Preparation method of kieselguhr load type compound photocatalyst with iron ions doped titanium dioxide

A technology of titanium dioxide and diatomaceous earth, applied in catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problem of low utilization efficiency of sunlight and achieve the treatment effect Improved, effective, low-cost effects

Inactive Publication Date: 2011-08-17
ZHEJIANG SCI-TECH UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

For example, Song Haiyan from the University of Science and Technology of China has disclosed a method for preparing a composite photocatalyst using n-butyl titanate as a raw material and using diatomaceous earth as a carrier; however, the energy band limitation of titanium dioxide itself has a low utilization efficiency of sunlight , which has become an urgent problem to be solved in the application of titanium dioxide photocatalyst
There is no report on the method of preparing composite photocatalysts by doping titanium dioxide with iron ions and diatomite to exert the synergistic effect of the two and improve the photoresponse range of titanium dioxide.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1, a kind of preparation method of diatomite-loaded iron ion-doped titanium dioxide composite photocatalyst, carries out the following steps successively:

[0018] 1) Mix 10g of titanium tetrachloride with 15ml of polyethylene glycol, add 1g of diatomaceous earth, and stir for 10min to form a slurry;

[0019] 2) Dissolving 0.0005 g of ferric nitrate in 1 g of deionized water to prepare a ferric nitrate solution.

[0020] In a water bath at 10°C, the above-mentioned ferric nitrate solution was added dropwise to the above-mentioned mud, and stirred for 60 minutes to hydrolyze the titanium tetrachloride in the mud to generate titanium dioxide; Sol; in the reaction process, hydrolysis is suppressed by adding glacial acetic acid, thereby controlling the pH of the reaction system to be 4.9.

[0021] 3), aging the sol at room temperature for 1 hour to obtain a xerogel;

[0022] 4) The dry gel is baked at 300° C. for 4 hours to obtain a diatomite-supported iron ion...

Embodiment 2

[0024] Embodiment 2, a kind of preparation method of diatomite-loaded iron ion-doped titanium dioxide composite photocatalyst, carries out the following steps successively:

[0025] 1) Mix 10g of n-butyl titanate with 40ml of absolute ethanol, add 3g of diatomaceous earth, and stir for 20min to form a slurry;

[0026] 2) Dissolve 0.005g of ferric sulfate in 1.5g of deionized water to prepare a ferric sulfate solution.

[0027] In a water bath at 20°C, add the above-mentioned iron sulfate solution dropwise into the above-mentioned mud, and stir for 50 minutes to hydrolyze the n-butyl titanate in the mud to generate titanium dioxide; after the hydrolysis reaction (the hydrolysis reaction time is 50 minutes), A sol was obtained; during the reaction, the hydrolysis was suppressed by adding hydrochloric acid, thereby controlling the pH of the reaction system to be 3.

[0028] 3), aging the sol at room temperature for 12 hours to obtain a gel;

[0029] 4) The gel was baked at a hi...

Embodiment 3

[0031] Embodiment 3, a kind of preparation method of diatomite-loaded iron ion-doped titanium dioxide composite photocatalyst, carries out the following steps successively:

[0032] 1) Mix 10g of titanium sulfate with 30ml of isopropanol, add 5g of diatomaceous earth, and stir for 30min to form a slurry;

[0033] 2), 0.03g ferric nitrate is dissolved in 2g deionized water, is mixed with ferric nitrate solution.

[0034] In a water bath at 45°C, add the above-mentioned ferric nitrate solution dropwise into the above-mentioned mud, and after stirring for 40 minutes, the titanium sulfate in the mud is hydrolyzed to generate titanium dioxide; after the hydrolysis reaction (the hydrolysis reaction time is 40 minutes), the sol is obtained ; During the reaction, hydrolysis is suppressed by adding nitric acid, thereby controlling the pH of the reaction system to be 2.5.

[0035] 3), aging the sol at room temperature for 24 hours to obtain a gel;

[0036] 4) The gel was baked at a hi...

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Abstract

The invention discloses a preparation method of a kieselguhr load type compound photocatalyst with iron ions doped with titanium dioxide, comprising the following steps: (1) mixing titanic acid esters or titanium salt with an alcoholic solvent, and then adding kieselguhr into the alcoholic solvent and stirring so as to form slurry; (2) dissolving iron salt into water to form an iron salt solution, and in a water bath with the temperature of 10-95 DEG C, dropping the iron salt solution into the slurry and stirring so that the titanic acid esters or the titanium salt inside the slurry is hydrolyzed to obtain colloidal sols; (3) aging the colloidal sols under room temperature to obtain dried gel; and (4) baking the dried gel for 0.5-5 hours under the temperature of 200-800 DEG C to obtain the kieselguhr load type compound photocatalyst with the iron ions doped with the titanium dioxide. The compound photocatalyst prepared by the method can effectively process waste water.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for preparing a diatomite-supported iron ion-doped titanium dioxide composite photocatalyst. Background technique [0002] Wastewater from textile printing and dyeing, leather or papermaking industries has a large amount of water, high chroma, high content of organic pollutants, and complex components. In recent years, due to the use of PVA slurry and new additives, organic pollutants that are difficult to biodegrade content increased significantly. It is difficult and costly to treat with a single agent or process; therefore, it is necessary to develop efficient and economical wastewater treatment agents based on the combination of different agents. Diatomite is a non-metallic mineral formed by the continuous deposition of the remains of diatoms growing in oceans or lakes. It has unique pore structure, large specific surface area, strong adsorption, rich r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J21/06B01J37/00B01J37/08B01J20/14C02F1/30C02F103/30C02F103/28C02F103/24
Inventor 孙冲林俊雄汪澜
Owner ZHEJIANG SCI-TECH UNIV
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