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Non-metallic element multiple doping nano titanium dioxide photocatalyst and preparation method

A nano-titanium dioxide, non-metallic element technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low doping amount, achieve simple system, good reproducibility, process easy-to-control effects

Inactive Publication Date: 2009-10-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large dopant source molecule used and the low doping amount of nitrogen and sulfur, the product is used for the degradation of NO, and the photocatalytic efficiency of 25min is only 25%.

Method used

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  • Non-metallic element multiple doping nano titanium dioxide photocatalyst and preparation method
  • Non-metallic element multiple doping nano titanium dioxide photocatalyst and preparation method
  • Non-metallic element multiple doping nano titanium dioxide photocatalyst and preparation method

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Experimental program
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Effect test

Embodiment 1

[0030]Weigh industrial metatitanic acid according to the molar ratio of acid titanium 2.8:1, add concentrated sulfuric acid, and heat and stir until dissolved; add water to dilute the obtained solution to a titanium concentration of 0.1mol / L, then add activated carbon for adsorption, filter, Dilute the filtrate to a titanium concentration of 0.025 mol / L, then add 2.5 times the precipitating agent urea based on the mole of metatitanic acid, and heat to 80°C for precipitation for 10 hours, then age at room temperature for 15 hours, and the precipitate separated, filtered, washed until neutral, and dried to obtain TiO(OH) 2 Powder; mix the obtained powder with thiourea at a mass ratio of titanium to nitrogen of 1:1.5, then calcinate at 500°C for 1.5 hours, cool and grind to obtain a light yellow non-metal element multi-component doped nanometer with an average particle size of 18.54nm. Titanium dioxide powder. The powder is analyzed by XPS energy spectrum to calculate that N is ...

Embodiment 2

[0032] Weigh industrial metatitanic acid according to the molar ratio of acid titanium 3:1, add concentrated sulfuric acid, and heat and stir until dissolved; add water to dilute the obtained solution to a titanium concentration of 0.3mol / L, then add activated carbon for adsorption, filter, Dilute the filtrate to a titanium concentration of 0.075 mol / L, then add 3 times the precipitating agent urea based on the mole of metatitanic acid, and heat to 100°C for precipitation for 8 hours, then age at room temperature for 13 hours, and the precipitate separated, filtered, washed until neutral, and dried to obtain TiO(OH) 2 Powder: mix the obtained powder with thiourea according to the mass ratio of titanium and nitrogen of 1:3, then calcinate at 450°C for 2 hours, and grind after cooling to obtain non-metal element multi-doped nano-titanium dioxide powder with an average particle size of 14.6nm body. The powder is analyzed by XPS energy spectrum to calculate that N is 10.64%, S is...

Embodiment 3

[0034] Weigh industrial metatitanic acid according to the molar ratio of acid titanium 3.5:1, add concentrated sulfuric acid, and heat and stir until dissolved; add water to dilute the obtained solution to a titanium concentration of 0.2mol / L, then add activated carbon for adsorption, filter, Dilute the filtrate to a titanium concentration of 0.05 mol / L, then add 3.5 times the precipitating agent urea based on the mole of metatitanic acid, and heat to 90°C for precipitation for 9 hours, then age at room temperature for 14 hours, and the precipitate separated, filtered, washed until neutral, and dried to obtain TiO(OH) 2 Powder: the obtained powder is uniformly mixed with thiourea according to the mass ratio of titanium to nitrogen of 1:2.5, then calcined at 400°C for 2 hours, cooled and ground to obtain non-metallic element multi-doped nano-titanium dioxide powder with an average particle size of 17.57nm body. The powder is analyzed by XPS energy spectrum to calculate that N ...

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Abstract

The invention discloses a non-metallic element multiple doping nano titanium dioxide photocatalyst and a preparation method. The content of non-metallic element that is doped in the catalyst is counted by weight percentage, 30-50% of carbon, 8-30% of nitrogen and 1-2% of sulfur. 100mg / L of methylene blue dye solution is added into 2g / L of the catalyst, and then degradation lasts for 2 hours under UV light, visible light or sunlight, and the degradation ratio is above 95%. The invention also discloses the preparation method for the photocatalyst. The photocatalyst provided by the invention includes high impurity content in the doping non-metallic element, therefore the photocatalyst can well respond to UV light, visible light or sunlight to rapidly degrade the dye in the dye solution, and the cost is low. In addition, the invention has advantages of simple preparation method, easily-controlled process, safe operation and good repeatability.

Description

technical field [0001] The invention belongs to the technical field of non-metal element multi-doped nano-titanium dioxide photocatalyst and its preparation, and specifically relates to a non-metal element multi-doped nano-titanium dioxide photocatalyst prepared by using industrial metatitanic acid as a raw material and a preparation method thereof. The catalyst provided by the invention can be used for the degradation of dyes in industrial wastewater, the photocatalytic degradation of indoor volatile organic gases, and the like. Background technique [0002] The removal and degradation of pollutants using photocatalysis is one of the most active research areas at present. As a wide-bandgap semiconductor, titanium dioxide is stable, cheap, non-toxic, and has high catalytic activity under the action of ultraviolet light, so it is widely used in air purification, degradation of water pollutants, antibacterial, deodorizing and self-cleaning. etc. have been widely applied. How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/02B01J27/00B01J21/06B01J37/00B01J37/03A62D3/176A62D3/17C02F1/30A61L9/18A62D101/28A62D101/26C02F101/38C02F101/34
Inventor 施亦东郭琼胡汉江陈衍夏
Owner SICHUAN UNIV
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