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Self-cleaning titanium dioxide composite type photocatalyst

A technology of titanium dioxide and photocatalyst, which is applied in the field of self-cleaning titanium dioxide composite photocatalyst, which can solve the problems of catalyst pollution and deactivation

Inactive Publication Date: 2015-04-01
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main technical problem to be solved in this patent is to solve the main problem that the catalyst is easily polluted and deactivated when using photocatalysts. It is proposed to use linearly polymerized temperature-sensitive material PNIPAM to wrap titanium dioxide magnetic microspheres. When the organic matter or colloid in the reaction system adheres After the surface of the catalyst, the catalyst can be separated by magnetic separation, and then placed in warm water. The phase inversion characteristics of PNIPAM will desorb these hydrophilic pollutants to achieve the effect of self-cleaning

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Take FeCl 3 ·6H 2O (1.35g, 5.0mmol), trisodium citrate (0.35g, 1.34mmol), anhydrous sodium acetate (2.0g, 24.4mmol) were fully dissolved in 40mL of ethylene glycol, stirred vigorously at room temperature for 1h and then transferred to In a stainless steel hydrothermal reaction kettle with polytetrafluoroethylene lining, heat to 200°C, take it out after 10 hours of reaction and cool it to room temperature, magnetically separate the product, wash it with ethanol and water several times, and put it in a vacuum drying oven to dry to a constant mass to obtain Fe with a particle size of 240 nm 3 o 4 magnetic particles.

[0030] (2) Take 100mg Fe 3 o 4 For magnetic particles, add 1mL of ammonia water to a mixed solution of ethanol / acetonitrile (2:1v / v) with a total volume of 150mL, mix it uniformly with ultrasound, then stir mechanically, add 1.0mL TBOT after 1-2h, continue stirring for 4h, and then magnetically separate the product. After washing several times with ...

Embodiment 2

[0034] (1) Take 0.01mol FeCl respectively 3 ·6H 2 O and 15mL of 2mol / L NaOH solution were dispersed in 30mL of secondary water, and the precipitate obtained was washed 6 times with secondary water, then dispersed in 50mL of 2mol / L NaOH solution, stirred by magnetic force for 1h, and then transferred to an autoclave. React at 160°C for 16h, wash with absolute ethanol three times for purification after cooling, put it in a vacuum drying oven at 40°C and dry to constant weight to obtain α-Fe 2 o 3 particle.

[0035] (2) Take 100mg α-Fe 2 o 3 For magnetic particles, add 1mL of ammonia water to a mixed solution of ethanol / acetonitrile (2:1v / v) with a total volume of 150mL, mix it uniformly with ultrasound, then stir mechanically, add 1.0mL TBOT after 1-2h, continue stirring for 4h, and then magnetically separate the product. After washing several times with ethanol and acetonitrile, TiO 2 encapsulated α-Fe 2 o 3 Particles (α-Fe 2 o 3 / TiO 2 ), the α-Fe 2 o 3 / TiO 2 Ca...

Embodiment 3

[0039] (1) Take 1.50g FeCl 3 ·6H 2 O, 0.35g trisodium citrate, 2.0g anhydrous sodium acetate are fully dissolved in 40mL ethylene glycol, at room temperature, stir vigorously for 1h and then transfer to a stainless steel hydrothermal reaction kettle with a polytetrafluoroethylene liner, heat to 200°C, react for 18 hours, take it out and cool it to room temperature, magnetically separate the product, wash it with ethanol and water several times, and dry it in a vacuum drying oven to a constant mass to obtain Fe with a particle size of 300nm. 3 o 4 magnetic particles.

[0040] (2) Take 100mg Fe 3 o 4 For magnetic particles, add 1mL of ammonia water to a mixed solution of ethanol / acetonitrile (2:1v / v) with a total volume of 150mL, mix it uniformly with ultrasound, then stir mechanically, add 1.0mL TBOT after 1-2h, continue stirring for 4h, and then magnetically separate the product. After washing several times with ethanol and acetonitrile, TiO 2 wrapped Fe 3 o 4 Particle...

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PUM

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Abstract

The invention discloses a titanium dioxide composite type photocatalyst with a self-cleaning function. The preparation method comprises the steps of loading titanium dioxide on ferric oxide by taking magnetic ferric oxide as an inner core, and then grafting a layer of poly (N-isopropylacrylamide) (PNIPAM) with a temperature sensitive property. The catalyst has a good self-cleaning property, i.e., at normal temperature, the catalyst can perform light degradation on organisms in water; after reaction, the catalyst can be separated from a system by magnetic separation, and then is put into warm water at about 40 DEG C; PNIPAM is subjected to hydrophobic effect; hydrophilic organic pollutants and colloid on the surface of the catalyst can be removed automatically so as to reach a self-cleaning effect; the whole cleaning and regeneration process is simple and feasible.

Description

technical field [0001] The invention belongs to the technical field of micro-nano materials, and relates to a titanium dioxide composite photocatalyst with self-cleaning properties. The catalyst is characterized in that the inner core is composed of magnetic materials, and the outer layer is composed of temperature-sensitive materials. When the temperature is higher than the phase transition temperature, The temperature-sensitive material will be dehydrated and undergo hydrophobic shrinkage, which will lead to the detachment of the attached pollutants on the surface of the catalyst and achieve the effect of self-cleaning. Background technique [0002] In recent years, with the continuous deepening of nanomaterials research, functionalization and intelligence have gradually become an important direction of nanomaterials research, among which organic-inorganic hybrid composite microspheres have attracted widespread attention. The core of the catalyst composed of magnetic mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J31/40C02F1/30
Inventor 代昭杨坤黄丹丹
Owner TIANJIN POLYTECHNIC UNIV