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Nano titanium dioxide photocatalyst supported by silver and preparation method thereof

A nano-titanium dioxide and titanium dioxide technology, applied in the field of inorganic nano-photocatalyst materials and their preparation, can solve the problems of low catalytic activity, small specific surface area, low natural light absorption efficiency, etc., and achieve high light absorption capacity, large specific surface area, and good visible light response. performance effect

Active Publication Date: 2015-09-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] What the present invention will solve is that the current commercial P25 specific surface area is small (50-70m 2 / g), low absorption efficiency of natural light, low photocatalytic activity under visible light and other technical problems, a silver-supported nano-titanium dioxide photocatalyst and its preparation method are provided. The titanium dioxide photocatalyst has a high specific surface area and good visible light response. Performance and visible light photocatalytic activity, showing excellent performance that commercial catalysts do not have in terms of degradation of organic pollutants; and its preparation method has the advantages of simplicity, low price and good repeatability

Method used

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  • Nano titanium dioxide photocatalyst supported by silver and preparation method thereof
  • Nano titanium dioxide photocatalyst supported by silver and preparation method thereof
  • Nano titanium dioxide photocatalyst supported by silver and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Weigh 1:0.8 parts by volume of tetraethyl orthosilicate and ammonia water, dissolve in a mixed solution of 6 parts by volume of deionized water and 36 parts by volume of ethanol, stir the solution for 4 hours until the hydrolysis is complete, and then centrifuge. Obtain solid silicon dioxide;

[0028] (2) ultrasonically disperse the solid silica obtained in step (1) into 5ml of ethanol solution;

[0029] (3) Dissolve hydroxypropyl cellulose in 20ml of ethanol, mix with the silicon dioxide ethanol solution obtained in step (2), and stir evenly;

[0030] (4) adjusting the pH value of the ethanol mixture of hydroxypropyl cellulose and silicon dioxide in step (3) to 6-9 with ammonia water;

[0031] (5) at 0.5mL·min -1 Add 1ml of tetrabutyl titanate dropwise to the mixed solution obtained in step (4) at the speed of 1, stir evenly, recirculate at 85°C, cool to room temperature naturally, centrifuge, wash, and dry to obtain silica / titania nuclei shell photocatalyst;

...

Embodiment 2

[0039] (1) Weigh 1:0.8 parts by volume of tetraethyl orthosilicate and ammonia water, dissolve in a mixed solution of 6 parts by volume of deionized water and 36 parts by volume of ethanol, stir the solution for 4 hours until the hydrolysis is complete, and then centrifuge. Obtain solid silicon dioxide;

[0040] (2) ultrasonically disperse the solid silica obtained in step (1) into 5ml of ethanol solution;

[0041] (3) Dissolve hydroxypropyl cellulose in 20ml of ethanol, mix with the silicon dioxide ethanol solution obtained in step (2), and stir evenly;

[0042] (4) adjusting the pH value of the ethanol mixture of hydroxypropyl cellulose and silicon dioxide in step (3) to 6-9 with ammonia water;

[0043] (5) at 2mL·min -1Add 1ml of tetrabutyl titanate dropwise to the mixture obtained in step (4) at the speed of 100°C, stir evenly, recirculate at 65°C, cool naturally to room temperature, centrifuge, wash, and dry to obtain silica / titania nuclei shell photocatalyst;

[0044...

Embodiment 3

[0049] (1) Weigh 1:0.8 parts by volume of tetraethyl orthosilicate and ammonia water, dissolve in a mixed solution of 6 parts by volume of deionized water and 36 parts by volume of ethanol, stir the solution for 4 hours until the hydrolysis is complete, and then centrifuge. Obtain solid silicon dioxide;

[0050] (2) ultrasonically disperse the solid silica obtained in step (1) into 5ml of ethanol solution;

[0051] (3) Dissolve hydroxypropyl cellulose in 20ml of ethanol, mix with the silicon dioxide ethanol solution obtained in step (2), and stir evenly;

[0052] (4) adjusting the pH value of the ethanol mixture of hydroxypropyl cellulose and silicon dioxide in step (3) to 6-9 with ammonia water;

[0053] (5) at 3mL·min -1 Add 1ml of tetrabutyl titanate dropwise to the mixed solution obtained in step (4) at the speed of 1, stir evenly, recirculate at 60°C, cool naturally to room temperature, centrifuge, wash, and dry to obtain silica / titania nuclei shell photocatalyst;

[...

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Abstract

The invention discloses silver-loaded nanometer titanium dioxide photocatalyst and a preparation method thereof. The titanium dioxide nanometer particle is of a cup-shaped structure and has anatase crystalline phase with a particle diameter of 140nm-160nm. The silver colloid particle is loaded on inner and outer surfaces of the titanium dioxide nanometer particle with the cup-shaped structure. The preparation method of the silver-loaded nanometer titanium dioxide photocatalyst comprises the following steps of: synthesizing by a using a surfactant template method, etching hollow spherical titanium dioxide into a cup-shaped structure by using high-concentration sodium hydroxide; and loading the silver colloid particle to form the silver-loaded nanometer titanium dioxide photocatalyst. The photocatalyst disclosed by the invention has a high specific surface area, good visible light response performance and visible light catalytic activity, and has excellent performances which are not superior to those of commercial catalysts in terms of degradation of organic pollutants and the like. Moreover, the preparation method is simple and easy to implement and has the advantages of low price, good repeatability and the like.

Description

technical field [0001] The invention relates to the field of inorganic nanometer photocatalyst material and its preparation, in particular to a titanium dioxide nanometer photocatalyst and its preparation method. Background technique [0002] With the continuous development of today's society, problems such as energy shortage and environmental pollution are becoming more and more serious; especially the problem of environmental pollution has seriously restricted the sustainable development of human society. How to use an efficient means to solve these problems is a major problem that mankind needs to face together. As we all know, solar energy is an inexhaustible energy source. If solar energy can be fully utilized, problems such as energy shortage and environmental pollution will be greatly alleviated. [0003] Many pollutants discharged by modern industry are difficult to be solved by conventional treatment methods, among which some common refractory pollutants such as or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50
Inventor 巩金龙卢健伟王拓张鹏张冀杰马新宾
Owner TIANJIN UNIV