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Method for preparing visible light responding TiO2 mixed crystal using bergmeal as substrate

A diatomite and visible light technology, applied in the fields of photocatalysis and material chemistry, can solve the problems of easy coagulation, difficult separation and recovery of suspension systems, and no application in production practice.

Inactive Publication Date: 2009-03-04
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, conventional TiO 2 Photocatalysts are mainly used in powder dispersion suspension systems, and suspension systems have disadvantages such as difficult separation and recovery, and easy aggregation.
Poor reproducibility and high operating costs, so it is limited to laboratory research and has not been applied to production practice

Method used

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  • Method for preparing visible light responding TiO2 mixed crystal using bergmeal as substrate
  • Method for preparing visible light responding TiO2 mixed crystal using bergmeal as substrate
  • Method for preparing visible light responding TiO2 mixed crystal using bergmeal as substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Slowly add 10ml of titanium tetrachloride dropwise into the ice bath, control the drop rate to 40 drops / min, stir at a speed of 2000 rpm for 2 hours after all the drops are completed, adjust the pH value at 7.0 with ammonia water, and obtain White precipitate, continue to stir for 3 hours, filter and wash the precipitate until there is no chloride ion, dissolve it in water, add 10ml of hydrogen peroxide, stir for 2 hours, add 0.1g of sodium phosphate and 0.1g of carboxymethyl cellulose It is placed in a reaction kettle at 100°C for 6 hours, and then taken out for later use.

[0020] 2. Diatomaceous earth is activated at 450°C for 2 hours, then poured into 5% dilute hydrochloric acid and stirred for 5 hours, then taken out and dried.

[0021] 3. Mix and stir the prepared titanium dioxide and activated diatomaceous earth, dry and bake at 550° C. for 5 hours to obtain the target diatomite-based mixed crystal titanium dioxide powder with visible light activity.

Embodiment 2

[0023] 1. Slowly add 10ml of titanium tetrachloride dropwise into an ice bath, control the drop rate to 20 drops / min, stir at a speed of 2000 rpm for 3 hours after all the drops are completed, adjust the pH value at 5.0 with ammonia water, and obtain White precipitate, continue to stir for 3 hours, filter and wash the precipitate to no chloride ion, dissolve in water, add 20ml of hydrogen peroxide, stir for 2 hours, add 0.05g of sodium phosphate and 0.05g of carboxymethyl cellulose It is placed in a reaction kettle at 150°C for 4 hours, and then taken out for later use.

[0024] 2. Diatomaceous earth is activated at 600°C for 5 hours, then poured into 1% dilute hydrochloric acid and stirred for 10 hours, then taken out and dried.

[0025] 3. Mix and stir the prepared titanium dioxide and activated diatomaceous earth, dry and bake at 450° C. for 8 hours to obtain the target diatomite-based mixed crystal titanium dioxide powder with visible light activity.

Embodiment 3

[0027] 1. Slowly add 10ml of titanium tetrachloride dropwise into an ice bath, control the drop rate at 50 drops / min, stir at a speed of 2000 rpm for 5 hours after all the drops are completed, adjust its pH value at 9.0 with ammonia water, and obtain White precipitate, continue to stir for 3 hours, filter, wash the precipitate to no chloride ion, add 15ml of hydrogen peroxide to it after dissolving in water, stir for 2 hours, add 0.02g of sodium phosphate and 0.02g of carboxymethyl cellulose It is placed in a reaction kettle at 80°C for 12 hours, and then taken out for later use.

[0028] 2. Diatomite is activated at 800°C for 1 hour, then poured into 10% dilute hydrochloric acid and stirred for 2 hours, then taken out and dried.

[0029] 3. Mix and stir the prepared titanium dioxide and activated diatomaceous earth, dry and bake at 600° C. for 2 hours to obtain the target diatomite-based mixed crystal titanium dioxide powder with visible light activity.

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Abstract

A preparation method for visible light responding TiO2 mixed crystal which utilizes diatomite as a basal body and relates to photocatalysis and material chemistry technical field. The method comprises the steps of: 1. preparing titanium dioxide mixed crystal; 2. activating diatomite; 3. loading the prepared titanium dioxide mixed crystal on the activated diatomite, and preparing titanium dioxide compound photocatalyst which has diatomite as the basal body and is visible light responding. The catalyst produced by adopting the preparation method of the invention has high specific surface area, and has fair degradation efficiency to organisms in practical agricultural chemicals and waste water under visible light irradiation as to Degussa P25 under ultraviolet light irradiation. Furthermore, the catalyst can be recycled and has high repeating using efficiency.

Description

technical field [0001] The invention relates to the technical field of photocatalysis and material chemistry, in particular to a visible light-responsive TiO2 based on diatomite. 2 Preparation methods of mixed crystals. Background technique [0002] As people's awareness of environmental protection is becoming stronger, it has become a major trend to develop materials or green products that can be combined with natural resources to reduce the degree of damage to the environment and improve the quality of life. Among these numerous materials, photocatalyst is one of the important development directions. [0003] Photocatalysis is a new environmental treatment technology and new energy technology with broad application prospects. It has outstanding advantages such as low energy consumption, easy operation, and no secondary pollution. In these studies, titanium dioxide has become the focus of research due to its strong redox ability, high chemical stability and non-toxic pro...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J37/00
Inventor 谢吉民李泽方吕晓萌吕平罗志会
Owner JIANGSU UNIV
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