Z-type heterojunction Cu2O_graphene_alpha-Fe2O3 nanotube array photocatalyst and preparation thereof

A nanotube array, photocatalyst technology, applied in anodizing, electrodes, electrolytic coatings, etc., can solve problems such as hindering wide application, semiconductor oxidation of heterojunction photocatalytic materials, and reduction in reducing ability.

Inactive Publication Date: 2018-01-09
JIANGXI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in Cu 2 O / α-Fe 2 o 3 Type-II charge transfer mainly occurs on heterojunction materials. Although it can inhibit the recombination of photogenerated charges, it makes electrons and holes gather on the low-energy conduction band and valence band respectively. Therefore, the heterojunction Compared with the original single-component semiconductor, the oxidation and reduction ability of junction photocatalytic materials has decreased, which greatly hinders its wide application.

Method used

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  • Z-type heterojunction Cu2O_graphene_alpha-Fe2O3 nanotube array photocatalyst and preparation thereof
  • Z-type heterojunction Cu2O_graphene_alpha-Fe2O3 nanotube array photocatalyst and preparation thereof
  • Z-type heterojunction Cu2O_graphene_alpha-Fe2O3 nanotube array photocatalyst and preparation thereof

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Effect test

Embodiment 1

[0032] (1) A high-purity iron sheet (10 mm × 25 mm × 1.5 mm) polished with sandpaper was ultrasonically treated in absolute ethanol and distilled water for 10 min, and dried with nitrogen gas for later use. With pretreated iron sheet as anode, platinum sheet as cathode, 0.05wt% NH 4 F ethylene glycol solution (which contains 0.5% deionized water by volume fraction) is the electrolyte, at 30V, 10°C, oxidation reaction for 1min, then ultrasonic treatment in deionized water for 5min to remove the first anodic oxidation Nanoporous oxide layer; then use the iron sheet that has been oxidized once as the anode, and the platinum sheet as the cathode. In the same electrolyte, the second anodic oxidation reaction continues for the same time under the same oxidation conditions. After the oxidation reaction, the obtained iron sheet samples were rinsed with deionized water, dried with nitrogen, and placed in a muffle furnace under an oxygen atmosphere at 200°C, calcined at a constant tempe...

Embodiment 2

[0036] (1) A high-purity iron sheet (10 mm × 25 mm × 1.5 mm) polished with sandpaper was ultrasonically treated in absolute ethanol and distilled water for 10 min, and dried with nitrogen gas for later use. With pretreated iron sheet as anode, platinum sheet as cathode, 0.1wt% NH 4 F ethylene glycol solution (which contains 1% deionized water by volume fraction) is the electrolyte, at 40V, 15°C, oxidation reaction 2min, then ultrasonic treatment in deionized water for 5min to remove the first anodic oxidation formed Nanoporous oxide layer; then use the iron sheet that has been oxidized once as the anode, and the platinum sheet as the cathode. In the same electrolyte, the second anodic oxidation reaction continues for the same time under the same oxidation conditions. After the oxidation reaction, the obtained iron sheet samples were rinsed with deionized water, dried with nitrogen, and placed in a muffle furnace under an oxygen atmosphere at 300°C, calcined at a constant tempe...

Embodiment 3

[0040] (1) A high-purity iron sheet (10 mm × 25 mm × 1.5 mm) polished with sandpaper was ultrasonically treated in absolute ethanol and distilled water for 10 min, and dried with nitrogen gas for later use. With pretreated iron sheet as anode, platinum sheet as cathode, 0.2wt% NH 4 F ethylene glycol solution (which contains 2% deionized water by volume fraction) is the electrolyte, at 50V, 20°C, oxidation reaction for 5min, then ultrasonic treatment in deionized water for 5min to remove the first anodic oxidation formed Nanoporous oxide layer; then use the iron sheet that has been oxidized once as the anode, and the platinum sheet as the cathode. In the same electrolyte, the second anodic oxidation reaction continues for the same time under the same oxidation conditions. After the oxidation reaction, the obtained iron sheet samples were rinsed with deionized water, dried with nitrogen, and placed in a muffle furnace under an oxygen atmosphere at 400°C, calcined at a constant t...

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Abstract

The invention relates to a Z-type heterojunction Cu2O_graphene_alpha-Fe2O3 nanotube array photocatalyst material and a preparation method of the Z-type heterojunction Cu2O_graphene_alpha-Fe2O3 nanotube array photocatalyst material. The method comprises the following steps that firstly, an alpha-Fe2O3 nanotube array (FNA) is prepared on a pure iron slice by conducting an anodic oxidation method twice; secondly, graphene oxide is deposited on the FNA surface prepared in the first step through an electrochemical cyclic voltammetry method and is reduced to graphene (G), and a G / FNA composite is obtained; thirdly, Cu2O nanoparticles are deposited on the surface of the G / FNA prepared in the second step in a copper-containing saline solution through a potentiostatic method, and the ternary Z-typeheterojunction Cu2O / G / FNA photocatalyst is formed. According to the Z-type heterojunction Cu2O_graphene_alpha-Fe2O3 nanotube array photocatalyst material and preparation, the graphene layer serves asan electronic transmission mediator and is capable of effectively guiding photo-generated electrons on the FNA to migrate along the Z-type path and be subjected to quenching together with photo-generated holes in Cu2O, in this way, the spatial separation of the photo-generated electrons and hole pairs can be promoted, and the high oxidation reduction capacity of the composite is remained as well.The photocatalyst material not only has the good photocataltic performance, but also presents the good photocataltic stability.

Description

technical field [0001] The invention belongs to the field of environmental materials, in particular to a Z-type heterojunction Cu 2 O_graphene_α-Fe 2 o 3 Nanotube array photocatalyst and preparation method thereof. Background technique [0002] Photocatalytic technology is an advanced oxidation technology (AOPs) that has emerged in recent years. It is widely used in the field of environmental governance, especially in the field of sewage treatment, showing a good application prospect. As the core of the development and application of photocatalytic technology, photocatalyst has attracted the attention of researchers from all over the world. α-Fe 2 o 3 It is a typical n-type semiconductor material, which has the advantages of non-toxicity, low cost, and stable chemical properties; its band gap is 2.1eV, and it is suitable as a photocatalytic material excited by sunlight, so it is widely used in photocatalysis and solar energy Research in the field of batteries. However...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25D11/34C25D9/10
Inventor 董博
Owner JIANGXI UNIV OF TECH
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