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Method for preparing high activity non-metallic ion co-doped titanium dioxide photochemical catalyst

A titanium dioxide and photocatalyst technology, applied in the field of photocatalysis, can solve the problems of low visible light catalytic efficiency, high cost or equipment requirements, complicated preparation method procedures, etc., and achieve enhanced visible light response, low equipment requirements, and high UV-visible photocatalysis active effect

Inactive Publication Date: 2009-06-03
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] TiO doped with metal or nonmetal ions 2 Catalyst, forming a doping energy level within the forbidden band width, extending the TiO to a certain extent 2 The range of photoresponse leads to the enhancement of visible light catalytic ability, but the UV-visible photocatalytic efficiency is still not high enough to meet the requirements of practical application, and the preparation method is complicated, difficult to operate, high in cost or equipment requirements, etc.
[0005] The present invention aims to solve key problems such as low solar energy utilization rate and low visible light catalytic efficiency of titanium dioxide photocatalyst, and has developed "highly active non-metallic ion co-doped titanium dioxide (TiO 2-x-y A x m y ) photocatalyst", and established the preparation of "highly active non-metal ion co-doped titanium dioxide (TiO 2-x-y A x m y ) photocatalyst”, and the preparation method is simple, easy to operate, low cost and equipment requirements

Method used

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  • Method for preparing high activity non-metallic ion co-doped titanium dioxide photochemical catalyst
  • Method for preparing high activity non-metallic ion co-doped titanium dioxide photochemical catalyst
  • Method for preparing high activity non-metallic ion co-doped titanium dioxide photochemical catalyst

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preparation example Construction

[0016] (1) TiO 2 -Preparation of pure catalyst

[0017] Preparation steps and TiO 2-x-y A x m y Similar, except that no non-metallic compound is added, and in step ②, after adding an acidic catalyst to the system, add a quantitative amount of high-purity water (18.2MΩ·cm -1 ).

[0018] (2)TiO 2 Preparation of -N catalyst

[0019] Preparation steps and TiO 2-x-y A x m y Similar, except that non-metallic compounds are not added in step ①, and a certain amount of nitrogen-containing compounds are added in step ③.

[0020] (3) TiO 2 Preparation of -B catalyst

[0021] Preparation steps and TiO 2-x-y A x m y Similar, only a certain amount of boron-containing compounds are added in step ①, and non-metallic compounds are not added in step ③.

[0022] 3. In the above preparation process, the addition amount of various reactants is:

[0023] The molar ratio of non-metallic compound to titanate or titanate is 1:20-10:1;

[0024] The volume ratio of diluent to titanate o...

Embodiment 1

[0044] At room temperature, measure 40ml of absolute ethanol and place it on a magnetic stirrer, measure 2ml of tetraethyl orthosilicate (8.65×10 -3 mol) was added absolute ethanol, fully stirred for 15 minutes to completely dissolve it; added 1ml hydrochloric acid (analytical pure); slowly dripped 12ml concentration of 98% tetrabutyl titanate (3.46 × 10 -2 mol), stirred evenly for 15 minutes; adding 3ml of ammonia water (0.04mol) with a concentration of 25%, stirred vigorously and uniformly at room temperature for 6-12 hours, left to stand and aged for 1-5 days, and obtained a precipitate; the precipitate Place it in an oven at 100°C for 10 hours to evaporate the solvent, grind it into powder with an agate mortar, put it into a crucible and calcinate it in an air atmosphere at 450°C in a muffle furnace for 2.5 hours to obtain nano-scale double non-metallic elements silicon and nitrogen. Doped TiO 2 catalyst of light.

Embodiment 2

[0046] At room temperature, measure 40ml of absolute ethanol and place it on a magnetic stirrer, weigh 1.39g bromine simple substance (8.65×10 -3 mol) was added absolute ethanol, fully stirred for 15 minutes to completely dissolve it; added 1ml hydrochloric acid (analytical pure); slowly dripped 12ml concentration of 98% tetrabutyl titanate (3.46 × 10 -2 mol), stirred evenly for 15 minutes; added 3.05g thiourea (0.04mol), stirred vigorously and uniformly at room temperature for 6-12 hours, left to age for 1-5 days, and obtained a precipitate; the precipitate was placed in an oven Bake at 100°C for 10 hours to evaporate the solvent, grind it into powder with an agate mortar, put it into a crucible and calcinate in the air atmosphere of 450°C in a muffle furnace for 2.5 hours to obtain nano-scale double non-metal element bromine and sulfur co-doped TiO 2 catalyst of light.

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Abstract

In order to degrade the pollutants in water and atmosphere by the photocatalysis technology, the invention discloses a method for preparing a high activity non-metallic ion co-doped titanium dioxide photochemical catalyst. In the photochemical catalyst, titanium ester or titanate is used as a precursor, non-metallic compound comprising boron, carbon, nitrogen, fluorin, silicon, phosphor, sulfur, chlorine, bromine, iodine, and the like, are used as doping agents, the high activity non-metallic ion co-doped titanium dioxide photochemical catalyst is prepared by adopting the sol gel method. Compared with a titanium dioxide photochemical catalyst single-doped with pure titanium dioxide and the non-metallic irons, the visible light catalytic activity of the titanium dioxide photochemical catalyst on the degradation of parachlorophenol is greatly improved, and the ultraviolet light catalytic activity can also exceed the catalytic activity of the pure titanium dioxide catalyst. The method also has the advantages that the preparation technique is simple, the equipment requirement is low; the particle diameter of the product is small, the specific surface is relatively high, the dispersivity is good, thus having a wide application prospect in the environmental cleaning scientific field.

Description

【Technical field】 [0001] The invention belongs to the field of photocatalysis technology, is mainly used in environmental purification, and provides a method for preparing a highly active titanium dioxide photocatalyst co-doped with two non-metallic elements for degrading pollutants in water and the atmosphere by using photocatalysis technology . 【Background technique】 [0002] The energy crisis and environmental degradation in today's world force people to look for cleaner, renewable new energy sources and new methods of governing the environment. Titanium dioxide has the characteristics of good stability, high photoelectric conversion efficiency and photocatalytic activity. It can not only degrade organic pollutants and remove transition metal ions non-selectively as a photocatalyst, but also is a photoconductive material for surface-sensitized solar cells. It can be used in environmental governance and cleaning. The field of energy research has broad application prospect...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J27/24B01J27/14B01J27/135A62D3/17A62D101/20
Inventor 曹亚安袁继翔王恩君龙绘锦
Owner NANKAI UNIV
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