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Titanium dioxide intercalation photocatalysed composite material and preparation method thereof

A composite material, titanium dioxide technology, used in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effect of avoiding damage

Inactive Publication Date: 2012-08-29
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In theory, most of these methods can obtain titanium dioxide with a particle size of less than 10nm, but in order to obtain the anatase crystal form, high temperature treatment will increase the grain size, and at the same time, the technical bottleneck of large-scale nanopowder preparation is Agglomeration of particles, which cannot be overcome by the above methods by themselves
In practical application, another technical problem is that nano-titanium dioxide particles are small (generally less than 50nm), suspended in the solution, and it is extremely difficult to recover after use.
The general treatment method is to load the titanium dioxide photocatalyst. For example, the patent 02139272.2 supports the titanium dioxide photocatalyst on the metal surface, and the patent 02139274.9 uses the adsorption of activated carbon particles to load titanium dioxide on the activated carbon. Titanium, patent 00815646.8, supports titanium dioxide on a thermoplastic polymer carrier. The method of loading can solve the problem of photocatalyst recovery, and some methods can also improve the photocatalytic performance of titanium dioxide, but the growth and distribution of titanium dioxide on the loaded surface lack control. It is difficult to avoid agglomeration. Generally speaking, its photocatalytic effect is lower than that before loading

Method used

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  • Titanium dioxide intercalation photocatalysed composite material and preparation method thereof
  • Titanium dioxide intercalation photocatalysed composite material and preparation method thereof
  • Titanium dioxide intercalation photocatalysed composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] Example 1: Weigh about 20g of α-zirconium phosphate and put it into a 100ml beaker, add 100ml of 0.2mo.L NaCl solution, stir and react at room temperature for 4 hours, filter, fully wash with distilled water 3 times, separate liquid and solid, and store at 65°C After drying for 24 hours, the sample was ready for use (referred to as sample I). Add 25mL of 95% ethanol and 15mL of absolute ethanol to a 100ml beaker, add 10mL of n-butyl titanate under continuous stirring, stir for 3 hours for hydrolysis, then add 5g of sample I, and shake the resulting suspension at 50°C under a shaker After 3 hours, filter, wash with 50% ethanol aqueous solution for 3 times, then wash the solid phase with distilled water, dry in a 65°C oven for 24 hours, and set aside the solid phase for use (marked as sample II), take 3g of sample II and put it into the inner lining In a polytetrafluoroethylene stainless steel autoclave with a volume of 100mL, add deionized water to make the volume of the...

Embodiment 2

[0024] Example 2: Add 25mL of 95% ethanol and 15mL of absolute ethanol to a 100ml beaker, add 25mL of n-butyl titanate under continuous stirring, stir and hydrolyze for 2 hours, then add 5g of the sample I prepared in Example 1 to obtain The suspension was vibrated at 50° C. for 3 hours on a shaker, filtered, washed three times with 50% ethanol aqueous solution, and then the solid phase was washed with distilled water, dried in an oven at 65° C. for 24 hours, and the solid phase was ready for use (referred to as sample III). Take 3g of sample III and put it into a stainless steel high-pressure reactor lined with polytetrafluoroethylene. The volume of the reactor is 100mL. Add deionized water to make the volume of the solution reach 70% of the volume of the reactor. In the process, the temperature of the oven was adjusted to 240°C. After reacting for 2 hours, it was taken out of the oven, cooled naturally, opened, filtered with suction, separated from solid and liquid, washed wi...

Embodiment 3

[0026] Example 3: Add 25mL of 95% ethanol and 15mL of absolute ethanol to a 100ml beaker, add 20mL of n-butyl titanate under continuous stirring, stir and hydrolyze for 2 hours, then add 5g of the sample I prepared in Example 1 to obtain The suspension was vibrated at 50° C. for 3 hours on a shaker, filtered, washed three times with 50% aqueous ethanol, and then the solid phase was washed with distilled water, dried in an oven at 65° C. for 24 hours, and the solid phase was ready for use (referred to as sample IV). Take 3g of sample IV and put it into a stainless steel autoclave lined with polytetrafluoroethylene. The volume of the autoclave is 100mL. Add deionized water to make the volume of the solution reach 70% of the volume of the autoclave, and place the closed autoclave in an oven. , the oven temperature was adjusted to 1500°C, after 4 hours of reaction, it was taken out of the oven, cooled naturally, opened, filtered with suction, separated from solid and liquid, washed...

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Abstract

The invention provides an anatase-type nanometer-sized titanium dioxide intercalation photocatalysed composite material. The composite material comprises alpha-zirconium phosphate and titanium dioxide, wherein the titanium dioxide is inserted among alpha-zirconium phosphate layers and the content of the titanium dioxide is 0.5-5% by weight percentage. In order to prepare the composite material, the invention uses the following technical scheme: the titanium dioxide with a granularity smaller than 1nm is inserted among the alpha-zirconium phosphate layers to form the photocatalysed composite material, the composite material comprises the alpha-zirconium phosphate and the titanium dioxide, wherein the titanium dioxide is inserted among alpha-zirconium phosphate layers and the content of the titanium dioxide is 0.5-5% by weight percentage. The preparation method comprises: inserting hydrolyzed butyl titanate among the layers of the alpha-zirconium phosphate subjected to exchange treatment, hydrothermally reacting and crystallizing at 150-240 DEG C to form the anatase-type nanometer-sized titanium dioxide intercalation photocatalysed composite material with the granularity smaller than 1nm. The granules of the anatase titanium dioxide in the photocatalysed composite material prepared by the invention are smaller than 1nm, and the nanometer-sized titanium dioxide intercalation is among the layers of the alpha-zirconium phosphate rather than loaded on a surface.

Description

technical field [0001] The invention relates to an anatase nano-titanium dioxide intercalation photocatalytic composite material and a preparation method thereof. Background technique [0002] Nano-titanium dioxide has been used as a photocatalyst for more than 30 years. Its chemical properties are stable, non-toxic and non-polluting. It has become the photocatalyst of choice for indoor air purification, harmless treatment of natural water bodies and industrial wastewater, and is used in many organic photocatalytic reactions. middle. Its catalytic mechanism is that when the nano-titanium dioxide particle size is smaller than a certain critical size, the absorption of ultraviolet light is blue-shifted, the band gap increases, a larger oxidation-reduction potential is generated, the charge transfer rate is greatly increased, and the quantum yield and photocatalysis are improved. reaction efficiency. A large number of research results show that the quantum yield of titanium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/18B01J37/10
Inventor 陈若愚王健伍钟璟王红宁刘小华
Owner JIANGSU POLYTECHNIC UNIVERSITY
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