Ru-ZnO photocatalyst as well as preparation method and application thereof

A technology of photocatalyst and ruthenium chloride, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., which can solve the problems of low efficiency of photocatalytic degradation of methane, poor cycle stability of catalysts, and limitation of full utilization of solar energy, etc. problems, achieve high-efficiency catalytic performance and cycle stability, improve photocatalytic efficiency, good photocatalytic activity and cycle stability

Active Publication Date: 2020-08-18
HUBEI UNIV
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Problems solved by technology

[0004]Currently, the research on the activation of methane C-H and the oxidation of methane is mainly based on TiO2-based semiconductors and molecular sieves, mainly focusing on the study of high-concentration Photocatalytic conversion and photocatalytic oxidation of methane, there are few reports on photocatalytic oxidation of low concentration methane
Moreover, the band gap of TiO2 is 3.2eV, which can only absorb 5% of the ultraviolet light in sunlight, which limits the full use of solar energy and reduces the efficiency of photocatalytic degradation of methane.
And other catalysts such as: CeO2, Ga2O3, MoO3, V2O5, etc. cannot achieve photocatalytic oxidation of low-concentration methane at normal temperature and pressure
In addition, the catalysts for the activation of methane C-H and the oxidation of methane also have the problem of poor cycle stability.

Method used

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  • Ru-ZnO photocatalyst as well as preparation method and application thereof
  • Ru-ZnO photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0024] To achieve the above objectives, the present invention provides a method for preparing Ru-ZnO photocatalyst, which includes the following steps:

[0025] (1) Mixing zinc salt with oxalic acid and water, precipitation reaction to obtain zinc oxalate;

[0026] (2) subjecting the zinc oxalate obtained in the step (1) to the first annealing to obtain ZnO;

[0027] (3) Mixing the ZnO obtained in step (2) with ruthenium chloride and water to perform an oxidation-reduction reaction to obtain a precursor;

[0028] (4) The precursor obtained in the step (3) is subjected to a second annealing to obtain a Ru-ZnO photocatalyst.

[0029] In the present invention, zinc salt is mixed with oxalic acid and water, and zinc oxalate is obtained by precipitation reaction. In the present invention, the operation of mixing the zinc salt with oxalic acid and water is not particularly limited, and a mixing technical solution well known to those skilled in the art may be used. In the present invention, ...

Embodiment 1

[0053] Add 10g of zinc acetate dihydrate to 100mL of deionized water, stir until completely dissolved, add 20g of oxalic acid dihydrate to the above solution under stirring conditions (wherein the weight ratio of zinc acetate dihydrate to oxalic acid dihydrate is 1:2 , Stirred for 30 minutes to obtain zinc oxalate precipitate. Then the zinc oxalate precipitate was filtered with suction and washed with sufficient water, and the zinc oxalate was dried at 100°C for 5h. Zinc oxalate was ground into powder and placed in the air at 350°C Anneal for 6h to obtain ZnO powder.

[0054] Disperse 1 g of the above ZnO powder in 75 mL of deionized water ultrasonically, and stir until a uniformly dispersed suspension is formed. Then, the prepared ruthenium chloride solution (0.0964mol / L) was added, and the amount of ruthenium chloride added was 102.69 μL (the weight ratio of Ru element to ZnO in the added ruthenium chloride was 0.1:100). After adding the ruthenium chloride solution, stirring f...

Embodiment 2

[0056] The method of Example 1 was used to prepare ZnO.

[0057] Disperse 1 g of the above ZnO powder in 75 mL of deionized water ultrasonically, and stir until a uniformly dispersed suspension is formed. Then the prepared ruthenium chloride solution (0.0964mol / L) was added, and the amount of ruthenium chloride added was 51.34 μL (the weight ratio of Ru element to ZnO in the added ruthenium chloride was 0.05:100). After adding the ruthenium chloride solution, stirring for 3 hours, and then standing for 1 hour, the resulting precipitate was suction filtered and dried at 60° C. for 10 hours. Grind the dried product into powder, and anneal it in air at 200°C for 30 minutes to obtain 0.05-Ru-ZnO.

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Abstract

The invention provides a Ru-ZnO photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of photocatalysts. The preparation method of the Ru-ZnO photocatalyst provided by the invention comprises the following steps: mixing zinc salt with oxalic acid and water, and carrying out precipitation reaction to obtain zinc oxalate; carrying out first annealing on the zinc oxalate to obtain ZnO; mixing the ZnO with ruthenium chloride and water, and carrying out oxidation-reduction reaction to obtain a precursor; and carrying out second annealing on the precursor to obtain the Ru-ZnO photocatalyst. The Ru-ZnO photocatalyst obtained by the preparation method provided by the invention can efficiently catalyze and degrade methane under simulated sunlight,and shows excellent performance of photo-catalytically purifying low-concentration methane in air at normal temperature and normal pressure; the 0.1-Ru-ZnO photocatalyst shows quite good cycling stability in ten times of cyclic degradation tests.

Description

Technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a Ru-ZnO photocatalyst and a preparation method and application thereof. Background technique [0002] Methane is a colorless and odorless gas at room temperature and pressure, and is a typical non-polar molecule. The C-H bond energy in methane is as high as 434KJ / mol, so methane is very stable at room temperature, difficult to adsorb, and difficult to activate and degrade. The traditional method of degrading methane usually uses noble metal catalysts to achieve the catalytic oxidation of methane under high temperature conditions. Although this method is efficient, the cost of noble metals is too high, and this method of high-temperature degradation of methane needs to be carried out at a temperature above 800°C. Under such conditions, the noble metal nanocatalysts tend to accumulate and grow, leading to catalyst deactivation; However, noble metal catalysts can easily catalyz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B01J37/03B01D53/86B01D53/72
CPCB01J23/60B01J35/004B01J37/031B01D53/007B01D53/864B01D2257/7025B01D2258/06B01D2259/802Y02C20/20
Inventor 陈绪兴苏扬航高云李荣徐欣悦胡欣欣
Owner HUBEI UNIV
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