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Chlorine adulterted photo catalytic multicrystal material possessing photocatalytic performance under visible light

A photocatalytic and polycrystalline 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, wide band gap, etc., and achieve high photon quantum efficiency Effect

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

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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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  • Chlorine adulterted photo catalytic multicrystal material possessing photocatalytic performance under visible light
  • Chlorine adulterted photo catalytic multicrystal material possessing photocatalytic performance under visible light
  • Chlorine adulterted photo catalytic multicrystal material possessing photocatalytic performance under visible light

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Experimental program
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Effect test

Embodiment 1

[0020] In the prepared chlorine-doped photocatalytic polycrystalline material, the crystal phase is anatase phase; the content of titanium accounts for 54.38%, the content of oxygen accounts for 33.62%; the content of chlorine accounts for 12.00%. Photocatalytic experiments prove that the photocatalytic activity of the chlorine-doped photocatalytic polycrystalline material is 2.2 times that of titanium dioxide powder (P25 type) under visible light irradiation.

[0021] 40 ml of aqueous hydrogen chloride solution (1 mol / L) was reacted with 7 ml 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 210° C....

Embodiment 2

[0023] In the prepared chlorine-doped photocatalytic polycrystalline material, the crystalline phases are anatase phase and crystal redite phase; the content of titanium accounts for 59.90%; the content of oxygen accounts for 40.00%; the content of chlorine accounts for 0.10%. Photocatalytic experiments prove that the photocatalytic activity of the chlorine-doped photocatalytic polycrystalline material is 3.2 times that of titanium dioxide powder (P25 type) under visible light irradiation.

[0024] 8 ml of hydrogen chloride solution (1 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, ...

Embodiment 3

[0026] In the prepared chlorine-doped photocatalytic polycrystalline material, the crystal phase is anatase phase; the content of titanium accounts for 59.25%, the content of oxygen accounts for 39.25%; the content of chlorine accounts for 1.50%. Photocatalytic experiments prove that the photocatalytic activity of the chlorine-doped photocatalytic polycrystalline material is 4.5 times that of titanium dioxide powder (P25 type) under visible light irradiation.

[0027] 15ml of hydrogen chloride solution (1mol / 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 hour...

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Abstract

A Cl doped photocatalytic polycrystal material with photocatalyzing performance under visual light contains Ti (S4.38-59.90 wt.%), O (33.62-40.00), and Cl (0.10-12.00). It features that its energy gap is lowered to some extent for utilizing visual light (400-800 nm), that is, its energy gap can be triggered by visual light, realizing the fully-frequency absorption to visual light.

Description

technical field [0001] The invention relates to a crystal material, in particular to a chlorine-doped photocatalytic polycrystalline material with photocatalytic activity under visible light conditions, belonging 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 ligh...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J27/10B01J27/135
Inventor 蔡伟民徐俊王正鹏
Owner SHANGHAI JIAO TONG UNIV
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