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Electrochemical self-doped WO3 particle-supported TiO2 nanotube, and preparation method and application thereof

A nanotube, electrochemical technology, applied in the field of photocatalytic materials, can solve the problems of poor photocatalytic photocatalytic performance, limited capacity, narrow visible light response range, etc., to achieve the effect of improving photocatalytic performance and inhibiting recombination

Active Publication Date: 2019-04-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention solves the technical problems of limited photoresponsive catalyst defect capacity, narrow response range to visible light, and poor photocatalytic and photoelectric catalytic performance in the prior art

Method used

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  • Electrochemical self-doped WO3 particle-supported TiO2 nanotube, and preparation method and application thereof
  • Electrochemical self-doped WO3 particle-supported TiO2 nanotube, and preparation method and application thereof
  • Electrochemical self-doped WO3 particle-supported TiO2 nanotube, and preparation method and application thereof

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Experimental program
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preparation example Construction

[0042] Modified self-doping WO 3 Particle loaded TiO 2 A method for preparing nanotubes, comprising the steps of:

[0043] (1) Under the two-electrode system, the titanium sheet was placed as the working electrode in the - In the electrolytic solution, etch for 2-20 hours under the condition of constant voltage of 20V-80V. Will get TiO 2 The nanotube precursor is fired at a certain temperature of 400-600°C for 60-240min to obtain TiO 2 nanotube.

[0044] TiO can also be prepared by sol-gel method, hydrothermal method, magnetron sputtering method or atomic layer deposition method in the prior art 2 precursor, and then calcined to obtain TiO 2 Nano.

[0045] (2) the precursor TiO obtained in step (1) 2 The nanotube precursor is used as the working electrode. Under the three-electrode system, the electrochemical deposition method is used, and the mixed solution of EDTA, ammonium acetate and sodium tungstate is used as the electrolyte. Under the condition of constant curre...

Embodiment 1

[0049] A modified self-doping TiO 2 A method for preparing a nanotube-based visible light photocatalyst, comprising the following steps: the photocatalyst is visible light responsive TiO 2 Nanotube-based photocatalysts.

[0050] (1) Preparation of TiO 2 nanotube

[0051] The Ti sheet was cut to a size of 3cm×3.5cm, immersed in an ethylene glycol solution containing 3.119g / L ammonium fluoride and 13.75% (volume ratio) deionized water under a two-electrode system, and a platinum electrode was used as a counter electrode at 60V Voltage etching for 8 hours. Will get TiO 2 The nanotube precursor was placed in a muffle furnace and calcined at 450 °C for 120 min to obtain anatase TiO 2 nanotube.

[0052] (2) Preparation of WO 3 / TiO 2 nanotube

[0053] With the TiO obtained in step (1) 2 The nanotube was used as the working electrode, the saturated calomel electrode was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode. 3 E...

Embodiment 2

[0075] A modified self-doping TiO 2 A method for preparing a nanotube-based visible light photocatalyst, comprising the following steps: the photocatalyst is visible light responsive TiO 2 Nanotube-based photocatalysts.

[0076] (1) Preparation of TiO 2 nanotube

[0077] The Ti sheet was cut to a size of 3cm×3.5cm, immersed in an ethylene glycol solution containing 0.1g / L ammonium fluoride and 20% (volume ratio) deionized water under a two-electrode system, and a platinum electrode was used as a counter electrode at 20V Voltage etching for 20 hours. Will get TiO 2The nanotube precursor was placed in a muffle furnace and calcined at 400 °C for 240 min to obtain anatase TiO 2 nanotube.

[0078] (2) Preparation of WO 3 / TiO 2 nanotube

[0079] With the TiO obtained in step (1) 2 The nanotube was used as the working electrode, the saturated calomel electrode was used as the reference electrode, and the platinum sheet electrode was used as the counter electrode. 3 Electr...

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Abstract

The invention discloses an electrochemical self-doped WO3 particle-supported TiO2 nanotube, and a preparation method and an application thereof, and belongs to the field of photocatalysis materials. WO3 nanoparticles are loaded on the inner wall and the outer wall of a TiO2 nanotube; and the above compound contains W<5+> defects and Ti<3+> defects and oxygen vacancies associated with the W<5+> defects and Ti<3+> defects. The TiO2 nanotube is modified with the supported WO3, and is further modified by electrochemical reduction treatment to change the defect capacity and the response range to visible lights, so the photocatalytic and photoelectrocatalytic performances of the TiO2 nanotube are improved. The material has a high degradation efficiency when applied to the photocatalytic degradation of indoor volatile organic compounds and the photoelectric degradation of antibiotic solutions.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, more specifically, relates to an electrochemical self-doping type WO 3 Particle loaded TiO 2 Nanotubes and their preparation methods and applications. Background technique [0002] Since 1972, Japanese scientists Fujishima and Honda first published on n-semiconductor TiO 2 Since the report of the photoelectrocatalytic decomposition of water found on the electrode, TiO 2 With unique optical properties and high photocatalytic activity, it has been widely developed in the fields of optical materials, photoelectrochemistry, photoelectromagnetics, and photocatalytic degradation of pollutants. Carbon nanotubes were discovered by Iij ima et al. in 1991. Due to their unique structure and excellent properties, one-dimensional nanomaterials (such as nanowires, nanotubes, and nanofilms) have received widespread attention and research. TiO 2 Nanotube arrays as TiO 2 Two-dimensional nanomaterials...

Claims

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Application Information

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IPC IPC(8): B01J23/30B01J35/10C02F1/30C02F1/461C02F1/72B01D53/86B01D53/72B01D53/44C02F101/34C02F101/38
CPCB01D53/007B01D53/864B01D53/8687C02F1/30C02F1/4672B01J23/002B01J23/30C02F2101/40C02F2101/38C02F2101/34C02F2305/10C02F2305/023B01D2257/708B01D2257/7027B01D2259/804B01J35/39B01J35/61
Inventor 张延荣汪晓光
Owner HUAZHONG UNIV OF SCI & TECH
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