Visible-light catalytic film with dual oxygen-assisted catalytic layers and preparation method and application thereof

A double oxygen-promoting catalytic layer and visible light technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of poor stability, inconvenient recycling, and catalytic efficiency Low cost, high repeatability, good catalytic activity and stability

Inactive Publication Date: 2016-06-08
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a visible light catalytic film with a double oxygen-promoting catalytic layer and its preparation method and application, which solves the technical problems of low catalytic efficiency, poor stability and inconvenient recycling of existing photocatalytic materials

Method used

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  • Visible-light catalytic film with dual oxygen-assisted catalytic layers and preparation method and application thereof
  • Visible-light catalytic film with dual oxygen-assisted catalytic layers and preparation method and application thereof
  • Visible-light catalytic film with dual oxygen-assisted catalytic layers and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The visible light catalytic thin film material (Fe 2 o 3 -FeOOH-NiOOH) preparation method comprises the steps:

[0045] (1) to contain Fe 2+ The precursor solution was used as the electrolyte, and a CHI660E electrochemical workstation was used to conduct electrodeposition using a three-electrode system, that is, clean conductive glass (FTO, commercially available) was used as the working electrode, the graphite electrode was used as the counter electrode, and the Ag / AgCl electrode was used as the reference electrode. After the electrode is dried naturally, it is calcined at a constant temperature to obtain Fe 2 o 3 film;

[0046] Containing Fe in this implementation case 2+ The precursor solution of Fe 2+ The molar concentration is 0.02M. Prepared by the following method:

[0047] Weigh a certain amount of FeCl 2 4H 2 O is dissolved in a certain volume of ethylene glycol and distilled water, and the volume ratio of ethylene glycol to distilled water is 1:8.

...

Embodiment 2

[0061] The visible light catalytic thin film material (Fe 2 o 3 The application of -FeOOH-NiOOH) comprises the following steps:

[0062] (1) Use 1MH 2 SO 4 solution or 1M NaOH solution to adjust the pH value of artificial simulated wastewater to 3;

[0063] The artificial simulated wastewater in this embodiment is artificial simulated wastewater containing phenol, and its concentration is 10 mg / L.

[0064] (2) Build a photoelectric catalytic degradation system, with the catalytic material prepared by embodiment 1 as the photoanode, and the titanium sheet as the cathode, and process the artificial simulated wastewater after adjusting the pH;

[0065] During the photocatalysis, electrocatalysis and photoelectrocatalysis degradation in this embodiment, in order to ensure the uniform concentration of pollutants, it is stirred in the whole process; at the same time, when performing electrocatalysis and photoelectrocatalysis Apply a working voltage of 3V between;

[0066] In o...

Embodiment 3

[0071] Repeat the operation steps of Example 1, the difference is that the visible light catalytic thin film material (Fe 2 o 3 -FeOOH-NiOOH) in the process, step (2) is not implemented, that is, steps (1) and (3) are implemented to prepare Fe 2 o 3 –NiOOH catalytic film.

[0072] Fe prepared under the conditions of this embodiment case 2 o 3 -NiOOH catalytic film and the Fe prepared by the conditions of Example 1 2 o 3 -FeOOH-NiOOH, Fe 2 o 3 -FeOOH and Fe 2 o 3 Catalyzed thin films, further comparison of photoelectrochemical properties.

[0073] The Fe obtained in this implementation case 2 o 3 -NiOOH catalytic thin film photoelectrochemical performance is better than Fe prepared by embodiment 1 2 o 3 Thin film, but slightly inferior to Fe 2 o 3 -FeOOH catalytic film, and significantly inferior to Fe 2 o 3 -FeOOH-NiOOH catalytic thin film. Under visible light irradiation, when the voltage is 0.35Vvs.Ag / AgCl, Fe 2 o 3 -NiOOH to Fe 2 o 3 The photocurrent ...

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Abstract

The invention discloses a visible-light catalytic film with dual oxygen-assisted catalytic layers and a preparation method and application thereof. The preparation method comprises the steps: (1) carrying out codeposition by adopting a three-electrode system in a manner of taking conductive glass as a working electrode, and then, carrying out constant-temperature calcination, so as to obtain a Fe2O3 film; (2) carrying out codeposition by adopting the three-electrode system in a manner of taking the Fe2O3 film as a working electrode, and then, carrying out natural air-drying, so as to obtain a Fe2O3-FeOOH catalytic film; (3) carrying out codeposition by adopting the three-electrode system in a manner of taking the Fe2O3-FeOOH catalytic film as a working electrode, and then, carrying out natural air-drying, thereby obtaining the catalytic film with the dual oxygen-assisted catalytic layers. The catalytic film disclosed by the invention is used for treating phenolic wastewater; two kinds of oxygen-assisted catalysts, i.e., FeOOH and NiOOH are built in the Fe2O3 film by a cyclic volt-ampere deposition method, so that the photoelectrocatalytic oxygen yielding performance and photocatalytic stability of the Fe2O3 film are greatly improved.

Description

technical field [0001] The invention relates to the technical field of photoelectric catalytic materials, in particular to a highly stable visible light catalytic film material (Fe 2 o 3 -FeOOH-NiOOH) and its application. Background technique [0002] Environmental pollution and energy shortage are two severe challenges facing mankind today. Photocatalytic oxidation has attracted much attention due to its high efficiency, environmental friendliness, and low energy consumption. The key to this technology lies in the preparation of highly efficient and stable catalysts. [0003] Iron oxide is a transition metal oxide, which shows certain advantages in the field of photoelectrocatalysis. Its bandgap width is narrow, and it shows strong photoelectrochemical response in the ultraviolet and visible regions. At the same time, it also has It has the advantages of good physical and chemical stability, low economic cost and no harm to the environment. However, its photogenerated ...

Claims

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Application Information

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IPC IPC(8): B01J23/755C02F1/30C02F1/461C02F101/34
CPCC02F1/30C02F1/46109B01J23/755B01J37/348C02F2305/10C02F2101/345C02F2001/46133B01J35/33B01J35/39
Inventor 丛燕青姬云王娟葛耀花张轶王齐
Owner ZHEJIANG GONGSHANG UNIVERSITY
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