Preparation method of silver-loaded floating hollow titanium dioxide taking cationic polymer as intermediate

A cationic, titanium dioxide technology, used in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. The effect of improving the activity and utilization efficiency of visible light, improving the adhesion stability, and expanding the scope of application

Inactive Publication Date: 2016-07-13
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Photocatalytic degradation is an efficient and cheap advanced oxidation treatment method for organic pollutants, titanium dioxide (TiO 2 ) is the most widely used photocatalyst, but titanium dioxide is subject to great limitations when used under natural conditions: lack of continuous stirring conditions, titanium dioxide is easy to settle and reduce its catalytic effect; the catalytic effect is greatly affected by the water transmittance; the catalyst is difficult to recycle , causing waste and secondary pollution
Loading titanium dioxide on the surface of the carrier is an effective means to solve the above problems. The carrier includes glass fiber, high polymer, inorganic light carrier, etc., but at present, the commercial powder titanium dioxide is basically loaded on the surface of the carrier by dip coating, which can be in contact with pollutants. The surface area of ​​the catalyst is small; the loaded commercial titanium dioxide is pure titanium dioxide with a single crystal form or a mixed crystal form, and the utilization rate of visible light is not high
In addition, since dip coating is a physical mixing method, the combination of titanium dioxide and the carrier is weak, and the stability of the catalyst is difficult to be guaranteed.

Method used

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  • Preparation method of silver-loaded floating hollow titanium dioxide taking cationic polymer as intermediate
  • Preparation method of silver-loaded floating hollow titanium dioxide taking cationic polymer as intermediate
  • Preparation method of silver-loaded floating hollow titanium dioxide taking cationic polymer as intermediate

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A silver-loaded floating hollow titanium dioxide with a cationic polymer as an intermediate, the preparation method of which is as follows:

[0029] (1) Dilute 250mL of cationic polystyrene C-PSt emulsion with a solid content of 20% with water to a solid content of 5%; add 50g of fly ash to the above emulsion and stir for 10 minutes, let it stand, and remove the floating powder Coal ash particles are separated and dried to obtain fly ash particles Fly-ash / C-PSt loaded with C-PSt;

[0030] (2) Add the Fly-ash / C-PSt particles separated in step (1) into 500mL alcohol aqueous solution, wherein the alcohol aqueous solution is prepared by ethanol and water at a volume ratio of 49:1. Dilute 20mL of tetrabutyl titanate with ethanol to 50mL, and slowly add it into the above-mentioned alcohol aqueous solution under stirring conditions, stir well until a large amount of white precipitate is formed, let it stand still, separate the upper layer of fly ash particles, and dry at 80°C ...

Embodiment 2

[0034] A floating hollow titanium dioxide with a cationic polymer as an intermediate, the preparation method of which is as follows:

[0035] (1) Dilute 250mL of cationic polystyrene C-PSt emulsion with a solid content of 20% with water to a solid content of 5%; add 50g of fly ash to the above emulsion and stir for 10 minutes, let it stand, and remove the floating powder Coal ash particles are separated and dried to obtain fly ash particles Fly-ash / C-PSt loaded with C-PSt;

[0036] (2) Add the Fly-ash / C-PSt particles separated in step (1) into 500mL alcohol aqueous solution, wherein the alcohol aqueous solution is prepared by ethanol and water at a volume ratio of 49:1. Dilute 20mL of tetrabutyl titanate with ethanol to 50mL, and slowly add it to the above alcohol aqueous solution under stirring conditions, stir well until a large amount of white precipitate is formed, let it stand, separate the upper layer of fly ash particles, and dry at 80°C Obtain composite particles Fly-...

Embodiment 3

[0039] A kind of fly ash directly loads the catalyst of titanium dioxide, and its preparation method is as follows:

[0040]Add 50g of fly ash particles to 500mL of alcohol aqueous solution prepared by ethanol and water at a volume ratio of 49:1, then dilute 20mL of tetrabutyl titanate with ethanol to 50mL and then add 0.6mL of 0.1mol / L AgNO 3 The solution is prepared as a mixed solution, and then the mixed solution is slowly added to the alcohol aqueous solution containing fly ash particles under stirring conditions, fully stirred until a large amount of white precipitates are formed, let it stand, and the upper layer of fly ash particles are separated, 80 ℃ After drying, and then roasting at 600°C for 4 hours, the silver-doped composite catalyst Fly-ash / TiO directly loaded on the fly ash particles was obtained. 2 / Ag.

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Abstract

The invention discloses a preparation method of silver-loaded floating hollow titanium dioxide taking a cationic polymer as an intermediate. The preparation method comprises the following steps: selecting cationic polystyrene as an intermediate substance; adsorbing the polymer on the surface of a lightweight inorganic carrier under the action of electrical attraction to obtain inorganic carrier/cationic polymer composite particles; furthermore, depositing nano titanium dioxide and noble metal on the surface of the polymer to obtain polymer/titanium dioxide/noble metal composite particles loaded on the surface of the carrier; and finally, roasting to remove the organic polymer to realize loading and gathering of the titanium dioxide loaded with the noble metal on the surface of the lightweight inorganic carrier. The titanium dioxide prepared by the method is in a hollow structure and can be arrayed on the surface of the carrier for a plurality of layers, so that the specific surface area is relatively large and the catalytic activity is good. When the catalyst is used, the catalyst floats on the water surface and does not need to be stirred, and is not influenced by water turbidity; and the catalyst is suitable for being used in a natural environment and can be recycled and repeatedly used.

Description

technical field [0001] The invention relates to a method for preparing a floating catalyst, in particular to a method for preparing silver-loaded floating hollow titanium dioxide with a cationic polymer as an intermediate. Background technique [0002] Photocatalytic degradation is an efficient and cheap advanced oxidation treatment method for organic pollutants, titanium dioxide (TiO 2 ) is the most widely used photocatalyst, but titanium dioxide is subject to great limitations when used under natural conditions: lack of continuous stirring conditions, titanium dioxide is easy to settle and reduce its catalytic effect; the catalytic effect is greatly affected by the water transmittance; the catalyst is difficult to recycle , causing waste and secondary pollution. Loading titanium dioxide on the surface of the carrier is an effective means to solve the above problems. The carrier includes glass fiber, high polymer, inorganic light carrier, etc., but at present, the commerci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50
CPCB01J23/50B01J35/004B01J35/026B01J35/1019B01J37/082
Inventor 王金刚
Owner UNIV OF JINAN
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