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Multi-level double-pore structure composite photocatalyst, preparation and application thereof

A composite photocatalyst technology, applied in the direction of heterogeneous catalyst chemical elements, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of difficult reuse and low solar energy utilization rate of photocatalysts and other problems, to achieve the effect of repeated and efficient use, easy centrifugation and improved stability

Active Publication Date: 2020-02-14
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is aimed at TiO 2 Photocatalysts have disadvantages such as low utilization rate of solar energy and difficulty in recycling, and provide a dendritic mesoporous SiO with a multi-level double-pore structure 2 / TiO 2 / Au / SiO 2 Composite photocatalyst and its preparation method and application, the catalyst has a multi-level double-hole structure, can degrade organic dyes in the visible light region, has good photocatalytic performance, high light energy utilization rate, and can be reused

Method used

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  • Multi-level double-pore structure composite photocatalyst, preparation and application thereof
  • Multi-level double-pore structure composite photocatalyst, preparation and application thereof
  • Multi-level double-pore structure composite photocatalyst, preparation and application thereof

Examples

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Effect test

Embodiment 1

[0034] (1) TiO modified with oleic acid 2 Preparation of nanoparticles

[0035] Add 4.53ml oleylamine, 8.75ml oleic acid, 3.43ml absolute ethanol, 1.021ml tetrabutyl titanate into a 50ml beaker, stir for 10min, then transfer to 50ml containing 11.77ml ethanol aqueous solution (volume concentration is 96%) In a tetrafluoroethylene-lined stainless steel reactor, react at 180°C for 14h. After the reaction, wash 3 times with absolute ethanol to obtain oleic acid-modified TiO 2 Nanoparticles 0.273g, the average particle size is 7.52nm, XRD figure see figure 1 As shown in the middle curve a, the transmission electron microscope picture is shown in figure 2 Shown in a, and then dispersed in 30ml of toluene.

[0036] (2) Thiolated dendritic mesoporous SiO 2 preparation of

[0037] Dissolve 0.068g TEA in 25ml water, stir magnetically in an oil bath at 80°C for 30min, then add 0.38gCTAB and 0.218g NaSal and stir for 1h, then add 4ml TEOS, react for 3h, after the reaction, wash the...

Embodiment 2

[0043] (1) TiO modified with oleic acid 2 Preparation of nanoparticles

[0044] Add 4.53ml oleylamine, 8.75ml oleic acid, 3.43ml absolute ethanol, 1.021ml tetrabutyl titanate into a 50ml beaker, stir for 10min, then transfer to 50ml containing 11.77ml ethanol aqueous solution (volume concentration is 96%) In a tetrafluoroethylene-lined stainless steel reactor, react at 180°C for 18h. After the reaction, wash 3 times with absolute ethanol to obtain oleic acid-modified TiO 2 0.316 g of nanoparticles, with an average particle diameter of 11.3 nm, was dispersed in 30 ml of toluene.

[0045] (2) Thiolated dendritic mesoporous SiO 2 preparation of

[0046] Dissolve 0.068g TEA in 25ml water, stir magnetically in an oil bath at 80°C for 30min, then add 0.38gCTAB and 0.168g NaSal and stir for 1h, then add 4ml TEOS, react for 4h, after the reaction, wash the product 3 times with absolute ethanol , then dissolved in 100ml of a mixed solution of hydrochloric acid and methanol (volume ...

Embodiment 3

[0052] (1) TiO modified with oleic acid 2 Preparation of nanoparticles

[0053] Add 4.53ml oleylamine, 10.5ml oleic acid, 3.43ml absolute ethanol, 1.021ml tetrabutyl titanate into a 50ml beaker, stir for 10min, then transfer to 50ml containing 11.77ml ethanol aqueous solution (volume concentration is 96%) In a tetrafluoroethylene-lined stainless steel reactor, react at 180°C for 14h. After the reaction, wash 3 times with absolute ethanol to obtain oleic acid-modified TiO 2 0.398 g of nanoparticles, with an average particle diameter of 10.3 nm, was dispersed in 30 ml of toluene.

[0054] (2) Thiolated dendritic mesoporous SiO 2 preparation of

[0055] Dissolve 0.068g TEA in 25ml water, stir magnetically in an oil bath at 80°C for 30min, then add 0.38gCTAB and 0.168g NaSal and stir for 1h, then add 4ml TEOS, react for 3h, after the reaction, wash the product 3 times with absolute ethanol , then dissolved in 100ml of a mixed solution of hydrochloric acid and methanol (volume ...

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Abstract

The invention discloses a multi-level double-pore structure composite photocatalyst, preparation and application thereof. The composite photocatalyst consists of a tree-shaped mesoporous SiO2 template, TiO2, Au nanoparticles and a mesoporous SiO2 shell layer. The invention overcomes the defect that conventional TiO2 catalyst can only degrade organic dye molecules in an ultraviolet waveband, effectively broadens the use conditions of TiO2 photocatalyst, and also utilizes the metal-semiconductor synergistic effect to inhibit photoelectron-hole recombination so as to improve the catalytic efficiency; the photocatalyst has a multi-level double-pore structure, greatly improves the openness of a catalytic site while enhancing the loading capacity of a functional element, facilitates the interaction of the photocatalyst and substrate molecules so as to improve the photocatalytic efficiency, meanwhile, the structure can improve the stability of the catalyst, and the catalyst can be repeatedlyand efficiently used, thus avoiding the waste of product.

Description

[0001] (1) Technical field [0002] The invention relates to a photocatalyst, in particular to a composite photocatalyst with a multi-level double hole structure and its preparation and application. [0003] (2) Background technology [0004] With the development of society and the improvement of human living standards, environmental problems have attracted more and more attention. Industrial wastewater seriously threatens people's health, and organic dye wastewater is one of the main industrial wastewater. Organic dyes mainly come from the printing and dyeing process of physical and chemical treatment of textiles. Organic dye wastewater has the characteristics of high concentration, large chroma, toxicity, and complex components, which makes the treatment of organic dye wastewater a difficult problem. At present, its treatment methods mainly include: chemical coagulation method, biological method, adsorption method, photocatalytic oxidation method, etc. Among them, photocatal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/10C02F1/30C02F101/34C02F101/36C02F101/38
CPCB01J23/52B01J23/002C02F1/30B01J2523/00C02F2101/308C02F2305/10C02F2101/34C02F2101/36C02F2101/38B01J35/60B01J35/647B01J35/39B01J2523/19B01J2523/41B01J2523/47
Inventor 黄亮蒲昊昊胡军
Owner ZHEJIANG UNIV OF TECH
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