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Preparation method for micro magnet-carried TiO2 catalyst

A micron-scale catalyst technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of difficult to meet the requirements of photocatalytic degradation reactions, narrow excitation wavelength range, low sunlight response, etc., to achieve The effect of improving the utilization rate of sunlight, shortening the sol time, and simplifying the preparation process

Active Publication Date: 2013-12-18
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the nanoscale TiO 2 Wide band gap, narrow excitation wavelength range, low response to sunlight, and nano-TiO 2 Hydrophilic, powdered TiO 2 Difficult to separate from aqueous media, thus limiting the size of nanoscale TiO 2 Application of Catalyst in Practical Water Treatment Process
Micron-sized large particle size TiO 2 Easy to separate from aqueous media, but difficult to meet the requirements of photocatalytic degradation reaction due to low quantum yield

Method used

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  • Preparation method for micro magnet-carried TiO2 catalyst
  • Preparation method for micro magnet-carried TiO2 catalyst
  • Preparation method for micro magnet-carried TiO2 catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Micron-scale magnetically supported TiO 2 Catalyst preparation

[0036] Process 1: Fe 3 o 4 Preparation of micron-sized magnetic cores with 85% loading

[0037] 37.5g FeSO 4 ·7H 2 O was dissolved in 500ml distilled water to prepare 0.27mol / L FeSO 4 Solution, sealed and preserved, prepared and used now; 32g Fe 2 (SO 4 ) 3 Dissolve in 500ml of distilled water to prepare 0.16mol / L Fe 2 (SO 4 ) 3 The solution is ready for immediate use; prepare a 2mol / L NaOH solution for later use. At a temperature of 15°C-35°C, mix 0.2g of activated MCM-41 mesoporous molecular sieve with 20ml of 0.27mol / L FeSO 4 Put the solution in a beaker, disperse it by ultrasonic for 5 minutes, and record it as component A; measure 50ml of 0.16mol / L Fe 2 (SO 4 ) 3 Solution, denoted as B component. Place component A in an ultrasonic disperser, turn on mechanical stirring and ultrasound, quickly add component B to component A and mix evenly to form component C; add 2 mol / L NaOH ...

Embodiment 2

[0041] Example 2 Micron-scale magnetically supported TiO 2 Catalyst preparation

[0042] Process 1: Fe 3 o 4 Preparation of micron-sized magnetic cores with 55% loading

[0043] 37.5g FeSO 4 ·7H 2 O was dissolved in 500ml distilled water to prepare 0.27mol / L FeSO 4 Solution, sealed and preserved, prepared and used now; 32g Fe 2 (SO 4 ) 3 Dissolve in 500ml of distilled water to prepare 0.16mol / L Fe 2 (SO 4 ) 3 The solution is ready for immediate use; prepare a 2mol / L NaOH solution for later use. At a temperature of 15°C-35°C, mix 1g of activated MCM-41 mesoporous molecular sieve with 20ml of 0.27mol / L FeSO 4 Put the solution in a beaker, disperse it by ultrasonic for 5 minutes, and record it as component A; measure 50ml of 0.16mol / L Fe 2 (SO 4 ) 3 Solution, denoted as B component. Place component A in an ultrasonic disperser, turn on mechanical stirring and ultrasound, quickly add component B to component A and mix evenly to form component C; add 2 mol / L NaOH so...

Embodiment 3

[0047] Example 3 Micron-scale magnetically supported TiO 2 Catalyst preparation

[0048] Process 1: Fe 3 o 4 Preparation of micron-sized magnetic cores with 20% loading

[0049] 37.5g FeSO 4 ·7H 2 O was dissolved in 500ml distilled water to prepare 0.27mol / L FeSO 4 Solution, sealed and preserved, prepared and used now; 32g Fe 2 (SO 4 ) 3 Dissolve in 500ml of distilled water to prepare 0.16mol / L Fe 2 (SO 4 ) 3 The solution is ready for immediate use; prepare a 2mol / L NaOH solution for later use. At a temperature of 15°C-35°C, mix 5g of activated MCM-41 mesoporous molecular sieve with 20ml of 0.27mol / L FeSO 4 Put the solution in a beaker, disperse it by ultrasonic for 5 minutes, and record it as component A; measure 50ml of 0.16mol / L Fe 2 (SO 4 ) 3 Solution, denoted as B component. Place component A in an ultrasonic disperser, turn on mechanical stirring and ultrasound, quickly add component B to component A and mix evenly to form component C; add 2 mol / L NaOH so...

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Abstract

The invention provides a preparation method for a micro magnet-carried TiO2 catalyst. The preparation method comprises the following steps of: pretreating a carrier, preparing a micro magnetic nucleus and preparing the micro magnet-carried TiO2 catalyst. The preparation method comprises the following steps of: with a micro MCM (Mesoporous Molecular Sieve-41 as a carrier, firstly, depositing nano Fe3O4 in an MCM-41 canal to form the micro magnetic nucleus; secondly, generating nano TiO2 in situ on the surface of the micro magnetic nucleus by adopting a sol-gel method; and coupling the micro magnetic nucleus with TiO2 to form a sunlight response and high-activity magnet-carried TiO2 catalyst. By introducing the Fe3O4, the optical excitation response wavelength of the TiO2 is effectively extended, wavelength red shift is absorbed by the catalyst and the utilization rate of sunlight is increased. In addition, with the micro magnetic property, the micro magnet-carried TiO2 catalyst is separated and recovered more easily and can be subjected to magnetic separation and recover by adopting an electromagnet or filtered and recovered by adopting a microporous filtering film, wherein the recovery rate can reach 100 percent.

Description

technical field [0001] The invention relates to inorganic functional materials and fine chemical preparation technology, and is a kind of micron-scale magnetically loaded TiO 2 Catalyst preparation method. Background technique [0002] Photocatalytic technology is an emerging green water treatment technology. It has outstanding advantages such as mild reaction conditions, the ability to mineralize most organic matter and eliminate heavy metal ion pollution. It has become an effective method for treating refractory wastewater. Among many semiconductor oxides, TiO 2 Because of its high efficiency, non-toxic, stable chemical properties, etc., it has unique advantages in the treatment of refractory organic matter mineralization and removal of heavy metal ion toxicity, and is a promising water treatment technology. [0003] Nano-sized TiO 2 The catalyst has the characteristics of quantum size effect and quantum tunneling effect, and has high photon quantum efficiency and photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/76B01J29/90C02F1/30
Inventor 费学宁解立平刘玉茹董业硕姜远光
Owner TIANJIN URBAN CONSTR COLLEGE
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