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Preparation method of titanium dioxide nanotube thin film with visible-light activity

A technology based on titanium dioxide and visible light, which is applied in chemical instruments and methods, photosensitive equipment, and climate sustainability. It can solve the problems of limited application range, low sunlight utilization rate, and large band gap, and achieve simple process and enhanced photoelectricity. The effect of response

Inactive Publication Date: 2013-02-27
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large band gap of TiO2 (3.2eV, sharp mineral type, 3.0eV, rutile type), it can only absorb ultraviolet light, and the utilization rate of sunlight is low, which greatly limits Its scope of application

Method used

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  • Preparation method of titanium dioxide nanotube thin film with visible-light activity
  • Preparation method of titanium dioxide nanotube thin film with visible-light activity
  • Preparation method of titanium dioxide nanotube thin film with visible-light activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The Ti sheet treated with the polishing solution was used as the anode, the graphite sheet was used as the cathode, and the 0.5% HF solution was used as the electrolyte, and the voltage of 20V was controlled by a DC stabilized power supply, anodized for 40 min under magnetic stirring, and finally washed repeatedly with deionized water clean and dry with air flow to obtain TiO 2 nanotube film. In the muffle furnace, after 450 o C annealing treatment for 2 hours, you can get anatase TiO 2 nanotubes (such as figure 2 shown).

[0023] The carbon quantum dot solution was prepared by electrochemical anodic oxidation method. Preparation of Carbon Quantum Dots Modified TiO by Direct Impregnation Assembly 2 nanotube film. TiO 2 The nanotube film was immersed in the carbon quantum dot solution for 3 hours. Take out the sample, wash off the residual liquid on the surface with deionized water, and put it under N 2 Blow dry on airflow and set aside.

[0024] A three-elec...

Embodiment 2

[0026] TiO 2 The preparation process of the nanotube thin film is as in Example 1. TiO2 The nanotube film was immersed in the carbon quantum dot solution for 6 hours. Remove the sample, rinse off the surface solution with deionized water, and 2 Blow dry on airflow and set aside.

[0027] A three-electrode system was used to test the photoelectrochemical performance of thin film electrodes, and TiO 2 The nanotube film electrode is the working electrode, the platinum sheet is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the electrolytic cell with a quartz window is selected, and the electrolyte is 0.5 mol . L -1 Na 2 SO 4 solution. CHI660A electrochemical workstation produced by Shanghai Chenhua Instrument Co., Ltd. was used. The simulated sun light source adopts a 500W short-arc xenon lamp produced by Beijing Changtuo Technology Co., Ltd. The incident light passes through a quartz water tank to filter out infrared light to obtain ultravi...

Embodiment 3

[0029] TiO 2 The preparation process of the nanotube thin film is as in Example 1. TiO 2 The nanotube film was immersed in the carbon quantum dot solution for 9 hours. Remove the sample, rinse off the surface solution with deionized water, and 2 Blow dry on airflow and set aside.

[0030] A three-electrode system was used to test the photoelectrochemical performance of thin film electrodes, and TiO 2 The nanotube film electrode is the working electrode, the platinum sheet is the counter electrode, the Ag / AgCl electrode is the reference electrode, and the electrolytic cell with a quartz window is selected, and the electrolyte is 0.5 mol . L -1 Na 2 SO 4 solution. CHI660A electrochemical workstation produced by Shanghai Chenhua Instrument Co., Ltd. was used. The simulated sun light source adopts a 500W short-arc xenon lamp produced by Beijing Changtuo Technology Co., Ltd. The incident light passes through a quartz water tank to filter out infrared light to obtain ultra...

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Abstract

The invention belongs to the technical field of nano titanium dioxide photoelectrochemistry and photocatalysis and particularly relates to a preparation method of a titanium dioxide nanotube thin film with visible-light activity. Raw materials used for preparing the titanium dioxide nanotube thin film comprise a metallic titanium sheet or a Ti thin film and carbon quantum dot solution. A direct-current regulated power supply is used for anode oxidization. A muffle furnace is used for heat treatment. The preparation method of the titanium dioxide nanotube thin film with visible-light activity specifically comprises the following steps of preparing a TiO2 nanotube array on the metallic Ti sheet or the Ti thin film by adopting an anode oxidation method, and after annealing treatment, preparing a TiO2 nanotube composite thin film with visible-light activity modified by carbon quantum dots by directly adopting a dipping assembling method, wherein the modification quantity of the carbon quantum dots is adjusted by controlling dipping time. The preparation method of the titanium dioxide nanotube thin film with visible-light activity has the advantages that the process is simple, any expensive equipment and high-cost or toxic drugs are not used, the principle of energy saving and emission reduction is satisfied and a new concept for the modification and the application of titanium dioxide is developed.

Description

technical field [0001] The invention belongs to the technical field of photoelectrochemistry and photocatalysis of nano titanium dioxide, and in particular relates to a preparation method of a titanium dioxide nanotube film with visible light activity. Background technique [0002] Since Fujishima and Honda discovered in 1972 that semiconductor titanium dioxide electrodes can decompose water into hydrogen and oxygen under ultraviolet light, titanium dioxide has received extensive attention in the field of materials. TiO 2 It can be used in photocatalytic degradation of organic matter and hydrogen production, sterilization, sewage treatment, air purification and many other aspects. Due to TiO 2 The bandgap width is large (3.2eV, sharp mineral type, 3.0eV, rutile type), can only absorb ultraviolet light, and the utilization rate of sunlight is low, which greatly limits its application range. At present, nano-TiO with visible light activity 2 The preparation method research...

Claims

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Application Information

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IPC IPC(8): B01J21/18H01G9/042H01G9/20H01L31/18
CPCY02P70/50
Inventor 崔晓莉陈希孙明轩
Owner FUDAN UNIV
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