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Fluorine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light

A photocatalytic, polycrystalline technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of short life, limited visible light utilization, low photocatalytic activity, etc.

Inactive Publication Date: 2004-12-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical applications, titanium dioxide as a photocatalyst still has some defects: on the one hand, TiO 2 The lifetimes of photogenerated electrons and photogenerated holes are extremely short, and the two are easy to recombine, resulting in TiO 2 The quantum yield is low and the photocatalytic activity is not high; on the other hand, TiO 2 The band gap is wide, and the excitation light is limited to ultraviolet light with a wavelength less than 380nm, which limits its utilization of visible light in sunlight
Since the fluorine element appears on the surface of the material in the state of chemical adsorption after bonding with the carbon element, and does not enter the TiO 2 crystal, so TiO cannot be reduced 2 The forbidden band width, so the purpose of using visible light cannot be achieved

Method used

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  • Fluorine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light
  • Fluorine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light
  • Fluorine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the prepared fluorine-doped photocatalytic polycrystalline material, the content of titanium accounts for 44.6%, the content of oxygen accounts for 16.7% and the content of fluorine accounts for 38.7%.

[0021] 20ml of hydrogen fluoride solution (0.5M / L) was reacted with 20ml of tetrabutyl titanate (mass percentage>98.0%) until white precipitate was completely formed. The white precipitate was directly heated in an oven, treated at 120°C for 4 hours, evaporated to remove water and part of the alcohols produced in the reaction to obtain a solid dry product. Then grind the obtained dry solid to make the particles uniform and reduce soft agglomeration. Put it into a muffle furnace after grinding, and calcinate at 200° C. for 2 hours to obtain a fluorine-doped photocatalytic polycrystalline material with high catalytic activity under visible light.

Embodiment 2

[0023] In the prepared fluorine-doped photocatalytic polycrystalline material, the content of titanium accounts for 52.7%, the content of oxygen accounts for 39.4% and the content of fluorine accounts for 7.9%.

[0024] 12ml of hydrogen fluoride solution (0.5M / L) was reacted with 20ml of tetrabutyl titanate (mass percentage>98.0%) until white precipitate was completely formed. The white precipitate was directly heated in an oven, treated at 120°C for 4 hours, evaporated to remove water and part of the alcohols produced in the reaction to obtain a solid dry product. Then grind the obtained dry solid to make the particles uniform and reduce soft agglomeration. Put it into a muffle furnace after grinding, and calcinate at 450° C. for 2 hours to obtain a fluorine-doped photocatalytic polycrystalline material with high catalytic activity under visible light.

Embodiment 3

[0026] In the prepared fluorine-doped photocatalytic polycrystalline material, the content of titanium accounts for 50.6%, the content of oxygen accounts for 22.2% and the content of fluorine accounts for 27.2%.

[0027] 15ml of hydrogen fluoride solution (0.5M / L) was reacted with 20ml of tetrabutyl titanate (mass percentage>98.0%) until a white precipitate was completely formed. The white precipitate was directly heated in an oven, treated at 120°C for 4 hours, evaporated to remove water and part of the alcohols produced in the reaction to obtain a solid dry product. Then grind the obtained dry solid to make the particles uniform and reduce soft agglomeration. Put it into a muffle furnace after grinding, and calcinate at 285° C. for 2 hours to obtain a fluorine-doped photocatalytic polycrystalline material with high catalytic activity under visible light.

[0028] Such as figure 1 As shown, by X-ray diffraction detection, in Example 3, the crystalline phase of the fluorine-...

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Abstract

A F doped photocatalytic polycrystal material with photocatalyzing performance under visual light contains Ti (44.6-52.7 wt.%), O (16.7-39.4) and F (7.9-38.7). It features that its energy gap is lowered to some etent for utilizing visual light (400-800 nm), that is, its energy gap can be triggere by visual light, realizing full-frequency absorption to visual light and increasing its light quantum efficiency.

Description

technical field [0001] The invention relates to a crystal material, in particular to a fluorine-doped photocatalytic polycrystalline material capable of photocatalytic activity under visible light conditions, and belongs to the field of inorganic nano photocatalytic materials. Background technique [0002] Titanium dioxide has good photocatalytic activity and photoelectric performance, and has broad application prospects in many fields such as photocatalytic degradation of organic pollutants in water and air, photoelectrochemical solar cells, and photolysis of water to produce hydrogen. However, in practical applications, titanium dioxide as a photocatalyst still has some defects: on the one hand, TiO 2 The lifetimes of photogenerated electrons and photogenerated holes are extremely short, and the two are easy to recombine, resulting in TiO 2 The quantum yield is low and the photocatalytic activity is not high; on the other hand, TiO 2 The band gap is wide, and the excitat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J27/12B01J27/135
Inventor 蔡伟民王正鹏徐俊
Owner SHANGHAI JIAO TONG UNIV
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