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Arc discharge process of preparing nanometer titania with visible light absorbing photocatalysis activity

A nano-titanium oxide and photocatalytic technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of complex preparation process, hindering the photocatalytic performance of titanium oxide, and less visible light absorption. To achieve the effect of broad application prospects

Inactive Publication Date: 2007-11-14
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the related preparation process is relatively complicated, the structure of titanium oxide is difficult to control, and the visible light absorption is low. These problems seriously hinder the further improvement of the photocatalytic performance of titanium oxide, thus affecting its practical application.

Method used

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  • Arc discharge process of preparing nanometer titania with visible light absorbing photocatalysis activity
  • Arc discharge process of preparing nanometer titania with visible light absorbing photocatalysis activity
  • Arc discharge process of preparing nanometer titania with visible light absorbing photocatalysis activity

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Experimental program
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Effect test

Embodiment 1

[0031] The cathode is a pure tungsten electrode with a diameter of 10mm and the anode disc is a 99.9% titanium plate with a diameter of 100mm. Fill the reaction chamber with 30kPa helium, 10kPa nitrogen, and 4kPa oxygen, and adjust the angle between the cathode rod and the upper surface of the anode disc to be 30°. 2 g of titanium oxide were obtained after 45 minutes of arc discharge (direct current, 200 A) between the two electrodes. The obtained product is nitrogen-doped titanium oxide with a diameter of less than 17nm, mixed rutile phase and anatase phase, and the doping amount of nitrogen is 0.001% (atomic percentage).

Embodiment 2

[0033] The cathode is a pure tungsten electrode with a diameter of 5mm and the anode disc is a 99.9% titanium plate with a diameter of 50mm. Fill the reaction chamber with 90kPa helium, 10kPa nitrogen, and 20kPa oxygen, and adjust the cathode rod and the upper surface of the anode disc to form an angle of 30°. 4 g of titanium oxide were obtained after 45 minutes of arc discharge (direct current, 200 A) between the two electrodes. The obtained product is 14nm in diameter, rutile phase, titanium oxide doped with nitrogen, and the doping amount of nitrogen is 0.01% (atomic percentage).

Embodiment 3

[0035] The cathode is a pure tungsten electrode with a diameter of 10mm, and the anode is a 99.9% titanium plate, which is a square plate with a side length of 150mm. Fill the reaction chamber with 100kPa helium, 100kPa nitrogen, and 15kPa oxygen, and adjust the cathode rod and the upper surface of the anode disc to form an angle of 60°. 3 g of titanium oxide were obtained after 45 minutes of arc discharge (direct current, 200 A) between the two electrodes. The obtained product is 13 nm in diameter, rutile phase, titanium oxide doped with nitrogen, and the doping amount of nitrogen is 5% (atomic percentage).

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Abstract

The arc discharge process of preparing nanometer titania capable of absorbing visible light for photocatalysis includes filling buffering gas of certain pressure into reactor and controlling the pressure of the mixed gas and the pressures of different gas components in the buffering gas, and can prepare titania of different crystal forms and different crystal grain sizes. Selecting proper mixed gas can dope nitrogen or carbon into the titania crystal of different crystal forms, with the nitrogen doping amount being controlled in 0.001-5 at.% and carbon in 0.001-5 at.%. Regulating the process parameters can control the shape of titania, spherical or fibrous. The said process can prepare nanometer titania with homogeneous diameter, high optical activity and controlled component and size.

Description

technical field [0001] The invention relates to a preparation technology of photocatalytic titanium oxide, in particular to an arc discharge preparation method of photocatalytic nano titanium oxide capable of absorbing visible light. Background technique [0002] Since Fjjishima et al. reported the photocatalytic splitting of water to produce hydrogen by titanium oxide in 1972, titanium oxide photocatalysis has been a research hotspot all over the world. Theoretical predictions and practical studies have shown that this material has singular optical, electrical, and magnetic properties, and is expected to be widely used in many fields such as sewage treatment, photosensitive, gas sensitive sensors, and new energy. [0003] Titanium oxide is a wide bandgap n-type semiconductor material with three different crystal structures, and their corresponding properties are different. However, the basic photocatalytic titanium oxide prepared by conventional methods has the disadvantag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J37/14B01J37/34
Inventor 成会明陈志刚李峰逯高清丛洪涛刘岗
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI