Titanium dioxide with core-shell structure constructed by nanosheets and its preparation method and application

A technology of core-shell structure and titanium dioxide, which is applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of limited application, facilitate storage and penetration, improve structural stability, and improve monodispersity Effect

Inactive Publication Date: 2016-08-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, titanium oxide has no response in the visible light band due to its relatively wide bandgap, and photogenerated electron-hole pairs are prone to recombination, which limits its application in the field of photocatalysis.

Method used

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  • Titanium dioxide with core-shell structure constructed by nanosheets and its preparation method and application
  • Titanium dioxide with core-shell structure constructed by nanosheets and its preparation method and application
  • Titanium dioxide with core-shell structure constructed by nanosheets and its preparation method and application

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Effect test

Embodiment 1

[0039] Add 0.12 mL of tetraethylenepentamine into 84 mL of isopropanol, stir evenly, then add 3 mL of tetraisopropyl titanate into the above solution, and stir for 30 minutes. The above solution was transferred to a 150mL reactor and reacted at 200°C for 24 hours. Then the obtained product is repeatedly washed with ethanol, centrifuged, dried, and roasted at 400° C. for 2 hours to obtain the core-shell structure titanium dioxide constructed by nanosheets.

[0040] During this process, nanoparticles are formed first, and the nanoparticles agglomerate to form larger spherical particles. At the same time, under the action of the surfactant, a nanosheet structure is formed on the surface of the spherical particle. Then, after the Ostwald ripening process, the shell structure of the nanosheets continues to grow, the core structure continues to decrease, and an obvious cavity is formed between the two, and the required special structure of "core-cavity-shell" can be obtained. The ...

Embodiment 2

[0044] Add 0.03mL of tetraethylenepentamine into 84mL of isopropanol, stir evenly, then add 3mL of tetraisopropyl titanate into the above solution, and stir for 30 minutes. The above solution was transferred to a 150mL reactor and reacted at 200°C for 24 hours. Then the obtained product is washed with ethanol, centrifuged, dried, and calcined at 400° C. for 2 hours to obtain titanium dioxide with a core-shell structure constructed of nanosheets.

Embodiment 3

[0046] Add 0.06mL of tetraethylenepentamine into 84mL of isopropanol, stir evenly, then add 3mL of tetraisopropyl titanate into the above solution, and stir for 30 minutes. The above solution was transferred to a 150mL reactor and reacted at 200°C for 24 hours. Then the obtained product is washed with ethanol, centrifuged, dried, and calcined at 400° C. for 2 hours to obtain titanium dioxide with a core-shell structure constructed of nanosheets.

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Abstract

The invention provides a nanosheet-constructed titanium dioxide, and a preparation method and application thereof. The core-shell structure constructed by the nanosheet titanium dioxide includes a shell and a core; a cavity is formed between the shell and the core; the titanium dioxide with core-shell structure has a diameter of 800-1500 nm, the width of the core is 300-500nm, and the thickness of the shell is 200-300nm; the shell is composed of a large number of nano-sheets in self-assembly and the thickness of the nano-sheet is 2-5nm; and the crystal form is anatase phase. The invention employs a solvent thermal method to realize one-spot synthesis of the titanium dioxide with core-shell structure. The material can be used in lithium-ion battery cathode material, and has the advantages of high charge and discharge capacity, good rate capability and cycle stability. At the same time, the special structure can enhance the absorption and use of light and improve the photocatalytic activity; and the nanosheet-constructed titanium dioxide can be used in the fields of photocatalysis, photolysis of water for hydrogen production and dye-sensitized solar cell.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic materials, and in particular relates to a titanium dioxide with a core-shell structure constructed by nanosheets and a preparation method and application thereof. Background technique [0002] In recent years, inorganic nanomaterials with core-shell structure, due to their unique structural advantages, have broad application prospects in the fields of drug delivery, photocatalysis, clean energy conversion and storage, gas sensing, and separation of heavy metal ions. Ostwald ripening (Ostwald ripening) is a typical method for the synthesis of micron / submicron sized core-shell structures. During Ostwald ripening, the particles inside the crystalline structure are partially dissolved, then migrate to the surface and recrystallize, forming a micron / submicron core-shell structure with cavities. [0003] Titanium dioxide has the advantages of stable structure, stable chemical properties, non-tox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06C01G23/053B82Y30/00B82Y40/00
Inventor 李昱金俊黄绍专王超刘婧朱瑞威王洪恩吴旻陈丽华苏宝连
Owner WUHAN UNIV OF TECH
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