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Preparation method and application of {001} crystal face exposed porous titanium dioxide nanosheet

A technology of porous titanium dioxide and titanium dioxide, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of poor product morphology or performance, complicated process, high risk, etc., and achieve excellent photocatalytic performance , The preparation method is simple and the effect of easy operation

Active Publication Date: 2020-06-12
CHINA UNIV OF MINING & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method and application of porous titanium dioxide nanosheets with exposed {001} crystal faces, so as to solve the problems of high risk, long time, complicated process, morphology or performance of the obtained product in general preparation methods. bad question

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  • Preparation method and application of {001} crystal face exposed porous titanium dioxide nanosheet
  • Preparation method and application of {001} crystal face exposed porous titanium dioxide nanosheet
  • Preparation method and application of {001} crystal face exposed porous titanium dioxide nanosheet

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Embodiment 1

[0060] Example 1: Accurately measure 20 mL of cyclohexanol, add 2 mmol of hexafluorotitanic acid and 2.5 mmol of tetrabutyl titanate in sequence, stir and dissolve to obtain a milky white solution; transfer the above solution to a closed, pressure-resistant homogeneous reaction vessel In the process, react at 180°C for 150 minutes at a rotation speed of 300 rpm; after the product is rapidly cooled to room temperature, it is repeatedly washed with deionized water and absolute ethanol, centrifuged, and dried in a vacuum to obtain a pure white powder product.

[0061] The product was subjected to Bruker D8 ADVANCE X-ray powder diffractometer (Cu Kα ray, wavelength The scanning step is 0.08° / sec) identified as anatase TiO 2 powder( figure 1 ), matched with the JCPDS card standard value (No.21-1272), and no other impurity peaks appeared.

[0062] Observation of anatase TiO by SU-8200 scanning electron microscope 2 The morphology of the nanosheets, the results are as follows f...

Embodiment 2

[0067] Example 2: Accurately measure 15 mL of cyclohexanol, add 1 mmol of hexafluorotitanic acid and 3 mmol of tetrabutyl titanate in sequence, stir and dissolve to obtain a milky white solution; transfer the above solution to a closed, pressure-resistant homogeneous reaction vessel , at a rotation speed of 300rpm, reacted at 200°C for 180min; after the product was rapidly cooled to room temperature, washed repeatedly with deionized water and acetone, centrifuged, and then freeze-dried to obtain a pure white powder product.

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Abstract

The invention discloses a preparation method and application of a {001} crystal face exposed porous titanium dioxide nanosheet, and belongs to a preparation method and application of a semiconductor photocatalytic material. The invention specifically relates to a method for preparing a {001} crystal face exposed porous titanium dioxide nanosheet in a cyclohexanol-hexafluorotitanic acid-tetrabutyltitanate reaction system, and application of the {001} crystal face exposed porous titanium dioxide nanosheet as a semiconductor material in the aspect of hydrogen evolution reaction of photocatalyticdecomposition of water. The method comprises the following steps: dissolving hexafluorotitanic acid and tetrabutyl titanate in cyclohexanol; adding the obtained solution into a closed homogeneous reaction container for reaction; and after the reaction is finished, quickly cooling the reaction product, and separating, washing and drying the reaction product to obtain a target product. The method is simple and convenient in process and good in repeatability, and the obtained product is high in purity, good in dispersity and uniform and controllable in size distribution, has a nano-porous structure and a high {001} crystal face exposure ratio, and is expected to be produced on a large scale. The titanium dioxide nanosheet is used as a photocatalytic material and has excellent hydrolysis hydrogen evolution performance, so that the titanium dioxide nanosheet has good economic benefits and a relatively wide market prospect.

Description

technical field [0001] The invention relates to a preparation method and application of a semiconductor photocatalytic material, in particular to a preparation method and application of porous titanium dioxide nanosheets with exposed {001} crystal planes. Background technique [0002] As an important oxide semiconductor material, titanium dioxide (TiO 2 ) has been widely used in many fields such as environment, energy, chemical industry, life science and so on. For TiO 2 For photocatalysts, many physical and chemical processes take place on the surface, and the photocatalytic performance largely depends on its surface structure. Studies have shown that anatase TiO 2 The photocatalytic performance of materials in the degradation of organic pollutants and water splitting depends largely on the type and proportion of crystal exposed surfaces. Generally speaking, anatase TiO 2 The {101} plane has the lowest surface energy (0.44Jm -2 ) and better dynamic stability, so it is...

Claims

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Application Information

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IPC IPC(8): C01G23/053B82Y40/00B01J21/06B01J35/10C01B3/04
CPCC01G23/053B82Y40/00B01J21/063C01B3/042C01P2004/20C01P2006/16C01P2002/72C01P2004/03C01P2004/04B01J35/40B01J35/61Y02E60/36
Inventor 王鹏金永生滕淑华
Owner CHINA UNIV OF MINING & TECH
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