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Iodine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light

A crystalline material, photocatalytic technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low quantum yield, short life, low photocatalytic activity, etc. Catalytic activity, improve photon efficiency, achieve full-frequency absorption effect

Inactive Publication Date: 2006-06-14
SHANGHAI JIAOTONG 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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  • Iodine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light
  • Iodine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light
  • Iodine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the prepared iodine-doped photocatalytic polycrystalline material, the content of titanium accounts for 54.70%, the content of oxygen accounts for 35.30% and the content of iodine accounts for 10.00%.

[0021] 20ml of iodic acid 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 195° C. for 2 hours to obtain an iodine-doped photocatalytic polycrystalline material with high catalytic activity under visible light.

Embodiment 2

[0023] In the prepared iodine-doped photocatalytic polycrystalline material, the content of titanium accounts for 59.95%, the content of oxygen accounts for 39.95% and the content of iodine accounts for 0.10%.

[0024] 10ml of iodic acid 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 500° C. for 2 hours to obtain an iodine-doped photocatalytic polycrystalline material with high catalytic activity under visible light.

Embodiment 3

[0026] In the prepared iodine-doped photocatalytic polycrystalline material, the content of titanium accounts for 60.61%, the content of oxygen accounts for 39.18% and the content of iodine accounts for 0.21%.

[0027] 15ml of iodic acid 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 355° C. for 2 hours to obtain an iodine-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 crystal phase of the iodine-doped photocatal...

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Abstract

An iodine-doped photocatalytic polycrystalline material capable of photocatalytic activity under visible light conditions belongs to the field of inorganic nano photocatalytic materials. It is composed of the following three elements: titanium, oxygen, and iodine, and its weight percentage is: the content of titanium accounts for 54.70%-59.95%, the content of oxygen accounts for 35.30%-39.95%, and the content of iodine accounts for 0.10%-10.00%. Iodine exists in the photocatalytic crystal material in the form of non-bonding and bonding. When it exists in the form of bonding, iodine and titanium exist in the crystal lattice of the photocatalytic crystal material in the form of Ti-I chemical bonds; When the bond mode exists, iodine is intercalated in the interstices of the photocatalytic crystal material. The present invention reduces its original bandgap width to the extent that visible light (400-800nm) can be used by doping iodine, and the material of the present invention has a bandgap width that can also be excited by visible light irradiation, thereby realizing a visible light The full-frequency absorption of the modified TiO can be significantly improved 2 The photon quantum efficiency of the material.

Description

technical field [0001] The invention relates to a crystal material, in particular to an iodine-doped photocatalytic polycrystalline material with 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 excitation lig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J27/08B01J27/135
Inventor 蔡伟民王正鹏徐俊
Owner SHANGHAI JIAOTONG UNIV
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