Monatomic noble metal anchoring defect type WO3/TiO2 nanotube as well as preparation and application thereof

A nanotube and noble metal technology, applied in the field of photocatalytic materials, can solve the problems of easy deactivation, limited capacity, poor photocatalytic performance, etc., and achieve the effect of high efficiency, easy operation and control

Active Publication Date: 2020-04-03
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a single-atom precious metal-anchored defect-type WO 3 / TiO 2 Nanotubes, their preparation and applications, which anchor defect-type WO by employing noble metal single atoms 3 / TiO 2 Nanotubes prevent the aggregation of single atoms and improve their photocatalytic performance, thereby solving the problems of limited photoresponsive catalyst defect capacity, narrow response range to visible light, easy aggregation of noble metal single atoms, poor photocatalytic performance and easy deactivation in the prior art other technical issues

Method used

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  • Monatomic noble metal anchoring defect type WO3/TiO2 nanotube as well as preparation and application thereof
  • Monatomic noble metal anchoring defect type WO3/TiO2 nanotube as well as preparation and application thereof
  • Monatomic noble metal anchoring defect type WO3/TiO2 nanotube as well as preparation and application thereof

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preparation example Construction

[0045] A single-atom noble metal-anchored defect-type WO 3 / TiO 2 A method for preparing a nanotube composite, comprising the steps of:

[0046] (1) in TiO 2 Depositing WO on the inner and outer walls of nanotubes 3 nanoparticles, calcined so that the WO 3 Nanoparticles crystallized to obtain WO loaded on the inner and outer walls 3 Nanoparticles of TiO 2 nanotube;

[0047] (2) Loaded WO on the inner and outer walls obtained in step (1) 3 Nanoparticles of TiO 2 Nanotubes undergo electrochemical reduction, and by controlling the potential and time of electrochemical reduction, some WO 3 The nanoparticles are reduced to form W 5+ defects, resulting in W 5+ Defective WO 3 Nanoparticle loaded TiO 2 Nanotube composites;

[0048] (3) with the step (2) obtained containing W 5+ Defective WO 3 Nanoparticle loaded TiO 2 The nanotube composite is used as the working electrode, and noble metal single atoms are supported in the composite by electrochemical deposition. WO 3...

Embodiment 1

[0081] A modified 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.

[0082] (1) Preparation of TiO 2 nanotube

[0083] 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.

[0084] (2) Preparation of WO 3 / TiO 2 nanotube

[0085] 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 Electrochemic...

Embodiment 2

[0110] 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.

[0111] (1) Preparation of TiO 2 nanotube

[0112] 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 2 The nanotube precursor was placed in a muffle furnace and calcined at 400 °C for 240 min to obtain anatase TiO 2 nanotube.

[0113] (2) Preparation of WO 3 / TiO 2 nanotube

[0114] 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 Elect...

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Abstract

The invention belongs to the field of photocatalytic materials, and particularly relates to a monatomic noble metal anchoring defect type WO3/TiO2 nanotube as well as preparation and application thereof. WO3 particle loaded TiO2 nanotubes are modified by adopting electrochemical reduction, and are subjected to electrochemical treatment to further load monatomic noble metals, so that the electron transport capacity and hole electron pair composite performance of the WO3 particle loaded TiO2 nanotubes are improved, and the photocatalytic performance of the WO3 particle loaded TiO2 nanotubes is improved. Oxygen vacancies on the surfaces of WO3 particles stabilize the monatomic noble metals, the noble metals are prevented from being agglomerated and inactivated, and the material is applied tophotocatalytic degradation of indoor volatile organic compounds and has higher degradation efficiency and stability.

Description

technical field [0001] The invention belongs to the field of photocatalytic materials, and more specifically relates to a single-atom noble metal anchor defect type WO 3 / TiO 2 Nanotubes, their preparation 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 have attracte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/02B01J37/34B01D53/86B01D53/44
CPCB01D53/8687B01D2257/708B01D2258/06B01J23/002B01J23/30B01J35/004B01J35/023B01J37/348
Inventor 张延荣汪晓光
Owner HUAZHONG UNIV OF SCI & TECH
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