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Preparation method for two-dimensional rGO/R-CeO2/CNNS hierarchical-structure composite photocatalyst

A hierarchical structure, r-ceo2 technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low light absorption efficiency, insufficient photocatalyst stability, poor selectivity, etc.

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

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Problems solved by technology

[0003] However, photocatalytic CO 2 Reduction still has the following problems: the photocatalyst is not stable enough, the light absorption efficiency is low, the photogenerated electron-hole recombination is easy, and the selectivity is poor.
These problems are hindering CO 2 Top Reasons for Recycling

Method used

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  • Preparation method for two-dimensional rGO/R-CeO2/CNNS hierarchical-structure composite photocatalyst
  • Preparation method for two-dimensional rGO/R-CeO2/CNNS hierarchical-structure composite photocatalyst
  • Preparation method for two-dimensional rGO/R-CeO2/CNNS hierarchical-structure composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Preparation of GO:

[0039] Put the three-necked flask in the ice-water bath, add 1g of graphite powder and 2.5g of sodium nitrate, then add 30mL of concentrated sulfuric acid, stir and mix evenly; Continue magnetic stirring for 2 hours under the condition of an ice-water bath; then raise the temperature to 35°C, and after stirring at this temperature for 30 minutes, slowly add 40 mL of deionized water into the three-necked flask; then raise the temperature to 98°C, and react at this temperature for 40 minutes , the stirring continued, and the heating was turned off; when the temperature of the water bath dropped to 70°C, 10 mL volume fraction of 30% hydrogen peroxide (H 2 o 2 ) into a three-necked flask, and after cooling down to room temperature, transfer the mixed solution in the three-necked flask to a beaker, and wash three times with 5% HCl solution to remove impurity ions, and finally wash the pH of GO with deionized water until pH The value is about 6, freez...

Embodiment 2

[0049] (1) Preparation of GO:

[0050] Implementation according to step (1) in Example 1.

[0051] (2)g-C 3 N 4 Nanosheets (CNNS) and Rod CeO 2 (R-CeO 2 )preparation:

[0052] Put 5g of cyanuric acid into a crucible with a cover, and then put the crucible in a muffle furnace at 550°C for calcination for 2 hours. After cooling down to room temperature, collect a light yellow sample to obtain g-C 3 N 4 Flake (CNNS);

[0053] Take by weighing 1.7364g cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) and 14.7g of NaOH were dissolved in 70mL of deionized water, ultrasonically treated, then transferred to a 100mL polytetrafluoroethylene-lined stainless steel reactor, and the reactor was placed in an oven at 110°C for 24 hours, and the reaction was taken out after the reaction was completed. The kettle was naturally cooled to room temperature, then washed several times with deionized water and ethanol, and dried to obtain rod-like CeO 2 (R-CeO 2 ).

[0054] (3) R-CeO 2 P...

Embodiment 3

[0060] (1) Preparation of GO:

[0061] Implementation according to step (1) in Example 1.

[0062] (2)g-C 3 N 4 Nanosheets (CNNS) and Rod CeO 2 (R-CeO 2 )preparation:

[0063] Put 5g of cyanuric acid into a crucible with a cover, and then put the crucible in a muffle furnace at 600°C for calcination for 2 hours. After cooling down to room temperature, collect a light yellow sample to obtain g-C 3 N 4 Flake (CNNS);

[0064] Take by weighing 1.7364g cerium nitrate hexahydrate (Ce(NO 3 ) 3 ·6H 2 O) and 19.6g of NaOH were dissolved in 70mL of deionized water, ultrasonically treated, and then transferred to a 100mL polytetrafluoroethylene-lined stainless steel reactor, and the reactor was placed in a 120°C oven for 24 hours, and the reaction was taken out after the reaction was completed. The kettle was naturally cooled to room temperature, then washed several times with deionized water and ethanol, and dried to obtain rod-like CeO 2 (R-CeO 2 ).

[0065] (3) R-CeO 2 P...

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Abstract

The invention discloses a preparation method for a two-dimensional rGO / R-CeO2 / CNNS hierarchical-structure composite photocatalyst used for reducing CO2, belonging to the technical field of preparation of energy conversion materials. The preparation method of the invention includes the following steps: (1) preparation of graphene oxide (GO) by using an improved Hummers process; (2) preparation of CNNS and rod-like CeO2 CNNS by calcining cyanuric acid in a muffle furnace, wherein Ce(NO3)3.6H2O and NaOH are used as raw materials, and a hydrothermal method is employed for preparation of the rod-like CeO2 (R-CeO2); (3) preparation of R-CeO2 / CNNS binary composite photocatalyst; and (4) preparation of the two-dimensional rGO / R-CeO2 / CNNS hierarchical-structure composite photocatalyst. The two-dimensional rGO / R-CeO2 / CNNS hierarchical-structure composite photocatalyst obtained by using the multi-step method is used for reducing CO2 under ultraviolet light. The preparation method of the invention is simple, does not cause waste of resources and formation of secondary pollution, and provides a technology to alleviate energy crisis.

Description

technical field [0001] The invention belongs to the technical field of preparation of energy conversion materials, and relates to a two-dimensional rGO / R-CeO 2 / CNNS hierarchical structure composite photocatalyst preparation method and its application. Background technique [0002] Global carbon dioxide (CO 2 ) emissions have attracted widespread attention, CO 2 The resulting greenhouse effect leads to serious climate and environmental problems, however CO 2 It is also a potential carbon resource, and more and more researchers are actively developing and utilizing it. As technology advances, more and more methods are used for CO 2 Energy conversion, such as electrocatalysis, photocatalysis, photoelectric catalysis, biological conversion and other methods, convert CO 2 Gas synthesis of chemical products has created new conditions and possibilities. Currently, an ideal solution to CO 2 The solution to the problem is to use solar energy to reduce CO under the action of p...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J37/10B01J37/08B01J35/10C01B32/40C07C1/12C07C9/04
CPCB01J27/24B01J37/10B01J37/082C01B32/40C07C1/12B01J35/39B01J35/61C07C9/04
Inventor 关静茹王会琴李金择李鑫霍鹏伟
Owner JIANGSU UNIV
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