Method for degrading organic substances by using photoelectric catalysis of short TiO2 nano-tube array film electrode

A nanotube array and thin-film electrode technology, which is applied in the field of environmental pollution control, can solve problems affecting the separation efficiency and transfer rate of photogenerated charges, reduce the stability of nanotube array electrodes, and weak binding force between nanotubes and substrates, so as to shorten the anode Oxidation time, improved electrochemical reaction speed, and low photogenerated charge recombination effect

Inactive Publication Date: 2010-12-29
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

At the same time, broken long tubes and other residues generated during the preparation of nanotubes by anodic oxidation in organic electrolytes can easily cause blockage of the nanotube layer.
These reasons all reduce the long TiO 2 The stability of the nanotube array electrode affects the separation efficiency and transfer rate of the photogenerated charge, which in turn affects the TiO 2 Photocatalytic Degradation of Organic Pollutants by Nanotube Array Electrode
TiO prepared by prior art 2 Nanotube arrays, whose anodization process was carried out under magnetic stirring, TiO prepared under stirring conditions 2 Nanotube array electrode, the tube length is longer, and the bonding force between metal titanium and the substrate is weak, which is caused by TiO 2 Nanotube Array Electrode Nanotubes have weak binding force with the substrate and the main reason for poor stability

Method used

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  • Method for degrading organic substances by using photoelectric catalysis of short TiO2 nano-tube array film electrode
  • Method for degrading organic substances by using photoelectric catalysis of short TiO2 nano-tube array film electrode
  • Method for degrading organic substances by using photoelectric catalysis of short TiO2 nano-tube array film electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The cleaned titanium sheet is used as the anode, and the platinum sheet is used as the counter electrode to assemble a two-electrode system, and hydrofluoric acid aqueous solution is added to the reaction vessel as the electrolyte, so that the mass percentage of fluorine ions in the solution reaches 0.5%, and the voltage is adjusted to 20V . During the entire anodic oxidation reaction process, the electrolyte solution is ultrasonically dispersed, and the ultrasonic frequency is 40KHz. After 30 minutes of reaction, the ultrasonic wave is stopped, and the short TiO can be obtained. 2 Nanotube array film samples. Take off the sample, rinse with water and place it in an oven to dry, after being cooled to room temperature, observe through SEM, the prepared titanium-based TiO2 nanotube array, the pipe length is 280nm (see figure 1 ). After sintering the sample in air atmosphere at 400°C for 3 hours, short TiO 2 The nanotube array film electrode can be used as a photoelectr...

Embodiment 2

[0028] The cleaned titanium sheet is used as the anode, and the platinum sheet is used as the counter electrode to assemble a two-electrode system, and hydrofluoric acid aqueous solution is added in the reaction vessel as the electrolyte, so that the mass percentage of fluorine ions in the solution reaches 0.2%, and the voltage is adjusted to 30V . During the entire anodic oxidation process, the electrolyte solution is ultrasonically dispersed, and the ultrasonic frequency is 25KHz. After 1 hour of reaction, short TiO can be obtained. 2 Nanotube array film samples. Remove the sample, wash it with water and dry it in an oven. After cooling to room temperature, observe through SEM, the prepared titanium-based TiO 2 Nanotube array with a tube length of 300nm. After the sample was sintered in an air atmosphere at 500°C for 0.5 hours, short TiO 2 The nanotube array film electrode can be used as a photoelectrocatalytic electrode for the degradation of organic pollutants.

[0029...

Embodiment 3

[0031] The cleaned titanium sheet is used as the anode, and the platinum sheet is used as the counter electrode to assemble a double-electrode system, and hydrofluoric acid aqueous solution is added to the reaction vessel as the electrolyte, so that the mass percentage of fluorine ions in the solution reaches 0.7%, and the voltage is adjusted to 10V . During the entire anodic oxidation process, the electrolyte solution is ultrasonically dispersed, and the ultrasonic frequency is 80KHz. After 60 minutes of reaction, short TiO can be obtained. 2 Nanotube array film samples. Remove the sample, wash it with water and dry it in an oven. After cooling to room temperature, observe through SEM, the prepared titanium-based TiO 2 Nanotube array with a tube length of 70nm. After the sample was sintered in an oxygen atmosphere at 600°C for 3 hours, short TiO 2 The nanotube array film electrode can be used as a photoelectrocatalytic electrode for the degradation of organic pollutants. ...

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Abstract

The invention relates to a method for degrading organic substances by using photoelectric catalysis of a short TiO nano-tube array film electrode, and belongs to the technical field of environment polThe invention relates to a method for degrading organic substances by using photoelectric catalysis of a short TiO nano-tube array film electrode, and belongs to the technical field of environment pol tube length as the electrode, the method has the advantages of low photo-generated charge compound and quick transmission, and shows higher property of degrading the organic substances by photoelecer tube length as the electrode, the method has the advantages of low photo-generated charge compound and quick transmission, and shows higher property of degrading the organic substances by photoelectric catalysis.tric catalysis.lution governance. A cleaned titanium sheet as an anode is placed into an electrolyte solution containing fluorine ions, a platinum electrode as a counter electrode is subjected to anode oxidizing realution governance. A cleaned titanium sheet as an anode is placed into an electrolyte solution containing fluorine ions, a platinum electrode as a counter electrode is subjected to anode oxidizing reaction, the reacted electrolyte solution is subjected to ultrasonic dispersion during the whole anode oxidizing reaction, and the reactants are sintered after the anode oxidization is ended to obtain tction, the reacted electrolyte solution is subjected to ultrasonic dispersion during the whole anode oxidizing reaction, and the reactants are sintered after the anode oxidization is ended to obtain the short TiO2 nano-tube array film electrode. By using the obtained short TiO2 nano-tube array film electrode as a working electrode, Ag-AgCl as a reference electrode and Pt as the counter electrode,he short TiO2 nano-tube array film electrode. By using the obtained short TiO2 nano-tube array film electrode as a working electrode, Ag-AgCl as a reference electrode and Pt as the counter electrode,0.01 to 1 mole of sodium sulfate solution is added into organic pollutant solution, and then the organic pollutants can be degraded. By adopting the firm TiO2 nano-tube array film electrode with short0.01 to 1 mole of sodium sulfate solution is added into organic pollutant solution, and then the organic pollutants can be degraded. By adopting the firm TiO2 nano-tube array film electrode with shorter

Description

technical field [0001] The invention relates to a short TiO 2 The invention relates to a method for photoelectrically degrading organic matter by a nanotube array film electrode, which belongs to the technical field of environmental pollution control. Background technique [0002] Nano-TiO 2 As an excellent photocatalyst, it has been widely used in catalytic oxidation of organic pollutants in the environment. In the past ten years, TiO 2 It has been widely used in textiles, sanitary products, building materials, coatings and other fields, and has excellent photochemical stability, non-toxicity and low price. In 2001, American scientists Grimes et al. used anodic oxidation method to prepare TiO in hydrofluoric acid aqueous medium. 2 Nanotube array films (Gong D W et al J. Mater. Res. (2001) 16:3331-3334). In this material, the photocatalyst TiO 2 The nanotubes are vertically and orderly arranged on the metal titanium substrate, which is beneficial to the separation and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F101/30C02F1/461C02F1/58
Inventor 周保学刘艳彪李金花
Owner SHANGHAI JIAOTONG UNIV
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