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Bromine 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 short life, limited visible light utilization, low photocatalytic activity, etc.

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
However, these methods all use metal elements to modify TiO 2 , modified TiO 2 Photocatalytic activity, especially under visible light, is unsatisfactory

Method used

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  • Bromine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light
  • Bromine adulterated photocatalytic multicrystal material possessing photocatalytic performance under visible light
  • Bromine 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 bromine-doped photocatalytic polycrystalline material, the crystal phase is anatase phase; the content of titanium accounts for 54.55%, the content of oxygen accounts for 35.45%; the content of bromine accounts for 10.00%. Photocatalytic experiments prove that the photocatalytic activity of the bromine-doped photocatalytic polycrystalline material is 4 times that of titanium dioxide powder (P25 type) under visible light irradiation.

[0021] 30 ml of hydrogen bromide solution (2 mol / L) was reacted with 20 ml 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 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 hour...

Embodiment 2

[0023] In the prepared bromine-doped photocatalytic polycrystalline material, the crystal phases are anatase phase and crystal redite phase coexistence; the content of titanium accounts for 59.90%; the content of oxygen accounts for 40.00%; the content of bromine accounts for 0.10%. Photocatalytic experiments proved that the photocatalytic activity of the bromine-doped photocatalytic polycrystalline material was 5 times that of titanium dioxide powder (P25 type) under visible light irradiation.

[0024] 15ml of bromine aqueous solution (3% by mass) was reacted with 15ml of tetrabutyl titanate (>98.0% by mass) 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 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, an...

Embodiment 3

[0026] The prepared bromine-doped photocatalytic polycrystalline material has an anatase crystal phase; the content of titanium accounts for 59.78%, the content of oxygen accounts for 39.90%; the content of bromine accounts for 0.32%. Photocatalytic experiments prove that the photocatalytic activity of the bromine-doped photocatalytic polycrystalline material is 6 times that of titanium dioxide powder (P25 type) under visible light irradiation.

[0027] 15ml of hydrogen bromide solution (2mol / L) was reacted with 10ml 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 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 300° C. for 2 hours to obtain a br...

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Abstract

A bromine-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 bromine, and its weight percentage is: the content of titanium accounts for 54.55%-59.90%; the content of oxygen accounts for 35.45%-40.00%; the content of bromine accounts for 0.10%-10.00%. The coexistence of non-bonding and bonding exists in photocatalytic polycrystalline materials. When existing in the form of bonding, bromine and titanium elements exist in the lattice of photocatalytic crystal materials in the form of Ti-Br chemical bonds; in the form of non-bonding When the mode exists, bromine is intercalated in the interstices of the photocatalytic crystal material. The present invention reduces its original forbidden band width to the extent that visible light (400-800nm) range can be used by bromine doping, because the material of the present invention has the forbidden band width that can also be excited by visible light irradiation, thereby realizing the visible light It has high catalytic activity under visible light.

Description

technical field [0001] The invention relates to a crystal material, in particular to a bromine-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 蔡伟民徐俊王正鹏
Owner SHANGHAI JIAOTONG UNIV
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