Preparation method of photocatalyst Pt-ZnGa2O4 efficient in CO2 reduction under sunlight drive

A photocatalyst and nanophotocatalyst technology, applied in catalyst activation/preparation, preparation of organic compounds, preparation of hydroxyl compounds, etc., can solve the problems of limiting photocatalytic activity, low photocatalytic efficiency, reducing specific surface area, etc. Quantum efficiency, simple preparation process, uniform particle effect

Inactive Publication Date: 2016-06-01
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

Due to single ZnGa 2 o 4 The photocatalytic efficiency is relatively low. If the sample is prepared by high-temperature solid-phase method, it is easy to agglomerate, which reduces the specific surface area and limits the improvement of photocatalytic activity.

Method used

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  • Preparation method of photocatalyst Pt-ZnGa2O4 efficient in CO2 reduction under sunlight drive
  • Preparation method of photocatalyst Pt-ZnGa2O4 efficient in CO2 reduction under sunlight drive
  • Preparation method of photocatalyst Pt-ZnGa2O4 efficient in CO2 reduction under sunlight drive

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Experimental program
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Effect test

preparation Embodiment 1

[0026] Weigh zinc nitrate and gallium nitrate with a molar ratio of Zn to Ga of 1:2 and dissolve them in deionized water under magnetic stirring to form a mixed solution. The ZnGa obtained by PEG-400 according to the reaction theory 2 o 4 Add 3% of the mass of the mixed nitrate solution into the mixed nitrate solution. After it is completely dissolved, add 20% ammonia water drop by drop under magnetic stirring to adjust the pH value of the solution to 8; transfer the mixed solution to a hydrothermal reaction kettle for hydrothermal 1. Aging reaction, the reaction temperature is 80°C, and the reaction time is 12 hours; the reaction product is poured into a vacuum filtration device for suction filtration, washed with deionized water, and vacuum-dried at 500°C for 3 hours to obtain nano-ZnGa with high specific surface area. 2 o 4 ; Take the obtained ZnGa 2 o 4 The product is dispersed in deionized water, fully stirred to form a suspension, and 2% H of its Pt load weight is add...

preparation Embodiment 2

[0028] Weigh zinc nitrate and gallium nitrate with a molar ratio of Zn to Ga of 1:2 and dissolve them in deionized water under magnetic stirring to form a mixed solution. The ZnGa obtained by PEG-4000 according to the reaction theory 2 o 4 Add 4% of the quality of the mixed nitrate solution into the mixed nitrate solution. After it is completely dissolved, add 20% ammonia water drop by drop under magnetic stirring to adjust the pH value of the solution to 9; transfer the mixed solution to a hydrothermal reaction kettle for hydrothermal 1. Aging reaction, the reaction temperature is 100°C, and the reaction time is 10 hours; the reaction product is poured into a vacuum filtration device for suction filtration, washed with deionized water, and vacuum-dried at 400°C for 4 hours to obtain nano-ZnGa with high specific surface area. 2 o 4 ; Take the obtained ZnGa 2 o 4 The product is dispersed in deionized water, ultrasonically dispersed and fully stirred to form a suspension, and...

preparation Embodiment 3

[0030] Weigh zinc nitrate and gallium nitrate with a molar ratio of Zn to Ga of 1:2 and dissolve them in deionized water under magnetic stirring to form a mixed solution. The ZnGa obtained by PEG-10000 according to the reaction theory 2 o 4 Add 6% of the mass of the mixed nitrate solution into the mixed nitrate solution. After it is completely dissolved, add 20% ammonia water drop by drop under magnetic stirring to adjust the pH value of the solution to 10; transfer the mixed solution to a hydrothermal reaction kettle for hydrothermal 1. Aging reaction, the reaction temperature is 120°C, and the reaction time is 8 hours; the reaction product is poured into a vacuum filtration device for suction filtration, washed with deionized water, and vacuum-dried at 300°C for 6 hours to obtain nano-ZnGa with a high specific surface 2 o 4 . Weigh a certain amount of ZnGa 2 o 4 Put it into a beaker, add 5mL absolute ethanol and sonicate for 10 minutes, then add H 2 PtCl 6 Aqueous solu...

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Abstract

The invention discloses a preparation method of a photocatalyst Pt-ZnGa2O4 efficient in CO2 reduction under sunlight drive. The method includes: (1) dissolving zinc nitrate and gallium nitrate into deionized water to form a mixed solution, wherein a ratio of the zinc nitrate to the gallium nitrate is 1:2; (2) adding polyethylene glycol into the mixed solution, and adding 20% ammonia water dropwise to regulate a pH value of the solution to be weakly alkaline; (3) transferring a reaction system to a reaction kettle to realize hydrothermal and aging reactions; (4) subjecting reaction products to leaching, washing, drying and calcining to obtain ZnGa2O4 high in specific surface area; (5) dispersing the ZnGa2O4 into deionized water, and adding chloroplatinic acid to realize reduction deposition of Pt4+ onto the surface of the ZnGa2O4; (6) centrifugally separating the products, washing with deionized water, and drying to obtain the Pt-ZnGa2O4. By the preparation method, uniform particles, simplicity, energy saving, environment friendliness and stability are realized, and the photocatalyst Pt-ZnGa2O4 is efficient in CO2 reduction under sunlight irradiation.

Description

technical field [0001] The invention relates to a kind of high specific surface ZnGa prepared by low-temperature hydrothermal method and aging under the action of dispersant 2 o 4 , and then prepare Pt-ZnGa by impregnation-reduction method 2 o 4 A method for photocatalytic nanomaterials that have good CO 2 Photocatalytic reduction performance. Background technique [0002] With the continuous development of human society and the continuous expansion of population, energy crisis and environmental problems are two severe challenges that human beings must face in the 21st century. 80% of the world's energy consumption still comes from fossil energy such as oil, coal, and natural gas. From the perspective of economy, environment, and society, this energy supply and consumption trend is obviously unsustainable. With the continuous development of industry, the reduction of the number of forests, the significant increase of carbon emissions has broken the balance of carbon cyc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J37/16C07C29/159C07C31/04
CPCY02P20/52B01J23/002B01J23/62B01J35/004B01J35/1019B01J37/16B01J2523/00C07C29/159B01J2523/27B01J2523/32B01J2523/828C07C31/04
Inventor 张丽戴超华阎建辉张秀秀周民杰钟明
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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