Process for preparing composite photocatalyst capable of magnetic separating

A composite light and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as loss of meaning, unstable crystal phase, instability, etc. High catalytic activity and strong binding effect

Inactive Publication Date: 2006-01-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the magnetic particles involved in this patent are Fe 3 o 4 and γ-Fe 2 o 3 , using these two magnetic particles as a carrier has the following disadvantages: (1) Fe at the nanoscale 3 o 4 Very unstable, it will be rapidly oxidized when exposed to air, so that the photocatalyst cannot be separated by an external magnetic field, and loses its meaning; (2) γ-Fe 2 o 3 The crystal phase is unstable, and when the temperature exceeds 400 ° C, it will rapidly change into non-magnetic α-Fe 2 o 3 , while TiO usually prepared at low temperature 2 They are all amorphous and have no photocatalytic properties. They need to be calcined at 500-600°C to convert them into crystalline TiO. 2 , which will make the composite photocatalyst lose its magnetic properties and lose the meaning of magnetic separation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Dissolve nickel nitrate and ferric nitrate in water at a molar ratio of 1:2, add sodium hydroxide solution to adjust the pH to 9.5, and then dilute ferrous chloride with a molar ratio of 1:50 between ferrous and ferric salts. Add iron to the above precipitation, add water to adjust the molar concentration of nickel salt and iron salt to 0.9, boil and reflux for 2 hours, filter, wash to pH = 7, transfer the prepared nickel ferrite nanoparticles into water to make a suspension for later use.

[0019] 2. Sodium hexametaphosphate is added to the nickel ferrite nanoparticle suspension at a mass ratio of dispersant and nickel ferrite nanoparticles of 3:20, and the mass ratio of silicon dioxide and nickel ferrite nanoparticles is 2:1. Add the soaked alkali solution into the nickel ferrite nanoparticle suspension, ultrasonically disperse it for 15 minutes, raise the temperature of the suspension to 90°C, then adjust the pH of the suspension to 9 with hydrochloric acid, contin...

Embodiment 2

[0022] 1. Dissolve nickel nitrate and ferric nitrate in water at a molar ratio of 1:2, add sodium hydroxide solution to adjust the pH to 9.5, and then dilute ferrous chloride with a molar ratio of 1:50 between ferrous and ferric salts. Add iron to the above precipitation, add water to adjust the molar concentration of nickel salt and iron salt to 0.9, boil and reflux for 2 hours, filter, wash to pH = 7, transfer the prepared nickel ferrite nanoparticles into water to make a suspension for later use.

[0023] 2. Sodium hexametaphosphate is added to the nickel ferrite nanoparticle suspension at a mass ratio of dispersant and nickel ferrite nanoparticles of 3:20, and the mass ratio of silicon dioxide and nickel ferrite nanoparticles is 2:1. Add the soaked alkali solution into the nickel ferrite nanoparticle suspension, ultrasonically disperse for 15 minutes, raise the temperature of the suspension to 90°C, then use nitric acid to adjust the pH of the suspension to 9, continue the ...

Embodiment 3

[0026] 1. Dissolve nickel nitrate and ferric chloride in water at a molar ratio of 1:2, add sodium hydroxide solution to adjust the pH to 9.5, and then dissolve nitrite at a molar ratio of ferrous and ferric salts of 1:50 Add iron to the above precipitation, add water to adjust the molar concentration of nickel salt and iron salt to 0.9, boil and reflux for 2 hours, filter, wash to pH = 7, transfer the prepared nickel ferrite nanoparticles into water to make a suspension for later use.

[0027]2. Add sodium silicate to the nickel ferrite nanoparticle suspension according to the mass ratio of dispersant and nickel ferrite nanoparticles 3:20, and mix the foam with the mass ratio of silicon dioxide and nickel ferrite nanoparticles 2:1. Add alkali solution to the nickel ferrite nanoparticle suspension, ultrasonically disperse for 15 minutes, raise the temperature of the suspension to 90°C, then adjust the pH of the suspension to 9 with sulfuric acid, continue the reaction for 5 hou...

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Abstract

A process for preparing the magnetically separable composite photo-catalyst includes such steps as synthesizing the nickel ferrite nano-particles as magnetic carrier by low-temp catalytic phase transfer method, liquid-phase depositing SiO2 nano-particles on the surface of nickel ferrite nano-particle, and coating TiO2 nano-particles. Its granularity is less than 15 nm, providing huge surface area.

Description

technical field [0001] The invention relates to a preparation method of a supported photocatalyst, in particular to a preparation method of a magnetically separable composite photocatalyst. Used in the field of environmental protection technology. Background technique [0002] Photocatalysis is an emerging technology for environmental purification. Studies in recent years have shown that many refractory pollutants can be significantly removed under the action of photocatalytic oxidation. The photocatalytic oxidation reaction has the following advantages: It can completely mineralize and decompose the pollutants, achieve the purpose of detoxification, decolorization, and deodorization, and will not produce secondary pollution; it can be reacted at normal temperature and pressure. Nano-titanium dioxide powder has been proved to be an efficient, non-toxic and stable photocatalytic material in recent years. It has good photocatalytic activity both in solution and in gas phase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/025B01J21/06
Inventor 上官文峰许士洪
Owner SHANGHAI JIAO TONG UNIV
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