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Multi element daged-anatase type TiO2 collosol photo catalyst and its preparation method

An anatase type, photocatalyst technology, used in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problem of low particle crystallinity, unreachable photoactivity, low visible light activity, etc. problems, to achieve the effect of saving investment, high industrial output rate and good stability

Inactive Publication Date: 2007-07-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But the titania sol currently used still has the following disadvantages: 1. The titania nanoparticles in the sol are mostly amorphous structure, and the catalytic activity of this structure is low; 2. .Although the catalyst has good activity under ultraviolet light irradiation, it has low visible light activity
However, the crystallinity of TiO2 particles in the sol catalyst prepared by these methods is low, and the visible light activity is far from the expected level.

Method used

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  • Multi element daged-anatase type TiO2 collosol photo catalyst and its preparation method
  • Multi element daged-anatase type TiO2 collosol photo catalyst and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 14mL TiCl 4 Add 50mL of deionized water at 0°C, adjust the pH to 8-9 with dilute ammonia water, and produce a white precipitate. Filter and wash with deionized water until the filtrate is detected by silver nitrate and no silver chloride precipitate appears. Under the condition of stirring, add 200mL distilled water to the precipitation to obtain a titanium dioxide slurry, and adjust the pH to 1-2 with a concentration of 40% nitric acid to obtain transparent TiO 2 Aqueous sol; hydrofluoric acid is added to the sol so that the atomic ratio of F to Ti is 1:10, and the hydrothermal reaction is carried out at 80°C for 20 hours in a reactor to obtain transparent fluorine-doped anatase TiO 2 Sol. After testing, its crystallinity is 55%, and the mass content of titanium dioxide is about 5%. The sol has high stability and can maintain uniform dispersion for a long time (more than half a year) without stratification and precipitation.

[0037] Gained sol is added in the solut...

Embodiment 2

[0039] 14mL TiCl4 Add 50mL of deionized water at 0°C, adjust the pH to 8-9 with dilute ammonia water, and produce a white precipitate. Filter and wash with deionized water until the filtrate is detected by silver nitrate and no silver chloride precipitate appears. Add 100mL distilled water to the precipitation to obtain a titanium dioxide slurry, adjust the pH to 1-2 with 40% nitric acid, and degelize to obtain transparent TiO 2 Water sol; triethylamine is added to the sol so that N / Ti (atomic ratio) = 0.07, in a reaction kettle, 200 ° C hydrothermal reaction for 6 hours, to obtain transparent nitrogen-doped anatase TiO 2 The sol has a crystallinity of 37%, and the mass content of titanium dioxide is about 10%.

[0040] The catalytic activity evaluation conditions were the same as in Example 1, the solution was irradiated with a light source for 6 hours, and the degradation rate of Rhodamine B by the sol was 63% (see Table 1).

Embodiment 3

[0042] 14mL TiCl 4 Add 50mL of deionized water at 0°C, adjust the pH to 8-9 with dilute ammonia water, and produce a white precipitate. Filter and wash with deionized water until the filtrate is detected by silver nitrate and no silver chloride precipitate appears. Add 1L of distilled water to the precipitation to obtain a titanium dioxide slurry, adjust the pH to 1-2 with 40% nitric acid, and degelize to obtain transparent TiO 2 Water sol; add hydrofluoric acid and triethylamine to the sol at the same time, so that F / Ti=0.03, N / Ti=0.1 (atomic ratio), in a reaction kettle, 130 ° C hydrothermal reaction for 12 hours, to obtain transparent nitrogen doped anatase TiO 2 The sol has a crystallinity of 59%, and the mass content of titanium dioxide is about 1%.

[0043] The catalytic activity evaluation conditions are the same as those in Example 1. The solution was irradiated with a light source for 6 hours, and the degradation rate of Rhodamine B by the sol was 81% (see Table 1)...

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Abstract

A multiple elements doped anatase-type TiO2 sol photocatalyst features that its solvent is water or the mixture of water and unitary or binary alcohol, and its sol contains non-metal doped anatase-type TiO2 nanoparticles, and has a formula: TiO2-x-yAxBy, where x=0.0-0.1, y=0.0-0.1 and A or B is one or more of non-metal halogens or N-family elements. Its preparing process includes such steps as hydrolyzing organic or inorganic Ti source, doping, dispergating, and hydrothermal crystallizing.

Description

technical field [0001] The invention relates to nanomaterial preparation technology, in particular to a multi-component doped anatase TiO 2 Sol photocatalyst, specifically relates to a kind of anatase type TiO with non-metallic doping 2 The invention discloses a preparation method of a sol photocatalyst. The catalyst can undergo a photocatalytic reaction under the irradiation of ultraviolet light and visible light, and can be applied to the field of environmental protection. Background technique [0002] As an important inorganic functional material, titanium dioxide is used in many fields such as modern industry and agriculture, national defense and science and technology. Since the discovery in 1972 that titanium dioxide photocatalytically decomposed water to produce hydrogen, its photocatalytic performance has attracted people's attention. Titanium dioxide has three crystal forms: anatase, rutile and brookite, among which anatase-type titanium dioxide has higher photoca...

Claims

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Application Information

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IPC IPC(8): B01J21/06
Inventor 宋慧宇廖世军黄冬根
Owner SOUTH CHINA UNIV OF TECH
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