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Inorganic sensitized visible-light responsive photocatalyst and preparation method thereof

A photocatalyst and visible light technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of less than 5% utilization rate of light energy, low utilization rate of light energy, etc. The effect of stable visible light activity, low cost and simple manufacturing process

Inactive Publication Date: 2009-08-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] TiO 2 The main problem in the practical application of base photocatalytic materials is: TiO 2 The forbidden band is wide (3.0~3.2eV), the light energy utilization rate is low, the absorption of sunlight is limited to the ultraviolet region, and the light energy utilization rate is less than 5%.

Method used

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  • Inorganic sensitized visible-light responsive photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0019] a. Add 0.005mol of nickel nitrate hexahydrate, 0.002mol of titanium tetrachloride and 0.1mol of urea into 100mL of deionized water, and stir until uniform;

[0020] b. Transfer solution a into a 250mL three-necked flask, and react for 10h under stirring and reflux conditions;

[0021] c. After the reaction, the product is suction filtered, washed with deionized water to pH 7, and the filter cake is dried in an oven at 60°C to obtain precursor powder.

[0022] d. Put the precursor powder into a porcelain crucible, heat it in a muffle furnace from room temperature to 500°C, keep it for 4 hours, and naturally drop to room temperature to obtain nickel oxide sensitized nitrogen-doped titanium dioxide photocatalyst (NiO-N-TiO 2 ).

Embodiment 2

[0024] a. Add 0.005mol of nickel nitrate hexahydrate, 0.002mol of titanium tetrachloride and 0.1mol of urea into 100mL of deionized water, and stir until uniform;

[0025] b. Transfer solution a to a 250mL three-necked flask, and react for 2h under stirring and reflux conditions;

[0026] c. After the reaction is over, the product is suction filtered and washed with deionized water to pH 8;

[0027] d. Stir the filter cake with 100mL 0.008mol sodium carbonate to form a suspension;

[0028] e. Transfer the above suspension to a 200mL high temperature and high pressure hydrothermal kettle, and place it in a 100°C oven for 10 hours;

[0029] f. After the reaction, the product is suction filtered, washed with deionized water to pH 7, and the filter cake is dried in an oven at 60°C to obtain precursor powder.

[0030] g. Put the precursor powder into a porcelain crucible, heat it in a muffle furnace from room temperature to 500°C, keep it for 4 hours, and naturally cool to room tempera...

Embodiment 3

[0032] a. Add 0.0025mol nickel nitrate hexahydrate, 0.0025mol zinc nitrate hexahydrate, 0.002mol titanium tetrachloride and 0.1mol urea into 100mL deionized water and stir until uniform;

[0033] b. Transfer solution a into a 250mL three-necked flask, and react for 10h under stirring and reflux conditions;

[0034] c. After the reaction, the product is suction filtered, washed with deionized water to pH 7, and the filter cake is dried in an oven at 60°C to obtain precursor powder.

[0035] d. Put the precursor powder into a porcelain crucible, heat it in a muffle furnace from room temperature to 500°C, keep it for 4 hours, and naturally drop to room temperature to obtain nickel oxide-sensitized zinc oxide and nitrogen-doped titanium dioxide photocatalyst (NiO-ZnO and NiO-N-TiO 2 ).

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Abstract

The invention relates to an inorganic sensitized photo catalyst and a preparation method thereof, and belongs to the technical field of photo catalysts. The catalyst consists of two or three nano metal oxides, wherein one or two metal oxides are photocatalysis active species, and the other one or two metal oxides are photosensitizers. The photocatalysis active species are titanium dioxide, nitrogen-doped titanium dioxide, boron-doped titanium dioxide, phosphor-doped titanium dioxide and zinc oxide; and the photosensitizers are nickel oxide, dichromium trioxide and ferric oxide. The composition and content of the catalyst can be adjusted by a quantity ratio of precursor element substances. The catalyst of the invention is applicable to visible light decomposition and purification treatment of organic pollutants in air and water; and the preparing process is simple, the cost is lower, and the catalyst promotes photo-catalyzed reaction to be further practical.

Description

Technical field [0001] The invention belongs to the technical field of photocatalysts, and particularly relates to an inorganic sensitized photocatalyst and a preparation method thereof. The catalyst can be activated in the visible light range to catalyze and degrade organic substances. Background technique [0002] Photocatalytic technology is a hot spot in scientific research today, and its application range is very wide, such as sewage treatment, air purification, solar energy utilization, antibacterial, anti-fog and self-cleaning functions. The materials currently used as photocatalysts are mainly semiconductor compounds. TiO is common 2 , ZnO, WO 3 , SnO 2 Other oxides, sulfides such as CdS and ZnS, and selenides such as CdSe. Of which TiO 2 Because of its non-toxic, high catalytic activity, strong oxidation ability, and good stability, it has become the most commonly used photocatalyst and is a very promising material for pollution control. [0003] TiO 2 The main problem i...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J21/02B01J27/14B01J27/24B01J37/04B01J37/03B01J37/08C02F1/00A62D3/00A62D101/20
CPCY02A50/20Y02W10/37
Inventor 何静舒心
Owner BEIJING UNIV OF CHEM TECH
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