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A loaded zno/al with a flaky appearance 2 o 3 Composite photocatalytic film and preparation method thereof

A composite photocatalytic and supported technology, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as limitations, low specific surface area, and low porosity , to achieve the effect of good combination, good application prospect and strong practicability

Active Publication Date: 2020-06-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ubiquitous low porosity and low specific surface area of ​​such catalytic membranes severely limit their practical application.
At present, the improvement methods for this problem still have great limitations

Method used

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  • A loaded zno/al with a flaky appearance <sub>2</sub> o <sub>3</sub> Composite photocatalytic film and preparation method thereof
  • A loaded zno/al with a flaky appearance <sub>2</sub> o <sub>3</sub> Composite photocatalytic film and preparation method thereof
  • A loaded zno/al with a flaky appearance <sub>2</sub> o <sub>3</sub> Composite photocatalytic film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) 7075 aluminum alloy substrate pretreatment: the 7075 aluminum alloy substrate is successively water-grinded with 220#, 400#, 1000#, 2000#, 5000# sandpaper until the surface is smooth, and ultrasonically cleaned with absolute ethanol and distilled water respectively ;

[0028] (2) Preparation of plasma electrolytic oxidation carrier film: prepare electrolyte solution A containing 6 g / L sodium aluminate, 12 g / L potassium hydroxide, 4 g / L potassium ferrocyanide and solvent distilled water; ) The pretreated substrate is connected to the anode of the DC power supply, and the stainless steel sheet is used as the cathode, and the plasma electrolytic oxidation treatment is performed in the electrolyte solution A, the reaction voltage is 300V, and the reaction time is 120 min, and the plasma electrolytic oxidation carrier film is prepared;

[0029] (3) Electrodeposition treatment: Prepare electrolyte solution B containing 5 mM zinc nitrate, 5 mM urotropine, 0.5 M potassium c...

Embodiment 2

[0032] (1) 7075 aluminum alloy substrate pretreatment: the 7075 aluminum alloy substrate is successively water-grinded with 220#, 400#, 1000#, 2000#, 5000# sandpaper until the surface is smooth, and ultrasonically cleaned with absolute ethanol and distilled water respectively ;

[0033] (2) Preparation of plasma electrolytic oxidation carrier film: prepare electrolyte solution A containing 4 g / L sodium aluminate, 10 g / L potassium hydroxide, 2 g / L potassium ferrocyanide and solvent distilled water; ) The pretreated substrate is connected to the anode of the DC power supply, and the stainless steel sheet is used as the cathode, and the plasma electrolytic oxidation treatment is performed in the electrolyte solution A, the reaction voltage is 280V, and the reaction time is 60 min to prepare the plasma electrolytic oxidation carrier film;

[0034] (3) Electrodeposition treatment: prepare electrolyte solution B containing 1 mM zinc nitrate, 1 mM urotropine, 0.1 M potassium chloride...

Embodiment 3

[0037] (1) 7075 aluminum alloy substrate pretreatment: the 7075 aluminum alloy substrate is successively water-grinded with 220#, 400#, 1000#, 2000#, 5000# sandpaper until the surface is smooth, and ultrasonically cleaned with absolute ethanol and distilled water respectively ;

[0038] (2) Preparation of plasma electrolytic oxidation carrier film: prepare electrolyte solution A containing 8 g / L sodium aluminate, 16 g / L potassium hydroxide, 6 g / L potassium ferrocyanide and solvent distilled water; ) The pretreated substrate was connected to the anode of the DC power supply, and the stainless steel sheet was used as the cathode. The plasma electrolytic oxidation treatment was carried out in the electrolyte solution A, the reaction voltage was 320 V, and the reaction time was 120 min. The plasma electrolytic oxidation support film was prepared ;

[0039] (3) Electrodeposition treatment: Prepare electrolyte solution B containing 4 mM zinc nitrate, 4 mM urotropine, 0.4 M potassiu...

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Abstract

The invention discloses a supported ZnO / Al with a flaky appearance 2 O 3 Composite photocatalytic film and its preparation method. The method includes the following steps: (1) Pretreating the surface of a 7075 aluminum alloy substrate, and using plasma electrolytic oxidation technology to prepare a high-porosity carrier film in situ on the substrate surface; (2) ZnO is deposited on the surface of the carrier film in step (1) using an electrodeposition method to prepare a composite photocatalytic film with a flaky appearance. The process of the invention is simple, green and environmentally friendly, and the obtained carrier film has high porosity and good adhesion, and its main component is Al. 2 O 3 ;After electrodeposition post-treatment, evenly distributed flaky ZnO can be obtained on the surface of the carrier film. The supported ZnO / Al 2 O 3 The composite membrane has a good catalytic structure and has good application prospects.

Description

technical field [0001] The invention relates to the field of preparation of composite photocatalytic membranes, in particular to a loaded ZnO / Al with sheet-like appearance 2 o 3 Composite photocatalytic film and its preparation method. Background technique [0002] Plasma electrolytic oxidation technology has the characteristics of simple process and green environmental protection. In recent years, it has been widely used in the surface modification of aluminum, magnesium, titanium and their alloys for the purpose of preparing different functional oxide films. Plasma electrolytic oxidation film generally has the advantages of corrosion resistance and wear resistance, high adhesion and adjustable film composition, showing great development potential in the field of catalysis. In recent years, many scholars at home and abroad have begun to use this technology to prepare metal oxide films in situ on metal surfaces, and use such films as catalyst support films or directly as c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/06B01J21/04B01J35/06B01J37/34
CPCB01J21/04B01J23/002B01J23/06B01J37/348B01J35/59B01J35/39
Inventor 陈砺余希文严宗诚
Owner SOUTH CHINA UNIV OF TECH
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