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Heterojunction nano-tube array film photocatalysis material for exposing high-energy surface of anatase titanium dioxide, and preparation method and application of photocatalysis material

A photocatalytic material and nanotube array technology, which can be used in chemical instruments and methods, light water/sewage treatment, textile industry wastewater treatment, etc. Activity and other issues, to achieve the effect of improving degradation performance, good photoelectric catalytic performance, and improving photoelectric catalytic performance

Inactive Publication Date: 2014-06-18
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 Usually exists in the form of {101} facets instead of highly active {001} facets, and the recombination rate of photogenerated electron-hole pairs is high, resulting in low quantum efficiency and inhibiting photocatalytic activity
In addition, TiO 2 The band gap of TiO2 is relatively large (3.2eV), and it can only use ultraviolet light in sunlight (accounting for only 3-5%), which greatly limits the practical application of TiO2

Method used

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  • Heterojunction nano-tube array film photocatalysis material for exposing high-energy surface of anatase titanium dioxide, and preparation method and application of photocatalysis material
  • Heterojunction nano-tube array film photocatalysis material for exposing high-energy surface of anatase titanium dioxide, and preparation method and application of photocatalysis material
  • Heterojunction nano-tube array film photocatalysis material for exposing high-energy surface of anatase titanium dioxide, and preparation method and application of photocatalysis material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 - Preparation of TiO 2 nanotube material

[0032] (1) Cut the Ti foil (purity 99.7%, thickness 0.5mm) into a size of 1×4cm, then clean the cut Ti sheet with detergent, and then fully clean the surface of the Ti sheet with distilled water; then The Ti sheet was ultrasonically cleaned in isopropanol, absolute ethanol, and triple-distilled water for 15 min, and finally the Ti sheet was taken out and dried at 120°C in a blast drying oven for use.

[0033] (2) Put the Ti flakes and Pt pretreated in (1) into a mixture of ethylene glycol (EG), NH 4 In the reaction system composed of F and triple distilled water, the reaction system is ethylene glycol (320ml)+0.5wt%NH 4 F(1.7848g)+3vol.%H 2 O (9.6mL) electrolyte solution, with a constant voltage and constant current power supply to provide a DC power supply of 60V, and magnetically stirred, after anodizing for 30min, take out the sample and use deionized aqueous solution to remove the oxide film ultrasonically, and...

Embodiment 2

[0036] (1) Cut the Ti foil (purity 99.7%, thickness 0.5mm) into a size of 1×4cm, then clean the cut Ti sheet with detergent, and then fully clean the surface of the Ti sheet with distilled water; then The Ti sheet was ultrasonically cleaned in isopropanol, absolute ethanol, and triple-distilled water for 15 min, and finally the Ti sheet was taken out and dried at 120°C in a blast drying oven for use.

[0037] (2) Put the Ti flakes and Pt pretreated in (1) into a mixture of ethylene glycol (EG), NH 4 In the reaction system composed of F and triple distilled water, the reaction system is ethylene glycol (320ml)+0.5wt%NH 4 F(1.7848g)+3vol.%H 2 O (9.6mL) electrolyte solution, with a constant voltage and constant current power supply to provide a DC power supply of 60V, and magnetically stirred, after anodizing for 30min, take out the sample and use deionized aqueous solution to remove the oxide film ultrasonically, and heat it in an electric heating constant temperature blower at...

Embodiment 3

[0042] (1) Cut the Ti foil (purity 99.7%, thickness 0.5mm) into a size of 1×4cm, then clean the cut Ti sheet with detergent, and then fully clean the surface of the Ti sheet with distilled water; then The Ti sheet was ultrasonically cleaned in isopropanol, absolute ethanol, and triple-distilled water for 15 min, and finally the Ti sheet was taken out and dried at 120°C in a blast drying oven for use.

[0043] (2) Put the Ti flakes and Pt pretreated in (1) into a mixture of ethylene glycol (EG), NH 4 In the reaction system composed of F and triple distilled water, the reaction system is ethylene glycol (320ml)+0.5wt%NH 4 F(1.7848g)+3vol.%H 2O (9.6mL) electrolyte solution, with a constant voltage and constant current power supply to provide a DC power supply of 60V, and magnetically stirred, after anodizing for 30min, take out the sample and use deionized aqueous solution to remove the oxide film ultrasonically, and heat it in an electric heating constant temperature blower at ...

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Abstract

The invention discloses a heterojunction nano-tube array film photocatalysis material for exposing the high-energy surface of anatase titanium dioxide, and a preparation method and application of the photocatalysis material. The preparation method comprises the following steps: firstly, preparing a nano-tube array film via anodic oxidation, then preparing a high-energy crystal surface of anatase titanium dioxide with orientation growth and high proportion by means of controlling the time of hydrothermal reaction, simultaneously, preparing a TiO2 / SrTiO3 heterojunction nano-tube array film material, and performing structure modification on nanometer TiO2 by an energy band structure to obtain a novel composite semiconductor material with narrow band width. Photo-generated electron hole recombination is effectively restrained, the quantum yield of the photocatalysis material is enhanced, and the photoelectric converting efficiency is raised, so that the photoelectrocatalysis performance of nanometer TiO2 is greatly improved, and the photocatalysis material has application prospects in the field of photocatalysis.

Description

technical field [0001] The present invention relates to the technical field of photocatalysis, more specifically, to a novel nano-photocatalytic semiconductor composite material and its preparation method and application, especially to an exposed anatase TiO 2 (004) TiO on the high energy surface 2 / SrTiO 3 Heterojunction nanotube array photocatalytic material and its preparation method and application. Background technique [0002] Nano-TiO 2 Due to its stable chemical properties, safety and non-toxicity, high redox ability, and low cost, it has been widely valued. In recent years, TiO 2 Materials in the form of nanoparticles or thin films or composites with other semiconductors are widely used in the fields of dye-sensitized solar cells, photocatalysis, photosensitive devices and sensors. Nano-TiO 2 Crystal type, surface morphology, particle size, pore size and other factors have a great influence on its performance. TiO 2 Usually exist in the form of {101} facets ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/02C02F1/461C02F1/30C02F103/30
Inventor 胡文丽于涛黄娟茹石婷谭欣
Owner TIANJIN UNIV
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