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Red titanium dioxide photoelectrode with wedge-shaped structure and preparing and application of red titanium dioxide photoelectrode

A titanium dioxide and photoelectrode technology, applied in chemical instruments and methods, water treatment of special compounds, light water/sewage treatment, etc., can solve the problems of limited application range, poor light absorption capacity and utilization rate, etc., to achieve a firm combination and improve Light absorbing ability, effect of reducing energy consumption

Active Publication Date: 2016-08-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional titanium dioxide is white and can only absorb about 5% of ultraviolet light with a wavelength of less than 400nm in sunlight. It has poor absorption and utilization of light, which limits its application range.

Method used

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  • Red titanium dioxide photoelectrode with wedge-shaped structure and preparing and application of red titanium dioxide photoelectrode
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  • Red titanium dioxide photoelectrode with wedge-shaped structure and preparing and application of red titanium dioxide photoelectrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 A red titanium dioxide photoelectrode with a wedge-shaped structure and its preparation method

[0030] (1) Pretreatment of foamed titanium: Put the foamed titanium (titanium sheet) into a mixed solution containing isopropanol, acetone and deionized water (volume ratio 1:1:1) and ultrasonicate for 1 hour to remove the foamed titanium (titanium sheet) Remove impurities such as oil stains on the surface of the sheet), take out the foamed titanium (titanium sheet), wash it with deionized water for 6 times, and dry it in an oven at 80°C for use.

[0031] (2) Preparation of photoelectrodes: at room temperature

[0032] ①Put two pieces of pretreated titanium foam (2cm×4cm×1mm) on two sides containing 4mol·L -1 Sodium hydroxide solution in the polytetrafluoroethylene lining, sealed and placed in the reaction kettle, and then placed in a 180°C oven for 4h and 24h respectively;

[0033] ② After the reaction, open the reaction kettle, take out two pieces of foamed tit...

Embodiment 2

[0041] Example 2 A preparation method of a red titanium dioxide photoelectrode with a wedge-shaped structure

[0042] (1) Pretreatment of foamed titanium: immerse the foamed titanium (titanium sheet) in a mixed solution containing isopropanol, acetone and deionized water (volume ratio 1:1:1) for 1 h to remove the foamed titanium (titanium sheet) ) on the surface, then take out the foamed titanium (titanium sheet), wash it 10 times with deionized water, and dry it in an oven at 80°C for use;

[0043] (2) Preparation of photoelectrodes: at room temperature

[0044] ①Immerse a piece of pretreated titanium foam (2cm×4cm×1mm) in a solution containing 4mol L -1 In the polytetrafluoroethylene lining of sodium hydroxide solution, put it into the reaction kettle after sealing, and then put it in an oven at 180 ° C for 5 hours;

[0045] ② After the reaction, take out the foamed titanium, wash it with deionized water and place it in 2mol·L -1 Nitric acid solution for 36 hours, and the...

Embodiment 3

[0047] Example 3 Application of a red titanium dioxide photoelectrode with a wedge-shaped structure

[0048] Assembly of the photocatalytic degradation system: the red titanium dioxide prepared in Example 1 was used as the anode, the cleaned and dried titanium sheet was used as the cathode, and the high-pressure xenon lamp was used as the light source to degrade pollutants by photocatalysis.

[0049] The distance between the anode and the cathode is 1.5 cm, and the distance between the light source and the anode is 8 cm. The effective illumination area of ​​the anode is 5cm 2 . The photoelectrochemical reactor is equipped with 70mL of the solution to be degraded. In order to disperse the pollutants evenly, the whole experimental process is carried out under the condition of constant stirring.

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Abstract

The invention discloses a red titanium dioxide photoelectrode with a wedge-shaped structure and preparing and application of the red titanium dioxide photoelectrode and belongs to the technical field of photoelectrode preparing and photoelectric catalysis. According to the red titanium dioxide photoelectrode, a simple hydrothermal method is used for the first time, foam titanium is used as a substrate and a titanium source, and the red titanium dioxide photoelectrode with the wedge-shaped structure is finally prepared through alkali liquor etching, hydrogen ion substitution and roasting. The defect that a traditional catalyst is prone to falling is overcome, the titanium dioxide photoelectrode which is macroscopically red is obtained for the first time, and light with the wave length of 400-500nm is limited in a micro-nanometer structure due to color formulation. Thus, the light absorbing ability of titanium dioxide in a visible light region is improved, and the titanium dioxide also has strong absorbing ability in a near infrared region.

Description

Technical field: [0001] The invention belongs to the technical field of photoelectrode preparation and photoelectric catalysis, and in particular relates to a red titanium dioxide photoelectrode with a wedge-shaped structure and its preparation and application. Background technique: [0002] In recent years, titanium dioxide (TiO 2 ) as a semiconductor material with rich sources, stable properties, acid and alkali corrosion resistance, and low price, is widely used in photocatalysis, photoelectrocatalysis, solar cells, hydrogen production from water decomposition, and environmental pollutant treatment. Studies have shown that morphology has an important impact on the catalytic performance of titanium dioxide, especially nano-sized titanium dioxide has high catalytic activity. Therefore, the preparation of TiO nanomaterials with controllable morphology has attracted extensive attention. [0003] The Chinese invention patent with the publication number CN 105036186 A disclos...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/30C02F101/20C02F103/30
CPCC02F1/30C02F1/46109C02F2001/46133C02F2101/20C02F2103/30C02F2305/10
Inventor 刘会娟刘春雷兰华春刘锐平曲久辉
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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