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A visible light responsive cual 2 o 4 - Preparation and application of graphene photocatalyst

A cual2o4-, photocatalyst technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, preparation of organic compounds, physical/chemical process catalyst, etc., can solve the problem of limited photocatalytic activity, low photocatalytic efficiency, Reduce the specific surface area and other issues to achieve the effect of improving photocatalytic activity, cheap reagents, and reducing recombination

Inactive Publication Date: 2016-08-17
HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to single CuAl 2 o 4 The photocatalytic efficiency is relatively low, and at the same time, it is easy to agglomerate during the preparation process, which reduces the specific surface area and limits the improvement of photocatalytic activity.

Method used

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  • A visible light responsive cual <sub>2</sub> o <sub>4</sub> - Preparation and application of graphene photocatalyst
  • A visible light responsive cual <sub>2</sub> o <sub>4</sub> - Preparation and application of graphene photocatalyst
  • A visible light responsive cual <sub>2</sub> o <sub>4</sub> - Preparation and application of graphene photocatalyst

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Experimental program
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preparation example Construction

[0020] The present invention responds to a kind of visible light CuAl 2 o 4 -The preparation method of graphene photocatalyst, comprises the following steps:

[0021] (1) Weigh a certain amount of copper nitrate and aluminum nitrate and dissolve them in deionized water, add polyethylene glycol (PEG-4000) as a dispersant, adjust the pH of the solution with 25% ammonia water, stir, and let stand.

[0022] (2) Prepare graphite oxide from graphite powder.

[0023] (3) with CuAl 2 o 4 To measure the quality of graphite oxide, different proportions of graphite oxide were ultrasonically dispersed in reducing alcohol.

[0024] (4) After mixing the reaction system in step (1) with the suspension prepared in step (3), transfer it to a hydrothermal reaction kettle for hydrothermal reaction.

[0025] (5) Pour the product in step (4) into a vacuum filtration device for suction filtration, wash with deionized water, vacuum dry, grind and roast to obtain nano-CuAl 2 o 4 - Graphene pho...

Embodiment 1

[0035] CuAl prepared under optimal conditions with 1% graphite oxide 2 o 4 - Graphene photocatalyst, when the amount of photocatalyst is 0.5g / L, the degradation rate of methyl orange with a concentration of 25mg / L is 85.26% after 60min, continuous hydrogen production is 6h, and the average hydrogen production rate is 3.1mmol / gcat·h. Under the same conditions, the degradation rate of the control experiment in the dark is less than 5%, and there is no hydrogen production effect. The blank experiment without catalyst has almost no degradation and hydrogen production effect after 60 minutes of light irradiation.

[0036] Preparation method embodiment 2

[0037] CuAl prepared under optimum conditions with an amount of 2% graphite oxide 2 o 4 - Graphene photocatalyst, when the amount of photocatalyst is 0.8g / L, the degradation rate of methyl orange with a concentration of 25mg / L reaches 98.25% after 60min, continuous hydrogen production for 6h, and the average hydrogen productio...

Embodiment 3

[0039] CuAl prepared under optimal conditions with an amount of 3% graphite oxide 2 o 4 - Graphene photocatalyst, when the concentration is 1.0g / L, the degradation rate of methyl orange with a concentration of 25mg / L is 95.52% after 60min, continuous hydrogen production for 6h, and the average hydrogen production rate is 4.7mmol / gcat·h. Under the same conditions, the degradation rate of the control experiment in the dark is less than 7%, and there is no hydrogen production effect. There is almost no degradation and hydrogen production effect in the blank experiment without catalyst after 60 minutes of light irradiation.

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Abstract

The invention discloses preparation and application of a visible light responding CuAl2O4-graphene photocatalyst, belonging to the technical field of new materials and preparation thereof. The method is characterized in that: copper nitrate, aluminum nitrate and graphite powder are used as raw materials, polyethylene glycol (PEG-4000) is used as a dispersant, and reduction of graphite oxide, preparation of CuAL2O4 and compounding of CuAl2O4 and graphene are finished by one step through a hydrothermal method. The preparation method is simple and convenient as well as environment-friendly; and the obtained photocatalyst is small in granules, wide in light response range and high in photocatalysis activity. Under optimum condition, when the use amount of the photocatalyst is 1.00 g / L, the degradation rate of 25 mg / L methyl orange within 60 min achieves 99.58%; and the average hydrogen producing rate under the optimal experiment condition is 5.2 mmol / gcat.h. In addition, the photocatalyst has high activity in the aspects of alcohol preparation by CO2 photocatalytic reduction, photocatalysis sterilizing, alga removal and the like.

Description

technical field [0001] The invention relates to a method and application of a one-time hydrothermal method for preparing a nano photocatalytic material responsive to visible light. The photocatalytic material is CuAl 2 o 4 Composite with graphene, it has good photocatalytic performance under visible light irradiation. technical background [0002] With the rapid development of the economy, the problems of energy shortage and environmental pollution have become increasingly prominent, and the application of photocatalytic technology as a green environmental protection technology has attracted widespread attention of scientists. The search for new high-efficiency photocatalytic materials is one of the key contents in the development and application of photocatalytic technology. Most of the photocatalytic materials currently studied have a large bandgap, and the photocatalytic reaction requires high energy excitation. The catalytic reaction activity under visible light is not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/72C02F1/30C01B3/04C07C29/154A01N59/20A01P1/00A01P13/00C02F101/38
CPCY02E60/36Y02P20/133Y02W10/37
Inventor 张丽阎建辉周民杰
Owner HUNAN INSTITUTE OF SCIENCE AND TECHNOLOGY