TiO2 catalyst with large specific surface area and visible-light response function and method for preparing TiO2 catalyst

A technology with large specific surface area and visible light, applied in the field of photocatalysis, can solve problems such as low quantum efficiency, achieve good visible light photocatalytic performance, and improve the effect of visible light photocatalytic performance

Active Publication Date: 2015-12-30
FUZHOU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

But due to TiO 2 The forbidden band width is wide and can only be excited by ultraviolet light, while the energy of ultraviolet light in sunlight is less than 5% of the total energy, while visible light with lower energy accounts for most of the total energy, and the quantum efficiency is low

Method used

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  • TiO2 catalyst with large specific surface area and visible-light response function and method for preparing TiO2 catalyst
  • TiO2 catalyst with large specific surface area and visible-light response function and method for preparing TiO2 catalyst
  • TiO2 catalyst with large specific surface area and visible-light response function and method for preparing TiO2 catalyst

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preparation example Construction

[0025] A Large Specific Surface Area-Visible Light Responsive TiO 2 The preparation method of catalyst, concrete steps are:

[0026] (1) MIL-125(Ti)-NH 2 The preparation method is as follows: Weigh 2-aminoterephthalic acid (1.2g) and disperse it in 36mL N,N-dimethylformamide (DMF) and anhydrous methanol (4mL), stir for 30min until the solute is fully dissolved and dispersed, Then use a pipette gun to pipette tetrabutyl titanate (1.2mL) into the reaction kettle, continue to stir for 30 minutes, put the kettle in a 150°C oven for 72 hours, cool naturally, exchange and wash with anhydrous methanol several times, and centrifuge. Then place the obtained sample in a vacuum oven at 60°C to dry, and the obtained yellow sample is MIL-125(Ti)-NH 2 ;

[0027] (2) With the synthesized MIL-125(Ti)-NH 2 As the precursor, weigh a certain amount of the precursor in the middle of the quartz tube of the tube furnace, and continue to pass nitrogen and oxygen, and calcined to a certain temper...

Embodiment 1

[0029] 1) Weigh 2-aminoterephthalic acid (1.2g) and disperse it in N,N-dimethylformamide (DMF) (36mL) and anhydrous methanol (4mL), stir for 30min until the solute is fully dissolved and dispersed, Then use a pipette gun to pipette tetrabutyl titanate (1.2mL) into the reaction kettle, continue to stir for 30 minutes, put the kettle in a 150°C oven for 72 hours, cool naturally, exchange and wash with anhydrous methanol several times, and centrifuge. Then place the obtained sample in a vacuum oven at 60°C to dry, and the obtained yellow sample is MIL-125(Ti)-NH 2 ;

[0030] 2) Place the obtained sample in the middle of the quartz tube of the tube furnace for calcination, continuously pass nitrogen and oxygen, the nitrogen flow rate is 50ml / min, the oxygen flow rate is 5ml / min, the calcination temperature is 500°C, and the heating rate is 1°C per minute. The constant temperature holding time is 3 hours, and the calcined product is cooled with the furnace at a rate of 3°C per min...

Embodiment 2

[0032] 1) Weigh 2-aminoterephthalic acid (1.2g) and disperse it in DMF (36mL) and anhydrous methanol (4mL), stir for 30min until the solute is fully dissolved and dispersed, then pipette tetrabutyl titanate with a pipette gun Put the ester (1.2mL) into the reaction kettle, continue to stir for 30min, place it in a 150°C oven to react for 72h, cool naturally, wash with anhydrous methanol several times, centrifuge, and then place the obtained sample in a 60°C vacuum oven to dry dry, the resulting yellow sample is MIL-125(Ti)-NH 2 ;

[0033]2) Place the obtained sample in the middle of the quartz tube of the tube furnace for calcination, continuously pass nitrogen and oxygen, the nitrogen flow rate is 50ml / min, the oxygen flow rate is 10ml / min, the calcination temperature is 550°C, and the heating rate is 1°C per minute. The constant temperature holding time is 3 hours, and the calcined product is cooled with the furnace at a rate of 3°C per minute, and cooled to room temperatur...

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Abstract

The invention provides a TiO2 catalyst with a large specific surface area and a visible-light response function and a method for preparing the TiO2 catalyst, and belongs to the technical field of photocatalysis. Ti-MOF (MIL-125 (Ti)-NH2) which is used as a self-template is sintered and synthesized in atmosphere of oxygen and hydrogen with a certain proportion (of oxygen to hydrogen of 1:5-1:10) to obtain the catalyst which is a TiO2 polyhedron with auto-doped N and a large specific surface area. The TiO2 catalyst and the method have the advantages that morphology of MOF can be effectively copied by the aid of the template method, and the specific surface area of TiO2 can be greatly increased by microporous structures and can reach 262.3 m<2> / g; MOF ligands are regulated and controlled, N, F and S elements are doped in the TiO2, and accordingly the visible-light photocatalyst performance of the TiO2 can be improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis in the energy environment, and in particular relates to a large specific surface area-visible light response TiO 2 Catalyst and method for its preparation. Background technique [0002] Environmental and energy issues are two major issues restricting the development of today's society. Semiconductor photocatalysis technology uses solar energy as the driving force of the reaction to effectively reduce energy consumption, and because of its mild reaction conditions and no secondary pollution, it has become the solution to these two issues. Ideal way. The core of photocatalytic technology lies in photocatalyst. Among various materials, nano-TiO 2 Due to its low cost, non-toxicity, high stability, good catalytic performance and recyclable utilization, it has attracted widespread attention. But since TiO 2 The forbidden band width is wide and can only be excited by ultraviolet light, while ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10C02F1/30C02F1/58C01B3/04
CPCY02E60/36
Inventor 吴棱黄林娟沈丽娟秦娜熊锦华
Owner FUZHOU UNIV
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