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Process for preparing nano porous titanium dioxide photocatalytic material

A photocatalytic material, titanium dioxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of easy particle shedding, low material strength, low catalyst activity, etc., to achieve easy separation and Effects of recycling, high photocatalytic activity, and good application prospects

Inactive Publication Date: 2012-01-04
山东亿康环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

TiO 2 The immobilization of the solution solves the problem of solid-liquid separation, but the loaded TiO 2 The activity of the catalyst is generally low, one of the reasons is that the contact between the reactant and the supported catalyst is not sufficient.
But using the sol-gel method to prepare porous TiO 2 , TiO during calcination 2 The structure of the anatase is easy to change. In order to maintain the anatase structure, it must be sintered at a low temperature, so the strength of the material is very low. TiO 2 Particles are easy to fall off, causing secondary pollution

Method used

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  • Process for preparing nano porous titanium dioxide photocatalytic material
  • Process for preparing nano porous titanium dioxide photocatalytic material
  • Process for preparing nano porous titanium dioxide photocatalytic material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This embodiment includes the following steps:

[0022] (1) Select granularity D 50 (corresponding particle diameter when cumulative particle size distribution percentage reaches 50%) is the anatase type nano-titanium dioxide of 17nm as raw material;

[0023] (2) After granulation, press molding under 80MPa pressure to make green body;

[0024] (3) Put the molded green body into an air sintering furnace for heating and sintering, the sintering temperature is 750° C., keep warm for 20 minutes and then cool with the furnace to obtain a porous titanium dioxide block;

[0025] (4) Through testing, the porosity of the sintered titanium dioxide block is 67%, the bending strength is 3.8MPa, and the anatase phase content is 85%.

[0026] figure 1 It is the SEM photo of the fracture of the sample obtained in this example. It can be seen from the photo that the grain size of the sample after sintering is less than 100 nm, indicating that the titanium dioxide block obtained acco...

Embodiment 2

[0029] This embodiment also includes the four steps described in Embodiment 1, where the difference is

[0030] Select the particle size D of anatase type nano-titanium dioxide in step (1) 50 19nm;

[0031] The pressure of molding in step (2) is 70MPa;

[0032] The sintering temperature in the step (3) is 700°C, and the temperature is kept for 15 minutes;

[0033] The titanium dioxide block sintered in step (4) has a porosity of 70%, a bending strength of 3.2 MPa, and an anatase phase content of 100%.

Embodiment 3

[0035] This embodiment also includes the four steps described in Embodiment 1, where the difference is

[0036] Select the particle size D of anatase type nano-titanium dioxide in step (1) 50 18nm;

[0037] The compression molding pressure in step (2) is 90MPa;

[0038] The sintering temperature in the step (3) is 850° C., and the temperature is kept for 25 minutes;

[0039] The titanium dioxide block sintered in step (4) has a porosity of 15%, a bending strength of 24.6 MPa, and an anatase phase content of 79%.

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Abstract

The invention discloses a process for preparing a nano porous titanium dioxide photocatalytic material, which comprises the following steps of: selecting anatase nano titanium dioxide with the granularity D50 of 17-20nm; granulating, and performing compression molding under the pressure of between 70 and 90 MPa to form a blank; sintering the blank in an air sintering furnace at the temperature ofbetween 700 and 850 DEG C for 15 to 25 minutes; and finally obtaining the titanium dioxide block material with good photocatalysis, which has the porosity of 15 to 70 percent, strength of 3.2 to 24.6MPa and the anatase content of about 79-100 percent. The process has the advantages of easy recovery, repeated use, and no secondary pollution.

Description

technical field [0001] The invention relates to a method for preparing a nano titanium dioxide block material with photocatalytic performance under normal pressure. Background technique [0002] Semiconductors with heterogeneous photocatalytic properties including WO 3 、TiO 2 , CdS, ZnS, ZnO, Fe 2 o 3 , CdSe, etc. In comparison, TiO 2 The source is abundant, the price is low, its photoelectrochemical performance is very stable, it is resistant to light corrosion, and it has a deep valence band energy level, which can make some endothermic reactions occur in TiO irradiated by light. 2 Particle surfaces are realized and accelerated, and more importantly TiO 2 It is non-toxic to the human body and microorganisms, and is an ideal environment-friendly photocatalyst. [0003] Catalytic TiO 2 Mostly powder or film. TiO 2 After the powder is mixed with other additives, it is evenly dispersed in the aqueous solution, and the suspension state in the solution is maintained by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J35/10
Inventor 杨建锋王洪业金海云鲍崇高乔冠军王继平王红洁
Owner 山东亿康环保科技有限公司
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