Preparation method of TiO2/SiO2/NiFe2O4 magnetic composite photocatalyst

A photocatalyst and composite magnetic technology, which is applied in the field of magnetic photocatalyst material preparation, can solve the problems of reduced photocatalyst activity, lower catalyst specific surface area and mass transfer rate, and achieve the effects of reduced adverse effects, stable properties, and reduced costs

Inactive Publication Date: 2012-05-02
SHANGHAI UNIV
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Problems solved by technology

However, the recovery problem of the catalyst in the suspension system limits its application. Many people try to fix the photocatalyst on a carrier such as glass beads, glass fibers, zeolite, etc. to prepare a

Method used

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  • Preparation method of TiO2/SiO2/NiFe2O4 magnetic composite photocatalyst
  • Preparation method of TiO2/SiO2/NiFe2O4 magnetic composite photocatalyst

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Embodiment

[0021] Concrete steps in the present embodiment are as follows:

[0022] (1) Preparation of NiFe 2 o 4 : Accurately weigh 3.243g FeCl 3 ·6H 2 O and 1.745g Ni (NO 3 ) 2 ·6H 2 O, dissolve in 80ml of distilled water, add 4ml of 1mol / L hydrazine hydrate solution, and stir evenly. Then adjust the pH value of the mixed solution to about 10 with 5 mol / L sodium hydroxide solution to form a suspension. The suspension was transferred to a 150ml autoclave, the lid was tightened, and placed in a blast drying oven at 180°C for hydrothermal reaction for 8 hours. After the reaction, the autoclave was taken out, cooled rapidly, and then the product was transferred to a 500ml beaker, washed with distilled water until neutral, filtered with suction, and then dried in an air-blast drying oven at 80°C for 3 hours, and ground to obtain Magnetic NiFe 2 o 4 powder.

[0023] (2), preparation of SiO 2 / NiFe 2 o 4 : Accurately weigh 0.56g of nickel ferrite powder and add it to 20ml of ...

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Abstract

The invention relates to a preparation method of a TiO2/SiO2/NiFe2O4 magnetic composite photocatalyst. The method is mainly characterized in that a hydrothermal method is utilized to prepare magnetic nickel ferrite particles, a hydrolytic precipitation method is utilized to coat a silicon dioxide layer outside the nickel ferrite particles, and a sol-gel method is utilized to deposit TiO2 on the SiO2/NiFe2O4 surface by using SiO2/NiFe2O4 as a magnetic core and tetrabutyl titanate as a precursor. The invention has the following advantages: the particles of the material are small, and TiO2 and NiFe2O4 are isolated by the silicon dioxide; and thus, the photocatalysis performance of the titanium dioxide is not influenced by the nickel ferrite, and the titanium dioxide can be effectively recycled through an external magnetic field. In addition, the magnetic substance used in the method is nickel ferrite with stable properties, and the magnetic performance of the nickel ferrite can not be influenced by high-temperature calcination.

Description

technical field [0001] The present invention relates to a kind of TiO 2 / SiO 2 / NiFe 2 o 4 The preparation of a magnetic composite photocatalyst belongs to the technical field of preparation of magnetic photocatalyst materials. Background technique [0002] Photocatalysis is a potential water treatment technology, which has obvious advantages compared with traditional water treatment technologies, such as: strong processing capacity, mild reaction conditions, no secondary pollution, etc. However, the recovery problem of the catalyst in the suspension system limits its application. Many people try to fix the photocatalyst on a carrier such as glass beads, glass fibers, zeolite, etc. to prepare a fixed composite photocatalyst, or a photocatalyst film, but this The method reduces the specific surface area and mass transfer rate of the catalyst, which significantly reduces the activity of the photocatalyst. In recent years, some people have combined photocatalysts with ma...

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Application Information

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IPC IPC(8): B01J23/755
Inventor 严丽君程跃葛潭潭闫潇娟
Owner SHANGHAI UNIV
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