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Silver halide-titanium silicon aerogel ternary composite photocatalyst and preparation method thereof

A ternary composite and photocatalyst technology, which is applied in the field of photocatalysis, can solve the problems of limiting the practical application of AgX, weakening of photocatalytic activity, and low photocatalytic efficiency, and achieves the advantages of easy recovery of catalytic aging, long catalytic aging and high catalytic efficiency. Effect

Active Publication Date: 2017-01-11
山东科凝绝热新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its own defects, TiO 2 There are two major problems in the application of photocatalysts: (1) TiO 2 In the liquid environment, it generally exists in the state of suspended particles, and there is a problem that it is not suitable for recycling, and it is easy to cause secondary pollution of the system.
(2)TiO 2 The catalytic reaction requires ultraviolet light to be excited, and the photocatalytic efficiency is very low in the visible wavelength range.
Of course, AgX also has its inherent defects as a photocatalyst, that is, AgX is easy to decompose into elemental Ag and halogen under the irradiation of visible light, and the photocatalytic activity gradually weakens, that is, the catalytic aging of AgX is very low, which greatly limits the use of AgX as a photocatalyst. Practical Applications of Catalysts

Method used

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  • Silver halide-titanium silicon aerogel ternary composite photocatalyst and preparation method thereof
  • Silver halide-titanium silicon aerogel ternary composite photocatalyst and preparation method thereof
  • Silver halide-titanium silicon aerogel ternary composite photocatalyst and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0028] (1) Evenly mix tetraethyl orthosilicate and absolute ethanol at a volume ratio of 1:2, adjust the pH value of the solution to 0.6 with acid, and continue hydrolysis at room temperature to obtain SiO 2 Sol;

[0029] (2) Mix tetrabutyl titanate and absolute ethanol uniformly in a volume ratio of 1:2, adjust the pH value to 1 with acid to obtain solution 1; mix uniformly with absolute ethanol and deionized water in a volume ratio of 1:1 , use acid to adjust the pH value to 0.6 to obtain solution 2; solution 1 and solution 2 are mixed at a volume ratio of 4.8:1 to obtain TiO 2 Sol;

[0030] (3) Mix SiO with strong stirring 2 The sol was slowly added dropwise to the TiO with a dropper 2 Sol (SiO 2 Sol and TiO 2The volume ratio of the sol is 2:1), and add ammonia water to adjust the pH value to 5, and let it stand at room temperature until it coagulates to obtain a composite alcohol gel; the alcohol gel is aged for 12 hours, and then soaked in absolute ethanol for 2 days...

Embodiment 2

[0035] (1) Mix propyltrimethoxysilane and absolute ethanol uniformly at a volume ratio of 1:1, adjust the pH value of the solution to 0.7 with acid, and continue hydrolysis at room temperature to obtain SiO 2 Sol;

[0036] (2) Mix tetraisopropyl titanate and absolute ethanol uniformly at a volume ratio of 1:0.5, and adjust the pH value to 0.7 with acid to obtain solution 1; Mix and adjust the pH value to 0.6 with acid to obtain solution 2; mix solution 1 and solution 2 at a volume ratio of 3:1 to obtain TiO 2 Sol;

[0037] (3) Mix SiO with strong stirring 2 The sol was slowly added dropwise to the TiO with a dropper 2 In the sol (SiO 2 Sol and TiO 2 The volume ratio of the sol is 1:1), and ammonia water is added to adjust the pH value to 6; the composite alcohol gel is obtained by standing at room temperature until it coagulates; the alcohol gel is aged for 24 hours, and then soaked in absolute ethanol for 2 days, during which Replace absolute ethanol 6 times, and then p...

Embodiment 3

[0042] (1) Evenly mix isobutyl triethoxy silicon and absolute ethanol at a volume ratio of 1:2, adjust the pH value of the solution to 0.6 with acid, and continue hydrolysis at room temperature to obtain SiO 2 Sol;

[0043] (2) Mix isopropyl titanate triisostearate and absolute ethanol uniformly at a volume ratio of 1:2, and adjust the pH value to 0.5 with acid to obtain solution 1; 1 volume ratio is uniformly mixed, and the pH value is adjusted to 1 with acid to obtain solution 2; solution 1 and solution 2 are mixed at a volume ratio of 5:1 to obtain TiO 2 Sol;

[0044] (3) Mix SiO under strong stirring 2 The sol was slowly added dropwise to the TiO with a dropper 2 In the sol (SiO 2 Sol and TiO 2 The volume ratio of the sol is 2:1), and add ammonia water to adjust the pH value to 5, and let it stand at room temperature until it coagulates to obtain a composite alcohol gel; the alcohol gel is aged for 36 hours, and then soaked in absolute ethanol for 4 days, during which...

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Abstract

The invention discloses a silver halide-titanium silicon aerogel ternary composite photocatalyst and a preparation method thereof. The preparation method comprises the steps that a TiO2-SiO2 aerogel bulk material is prepared by combining a sol-gel method with a supercritical drying method, Ag nanoparticles are deposited in aerogel mesopores, AgX particles are prepared through a redox reaction between Ag and FeX3, and then the AgX-TiO2-SiO2 composite photocatalyst is prepared. Accordingly, the ternary composite photocatalyst which has the advantages of being high in catalytic activity, long in catalytic time and easy to recycle simultaneously is prepared by utilizing the titanium silicon aerogel bulk material as a carrier of the AgX nanoparticles and fully exerting the synergistic photocatalytic effect of AgX, TiO2 and SiO2.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to an airgel ternary composite photocatalyst and a preparation method thereof. Background technique [0002] Since Professor Fujishima and Honda reported in n-type TiO in 1972 2 After the photocatalytic decomposition of water was found on the electrode to produce hydrogen and oxygen, the application of photocatalysts in solving energy and environmental problems has attracted more and more attention from researchers. Various new and efficient photocatalysts have been developed. The photocatalytic mechanism has also been explored in depth. [0003] So far, TiO 2 It is the only photocatalyst that has really realized practical application, and has been widely used in the fields of air purification, degradation of organic pollutants and reduction of heavy metals. However, due to its own defects, TiO 2 There are two major problems in the application of photocatalyst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/04B01J27/10B01J27/08
CPCB01J27/08B01J27/10B01J35/56B01J35/39
Inventor 琚伟伊希斌张晶刘本学王启春范会利沈晓冬
Owner 山东科凝绝热新材料科技有限公司
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