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Iron-doped TiO2-SiO2 composite aerogel, and preparation method and application thereof

A composite aerogel, iron-doped technology, applied in chemical instruments and methods, water/sludge/sewage treatment, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as harsh conditions, etc. To achieve the effect of mild reaction conditions, avoidance of loss, and simple reaction process

Active Publication Date: 2019-10-29
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of this, the purpose of the present invention is to overcome the existing iron-doped TiO 2 -SiO 2 Composite airgel hydrolysis and the shortcomings and shortcomings of supercritical drying technical conditions are relatively harsh, and a method for preparing iron-doped TiO by atmospheric pressure drying is provided. 2 -SiO 2 Composite airgel and its preparation method and application, the present invention solves the problem of iron-doped TiO 2 -SiO 2 Composite airgel hydrolysis and supercritical drying have strict requirements on conditions, etc.

Method used

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  • Iron-doped TiO2-SiO2 composite aerogel, and preparation method and application thereof
  • Iron-doped TiO2-SiO2 composite aerogel, and preparation method and application thereof
  • Iron-doped TiO2-SiO2 composite aerogel, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0038] (1) Prepare a solution with 0.02mL PEG (polyethylene glycol), 18.6mL absolute ethanol, 0.01g ferrocene and 0.01mL deionized water, and vigorously stir at 40°C with a temperature-controlled magnetic stirrer for 20 minutes;

[0039] (2) Add 1.42mL65.0~68.0(w / %) concentrated nitric acid, 8.9mL TEOS (tetraethyl orthosilicate), 3.5mL TIP (isopropyl titanate), 11.4mL HAc (glacial acetic acid), sealed and stirred at room temperature for 60min to form a mixed sol;

[0040] (3) Pour the mixed solution into a polypropylene tube and seal it, and age it at room temperature for 2 days to make it gel, then add TEOS / EtOH with a volume ratio of 1:1, and age the gel for 12 hours, and the aged Wash the gel with deionized water, put it into 0.5mol / L urea aqueous solution, and react it in a hydrothermal reactor at 120°C for 10 hours to make the surface of the gel hydrophilic;

[0041] (4) After the surface modification is completed, wash with n-hexane once every 12 hours for a total of tw...

Embodiment 2

[0044] (1) Prepare a solution with 0.02mL of PEG (polyethylene glycol), 18.6mL of absolute ethanol, 0.01g of ferrocene and 0.01mL of deionized water, and stir vigorously at 40°C for 20min with a temperature-controlled magnetic stirrer.

[0045] (2) Add 1.42mL65.0~68.0(w / %) concentrated nitric acid, 8.9mL TEOS (tetraethyl orthosilicate), 3.5mL TIP (isopropyl titanate), 11.4mL HAc (glacial acetic acid), sealed and stirred at room temperature for 60min to form a mixed sol.

[0046] (3) Pour the mixed solution into a polypropylene tube and seal it, and age it at room temperature for 2 days to make it gel. The generated gel was washed with deionized water, then put into 0.5 mol / L urea aqueous solution, and reacted in a hydrothermal reactor at 120°C for 10 hours to make the surface of the gel hydrophilic.

[0047] (4) After the surface modification is completed, wash with n-hexane once every 12 hours for a total of two times to replace the moisture in the gel, and then vacuum-dry a...

Embodiment 3

[0050] (1) Prepare a solution with 0.02mL PEG (polyethylene glycol), 18.6mL absolute ethanol, 0.02g ferrocene and 0.01mL deionized water, and stir vigorously at 40°C for 20min with a temperature-controlled magnetic stirrer.

[0051] (2) Add 1.42mL65.0~68.0(w / %) concentrated nitric acid, 8.9mL TEOS (tetraethyl orthosilicate), 3.5mL TIP (isopropyl titanate), 11.4mL HAc (glacial acetic acid), sealed and stirred at room temperature for 60min to form a mixed sol.

[0052] (3) Pour the mixed solution into a polypropylene tube and seal it, and age it at room temperature for 2 days to make it gel. The generated gel was washed with deionized water, then put into 0.5 mol / L urea aqueous solution, and reacted in a hydrothermal reactor at 120°C for 10 hours to make the surface of the gel hydrophilic.

[0053] (4) After the surface modification is completed, wash with n-hexane once every 12 hours for a total of two times to replace the moisture in the gel, and then vacuum-dry at 60°C for 2...

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Abstract

The invention discloses an iron-doped TiO2-SiO2 composite aerogel, and a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing PEG, absolute ethanol, ferrocene and deionized water at 40 DEG C under stirring to obtain mixed liquid; successively adding concentrated nitric acid with a concentration of 65.0-68.0 (w / %), TEOS, TIP and HAc intothe obtained mixed liquid, and carrying out hermetic stirring at room temperature for 60 min to form a mixed sol; subjecting the obtained mixed sol to hermetic aging and then to aging, and subjectingthe surface of the aged gel to ammoniation to obtain a hydrophilically modified gel; and washing the obtained hydrophilically modified gel with n-hexane, and carrying out hierarchical drying and calcination successively to obtain the iron-doped TiO2-SiO2 composite aerogel. The iron-doped TiO2-SiO2 composite aerogel provided by the invention is applied to degradation of reactive dyes, aromatic hydrocarbons or organic pesticides. The method of the invention avoids the hydrolysis of an inorganic iron salt in a sol liquid system, and prepares the iron-doped TiO2-SiO2 composite aerogel through atmospheric pressure drying, so the method is simple in reaction process and mild in reaction conditions.

Description

[0001] (1) Technical field [0002] The invention relates to an iron-doped TiO 2 -SiO 2 Composite airgel and its preparation method and application, in particular to a kind of iron-doped TiO 2 -SiO 2 Composite airgel, its preparation method, and its application in photocatalytic reaction. [0003] (2) Background technology [0004] Aerogels are a kind of gel material whose spatial network structure uses gas as the dispersion medium, so it is called aerogel. It is one of the lightest solid substances in the world, and its highly cross-linked continuous three-dimensional network structure has a porosity as high as 80% to 99.8%, and a density as low as 3kg / m 3 , translucent light blue, known as "solid smoke" or "frozen smoke". SiO 2 Aerogel is a common and well-researched airgel material. SiO 2 Airgel has a unique and adjustable structure and thermodynamic, photoelectric, and chemical properties, so it has a wide range of uses in catalysis, adsorption, filling, and thermal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/30C02F101/30
CPCB01J23/745C02F1/30C02F2101/308C02F2305/10B01J35/39
Inventor 张国亮茹瑞秦磊傅德龙
Owner ZHEJIANG UNIV OF TECH
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