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

A technology of titanium dioxide and diatomite, which is applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve the problem of low utilization efficiency of sunlight and achieve the treatment effect Improve the effect of small dosage and low price

Inactive Publication Date: 2010-01-20
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • 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] Example 1. A method for preparing diatomite-supported iron ion-doped titanium dioxide composite photocatalyst, followed by the following steps:

[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) Dissolve 0.0005 g of ferric nitrate in 1 g of deionized water to prepare a ferric nitrate solution.

[0020] In a 10°C water bath, add the above ferric nitrate solution dropwise to the above slurry, stir for 60 minutes to hydrolyze the titanium tetrachloride in the slurry, thereby generating titanium dioxide; after the hydrolysis reaction (hydrolysis reaction time is 60 minutes), the obtained Sol; In the reaction process, by adding glacial acetic acid to inhibit hydrolysis, thereby controlling the pH of the reaction system to 4.9.

[0021] 3). The sol is aged for 1 hour at room temperature to obtain a dry gel;

[0022] 4) The dry gel is baked at a high temperature of 300°C for 4 ho...

Embodiment 2

[0024] Example 2. A method for preparing diatomite-supported iron ion-doped titanium dioxide composite photocatalyst, followed by the following steps:

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

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

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

[0028] 3) The sol is aged for 12 hours at room temperature to obtain a gel;

[0029] 4) The gel was baked at a high temperature of 400°C for 3 hours to obtain a diatomite-support...

Embodiment 3

[0031] Example 3. A method for preparing diatomite-supported iron ion-doped titanium dioxide composite photocatalyst, followed by the following steps:

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

[0033] 2) Dissolve 0.03 g of ferric nitrate in 2 g of deionized water to prepare a ferric nitrate solution.

[0034] In a 45℃ water bath, add the ferric nitrate solution dropwise to the slurry. After stirring for 40 minutes, the titanium sulfate in the slurry is hydrolyzed to generate titanium dioxide; after the hydrolysis reaction (hydrolysis reaction time is 40 minutes), the sol is obtained ; During the reaction process, by adding nitric acid to inhibit hydrolysis, thereby controlling the pH of the reaction system to 2.5.

[0035] 3) The sol is aged for 24 hours at room temperature to obtain a gel;

[0036] 4) The gel is baked at a high temperature of 500°C for 2 hours to obtain a diatomite-support...

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PUM

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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 preparation method of 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 in the wastewater The content in it has greatly increased. 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 on the basis of combining different agents. Diatomaceous earth is a non-metallic mineral formed by the continuous deposition of the remains of diatom organisms growing in the ocean or lake. It has the characteristics of unique pore st...

Claims

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Application Information

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