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MoS2-doped iron oxide photocatalytic thin film and preparation method as well as application thereof to treatment of phenolic waste water

An iron oxide light and thin film technology, applied in catalyst activation/preparation, chemical instruments and methods, special compound water treatment, etc. problem, to achieve good photoelectric catalytic activity, high separation efficiency of photogenerated electrons and holes, and good stability.

Inactive Publication Date: 2016-05-25
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses electrodeposition and drop coating to dope Ta / Al onto the iron oxide photocatalytic film, which can increase the photocurrent and photocatalytic activity to a certain extent, but the improvement effect is limited; and the surface of the prepared photocatalytic film is comparatively Rough, active ingredients are easy to peel off; Ta / Al-Fe 2 o 3 The effective area of ​​the photocatalytic film is difficult to control

Method used

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  • MoS2-doped iron oxide photocatalytic thin film and preparation method as well as application thereof to treatment of phenolic waste water
  • MoS2-doped iron oxide photocatalytic thin film and preparation method as well as application thereof to treatment of phenolic waste water
  • MoS2-doped iron oxide photocatalytic thin film and preparation method as well as application thereof to treatment of phenolic waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) with Fe 2+ precursor solution (Fe 2+ Derived from FeCl 2 ) as the electrolyte, the conductive substrate after cleaning and drying as the working electrode, the graphite electrode as the counter electrode, and the Ag / AgCl electrode as the reference electrode for electrodeposition.

[0053] The conductive substrate in this example is FTO glass (10 mm x 50 mm x 2 mm). Before preparing the film, it was ultrasonically cleaned with acetone, absolute ethanol and deionized water for 10 min, and then taken out to dry.

[0054] The thickness of the film obtained by electrodeposition is controlled by electrodeposition process parameters. In this embodiment, the electrodeposition process parameters are as follows: electrodeposition temperature is 70° C., working voltage is 1.36 V, and deposition time is 5 minutes.

[0055] (2) Then put the conductive substrate deposited in step (1) into a muffle furnace and calcinate at 500°C for 2 hours to obtain Fe 2 o 3 Photocatalytic th...

Embodiment 2

[0068] The wastewater to be treated in this embodiment is phenol wastewater, wherein the initial concentration of phenol is 10 mg / L.

[0069] The MoS-based 2 The wastewater treatment method of the doped iron oxide photocatalytic film, the treatment process is as follows:

[0070] The pH of the solution before the reaction was measured, that is, the pH of the unadjusted phenol solution was about 6, and photocatalytic degradation was carried out. The photocatalytic anode used in photocatalytic treatment includes a conductive substrate and MoS coated on the surface of the conductive substrate. 2 Doped iron oxide photocatalytic film (made by embodiment 1), the cathode is a titanium sheet.

[0071] In the photocatalytic treatment in this embodiment, before the working voltage is applied to the photocatalytic electrode pair, the treated wastewater is also subjected to dark adsorption treatment, and the dark adsorption treatment time is 30 minutes.

[0072] During the photocatalyt...

Embodiment 3

[0078] Repeat the operating steps of Examples 1 and 2, the difference is to prepare MoS 2 In the process of doping the iron oxide photocatalytic film, the Fe in step (1) 2+ Fe in the precursor solution 2+ The source is ferrous acetate.

[0079] Fe prepared under the conditions of this example 2 o 3 -MoS 2 Thin film photoelectrochemical performance is worse than the Fe prepared under the conditions of Example 1 2 o 3 -MoS 2 film, under visible light, compared to Fe 2 o 3 Thin film (with comparative example 1), the Fe of the present embodiment 2 o 3 -MoS 2 The photocurrent (ie, current density) of the thin film is correspondingly increased by 23 times; under the ultraviolet-visible light, the photocurrent (ie, current density) is correspondingly increased by 20 times. The degradation rate of phenol under visible light conditions is 83.2%.

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Abstract

The invention discloses a preparation method of a MoS2-doped iron oxide photocatalytic thin film. The preparation method of the MoS2-doped iron oxide photocatalytic thin film comprises the following steps of (1), electrodepositing a precursor solution of Fe<2+> on a conducting substrate, and obtaining a Fe2O3 thin film through calcination treatment; (2), electrodepositing MoS2 on the Fe2O3 thin film prepared in the step (1), calcining the Fe2O3 thin film in an inert atmosphere to obtain a Fe2O3-MoS2 photocatalytic thin film. The invention also discloses the MoS2-doped iron oxide photocatalytic thin film prepared by adopting the above method and application to the treatment of phenolic waste water by utilizing the film. The preparation method provided by the invention is simple and low-cost. The photocatalytic thin film prepared by adopting an electrodeposition method is uniform in film formation and good in stability; an active component is difficult to peel off; the area of the thin film is easy to control. The separation efficiency of photoelectrons and holes of the prepared Fe2O3-MoS2 thin film is high; the prepared Fe2O3-MoS2 thin film has favorable photoelectrocatalytic activity. Through measurement, the photoelectric current of a prepared composite photocatalytic thin film is increased by approximately 25 times relative to that of the Fe2O3 thin film.

Description

technical field [0001] The invention relates to the technical field of photoelectric catalysis, in particular to a MoS 2 Doped iron oxide photocatalytic film, preparation method and application in treating phenolic wastewater. Background technique [0002] The supply of natural renewable energy such as solar and wind energy is not continuous, so effective storage methods are needed to balance the mismatch between energy production and consumption. As an ideal energy carrier, hydrogen has the advantages of cleanness, regeneration, high combustion value and easy transportation. Photoelectrocatalytic technology has shown great potential in dealing with various environmental problems and energy crises at present. The key technology lies in the preparation of highly efficient and stable photocatalytic films. [0003] Fe 2 o 3 As a visible light-responsive semiconductor material, its band gap energy is 2.1eV, and it has good photoresponse under ultraviolet and visible light i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/051B01J37/34B01J35/06C02F1/30C02F101/34
CPCC02F1/30B01J27/0515B01J37/348C02F2305/10C02F2101/345B01J35/59Y02W10/33Y02W10/37
Inventor 丛燕青王娟姬云葛耀花张轶王齐
Owner ZHEJIANG GONGSHANG UNIVERSITY
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