / 3DCN composite photocatalyst.

[0036] (3) Pt@CeO 2 / 3DCN composite photocatalyst pr...

Embodiment 2

[0040] (1) Preparation of three-dimensional porous carbon nitride (3DCN):

[0041] Put melamine into a crucible with a cover, then place the crucible in a muffle furnace at 550°C for calcination for 2 hours, and collect g-C in block form after cooling down. 3 N 4 ; then 2g block g-C 3 N 4 With 4g ammonium bicarbonate (NH 4 HCO 3 ) were ground and mixed, put into a tube furnace for calcination at 300° C. for 2 h, and after cooling down, the obtained sample was washed and dried to obtain three-dimensional porous carbon nitride (3DCN).

[0042] (2)CeO 2 / 3DCN composite photocatalyst preparation:

[0043] Weigh 0.38g of cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) and 0.5g of 3DCN dispersed in deionized water, stirred at room temperature, transferred to an oven for drying after stirring, and put the dried sample into a muffle furnace for calcination at 350°C for 2h to obtain CeO 2 / 3DCN composite photocatalyst.

[0044] (3) Pt@CeO 2 / 3DCN composite photocatalyst pr...

Embodiment 3

[0048] (1) Preparation of three-dimensional porous carbon nitride (3DCN):

[0049] Put melamine into a crucible with a cover, and then place the crucible in a muffle furnace at 600°C for calcination for 2 hours. After cooling down, collect g-C 3 N 4 ; then 2g block g-C 3 N 4 With 6g ammonium bicarbonate (NH 4 HCO 3 ) were ground and mixed, put into a tube furnace for calcination at 350° C. for 2 h, and after cooling down, the obtained sample was washed and dried to obtain three-dimensional porous carbon nitride (3DCN).

[0050] (2)CeO 2 / 3DCN composite photocatalyst preparation:

[0051] Weigh 0.57g of cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) and 0.5g of 3DCN dispersed in deionized water, stirred at room temperature, transferred to an oven for drying after stirring, and put the dried sample into a muffle furnace for calcination at 400°C for 2h to obtain CeO 2 / 3DCN composite photocatalyst.

[0052] (3) Pt@CeO 2 / 3DCN composite photocatalyst preparation:

...

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Abstract

The invention provides a preparation method and application of a Pt@CeO2 / 3DCN composite photocatalyst, belonging to the technical field of preparation of energy conversion materials. The preparation method mainly includes the following three steps: firstly, preparing three-dimensional porous carbon nitride (3D CN); secondly, mixing cerium nitrate hexahydrate with 3D CN under stirring, and carrying out drying and calcining to obtain a CeO2 / 3DCN binary composite photocatalyst; and dispersing a certain amount of the CeO2 / 3DCN photocatalyst in an isopropanol solution, introducing nitrogen to remove gas in the solution, then adding a chloroplatinic acid solution drop by drop, carrying out stirring under the irradiation of an ultraviolet lamp, and after a reaction is completed, performing filtering, washing and vacuum drying so as to obtain the Pt@CeO2 / 3DCN ternary composite photocatalyst. The obtained Pt@CeO2 / 3DCN ternary composite photocatalyst is used for reducing CO2 under the irradiation of ultraviolet light. The preparation method of the invention is simple, and does not cause the waste of resources and the formation of secondary pollution; and the composite photocatalyst is an environment-friendly efficient energy conversion technology.

Description

technical field [0001] The invention belongs to the technical field of preparation of energy conversion materials, and relates to a method for reducing CO 2 Pt@CeO 2 Preparation method and application of / 3DCN composite photocatalyst. Background technique [0002] In today's society, with the rapid development of modern industrial level, the abundant energy resources in nature are continuously exploited and consumed, resulting in the gradual reduction or even exhaustion of energy resources. Energy shortage and climate change are major problems facing society today and need to be solved urgently. The increasing consumption of traditional fossil fuels has not only brought about an energy crisis, but also the CO released during their combustion 2 Greenhouse gases have a huge impact on the ecological balance of nature. CO 2 The increase of greenhouse gases will not only have a huge impact on human life, but also cause great damage to nature. For example, CO 2 The increase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10B01J37/08C01B32/40C07C1/12C07C9/04
CPCB01J27/24B01J37/082C01B32/40C07C1/12C07C9/04B01J35/39B01J35/61Y02P20/10
Inventor 王会琴关静茹霍鹏伟吴东遥尹世康李金择
Owner JIANGSU UNIV
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