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Hollow double-shell titania nanoparticles and their applications

A technology of titanium dioxide and nanoparticles, which is applied in the direction of nanotechnology, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as harsh conditions and increased complexity, so as to improve adsorption capacity, photocatalytic efficiency, and photocatalytic effect of effect

Active Publication Date: 2020-02-11
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these methods require measures such as chemical reducing agents or photoinitiators, and the conditions are relatively harsh.
However, in order to ensure the stable combination of metal nanoparticles and the template structure, these two methods generally need to pre-modify the template structure and introduce groups that interact strongly with the metal, thus increasing the complexity of the preparation.

Method used

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  • Hollow double-shell titania nanoparticles and their applications
  • Hollow double-shell titania nanoparticles and their applications
  • Hollow double-shell titania nanoparticles and their applications

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Preparation steps of modified polydopamine nanoparticles: Take 20mL of ultrapure water, 10mL of absolute ethanol, and 200uL of ammonia, mix and place in a beaker, stir at room temperature for 30min, record as solution A; Dissolve 0.05g of dopamine hydrochloride in 3mL of water , Marked as solution B; quickly pour solution B into solution A, the color of the reaction solution immediately changed from colorless to light brown, and the reaction was stirred at room temperature for 24h. After the reaction, the liquid was black, centrifuged, washed with water three times, and re-dispersed in 30 mL of ultrapure water, denoted as dispersion C.

[0033] (2) Preparation steps of polydopamine spheres coated with silver particles: prepare 10 mL of a silver nitrate aqueous solution with a concentration of 1 mg / mL, and slowly drop a dilute ammonia solution with a mass concentration of 2% into it. The system changes first during the dropping process After the turbidity is clear, when...

Embodiment 2

[0038] (1) Preparation steps of modified polydopamine nanoparticles: take 20mL of ultrapure water, 12mL of absolute ethanol, and 300uL of ammonia, mix and place in a beaker, stir at room temperature for 30min, record as solution A; dissolve 0.1g of dopamine hydrochloride in 3mL of water , Marked as solution B; quickly pour solution B into solution A, the color of the reaction solution immediately changed from colorless to light brown, and the reaction was stirred at room temperature for 24h. After the reaction, the liquid was black, centrifuged, washed with water three times, and re-dispersed in 30 mL of ultrapure water, denoted as dispersion C.

[0039] (2) Preparation steps of polydopamine spheres coated with silver particles: prepare 10 mL of a silver nitrate aqueous solution with a concentration of 10 mg / mL, and slowly drop a dilute ammonia solution with a mass concentration of 2% into it. The system changes first during the dropping process After the turbidity is clear, when...

Embodiment 3

[0044] (1) Preparation steps of modified polydopamine nanoparticles: take 20mL of ultrapure water, 12mL of absolute ethanol, and 300uL of ammonia, mix and place in a beaker, stir at room temperature for 30min, record as solution A; dissolve 0.1g of dopamine hydrochloride in 3mL of water , Marked as solution B; quickly pour solution B into solution A, the color of the reaction solution immediately changed from colorless to light brown, and the reaction was stirred at room temperature for 24h. After the reaction, the liquid was black, centrifuged, washed with water three times, and re-dispersed in 30 mL of ultrapure water, denoted as dispersion C.

[0045] (2) Preparation steps of polydopamine spheres coated with gold particles: prepare 10 mL of chloroauric acid aqueous solution with a concentration of 10 mg / mL, and record it as solution D. Solution D was slowly added dropwise to a beaker containing 30 mL of dispersion C obtained in the previous step, and then ultrasonically reacte...

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Abstract

The invention provides a hollow double-shell titanium dioxide nanoparticle modified with metal nanoparticles. The inner layer of the hollow titanium dioxide nanoparticle is evenly distributed with metal nanoparticles of uniform size, and the outer layer is covered with a polydopamine shell, thereby forming a hollow double-shell. Structured titanium dioxide visible light catalyst. The hollow structure of the nanoparticles prepared by the present invention effectively improves the adsorption capacity of the nanoparticles, and its extremely large specific surface area greatly increases the contact area between the dye and the titanium dioxide nanoparticles. It can effectively improve the catalytic efficiency, and the efficiency is increased by 2-3 times compared to non-hollow structures.

Description

Technical field [0001] The invention belongs to the technical field of molecular material preparation, and specifically relates to a hollow double-shell titanium dioxide nanoparticle, and a preparation method and application thereof. Background technique [0002] Water is the source of life, and water pollution is closely related to human life and health. The treatment of water pollution not only requires remediation from the source, but also the solution of organic pollutants that already exist in the water. Photocatalytic degradation is one of the important ways to treat organic pollutants in water. One. [0003] Titanium Dioxide (TiO 2 ) Is one of the most basic standard catalysts. It has many advantages such as effectiveness, non-toxicity, low cost, stability, acid and alkali resistance, environmental protection and sterilization. Therefore, it stands out among the semiconductor photocatalytic materials. Titanium dioxide shows a good catalytic effect under the irradiation of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/06C02F1/30B82Y40/00B01J31/38B01J35/02C02F101/30C02F101/34C02F101/38B01J35/00
CPCB01J13/06B82Y40/00C02F1/30B01J31/38C02F2101/308C02F2101/38C02F2101/34C02F2305/10B01J21/063B01J31/06B01J35/19B01J35/50B01J35/39
Inventor 马洪超李硕姜磊郭天铠
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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