An anatase tio 2 Preparation method of crystal facet heterojunction

An anatase-type, heterojunction technology, applied in chemical instruments and methods, hydrogen production, chemical/physical processes, etc., can solve problems that do not consider anatase-type TiO

Active Publication Date: 2020-10-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Anatase TiO prepared at present stage 2 The facet heterojunction mainly regulates the mutual ratio between {001} and {101} facets on an anatase single nanosheet with {001} facets exposed, and does not consider the exposure of {101} facets through compound growth. Anatase TiO 2 Nanoparticles in a heteroepitaxial relationship to obtain zero-dimensional / two-dimensional composite anatase TiO 2 facet heterojunction

Method used

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  • An anatase tio <sub>2</sub> Preparation method of crystal facet heterojunction
  • An anatase tio <sub>2</sub> Preparation method of crystal facet heterojunction
  • An anatase tio <sub>2</sub> Preparation method of crystal facet heterojunction

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Experimental program
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Effect test

Embodiment 1

[0027] 1) Measure 300 μL of tetra-n-butyl titanate and inject it into the liner of a reaction kettle containing 25 mL of absolute ethanol, and stir for 10-15 minutes to obtain an organic solution of tetra-n-butyl titanate;

[0028] 2) Under stirring, add 5 mL of ammonia water dropwise to the tetra-n-butyl titanate organic solution prepared in step 1), and stir for 10-20 minutes to obtain a milky white suspension;

[0029] 3) In the stirring state, add 5 mL of deionized water to the milky white suspension obtained in step 2), stir for 10-20 minutes, and the suspension continues to maintain milky white;

[0030] 4) Under stirring, 1 g of anatase TiO with exposed {001} facets 2 Add nanosheets to the milky white suspension obtained in step 3), stir for 2-3 hours, and the suspension will continue to maintain milky white;

[0031] 5) Put the reactor liner equipped with the reaction materials in step 4) into the reactor, seal it, and keep it warm at 200° C. for 12 hours. After the ...

Embodiment 2

[0034] 1) Measure 400 μL of tetra-n-butyl titanate and inject it into the liner of a reaction kettle containing 25 mL of absolute ethanol, and stir for 10-15 minutes to obtain an organic solution of tetra-n-butyl titanate;

[0035] 2) Under stirring, add 5 mL of ammonia water dropwise to the tetra-n-butyl titanate organic solution with different concentrations prepared in step 1), and stir for 10 to 20 minutes to obtain a milky white suspension;

[0036] 3) In the stirring state, add 5 mL of deionized water to the milky white suspension obtained in step 2), stir for 10-20 minutes, and the suspension continues to maintain milky white;

[0037] 4) Under stirring, 1 g of anatase TiO with exposed {001} facets 2 Add nanosheets to the milky white suspension obtained in step 3), stir for 2-3 hours, and the suspension will continue to maintain milky white;

[0038]5) Put the reactor liner equipped with the reaction materials in step 4) into the reactor, seal it, and keep it warm at 2...

Embodiment 3

[0041] 1) Measure 500 μL of tetra-n-butyl titanate and inject it into the liner of a reaction kettle containing 25 mL of absolute ethanol, and stir for 10-15 minutes to obtain an organic solution of tetra-n-butyl titanate;

[0042] 2) Under stirring, add 5 mL of ammonia water dropwise to the tetra-n-butyl titanate organic solution with different concentrations prepared in step 1), and stir for 10 to 20 minutes to obtain a milky white suspension;

[0043] 3) In the stirring state, add 5 mL of deionized water to the milky white suspension obtained in step 2), stir for 10-20 minutes, and the suspension continues to maintain milky white;

[0044] 4) Under stirring, 1 g of anatase TiO with exposed {001} facets 2 Add nanosheets to the milky white suspension obtained in step 3), stir for 2-3 hours, and the suspension will continue to maintain milky white;

[0045] 5) Put the reactor liner equipped with the reaction materials in step 4) into the reactor, seal it, and keep it warm at ...

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Abstract

The invention discloses a preparation method of an anatase type TiO2 crystal face heterojunction. The method includes: adopting hydrothermal reaction, using tetra-n-butyl titanate as the titanium source, taking anhydrous ethanol and deionized water as the solvent, employing ammonia water as the mineralizer, and utilizing {001} crystal face exposed anatase type TiO2 nanosheet as the composite substrate, performing intense agitation at room temperature, and then conducting hydrothermal treatment at high temperature, thus obtaining the anatase type TiO2 crystal face heterojunction. The inventionadopts a twice hydrothermal process to synthesize the anatase type TiO2 crystal face heterojunction for the first time. The preparation method provided by the invention has the characteristics of simple process, easily available conditions, no pollution and low cost, and is conducive to controllable preparation. The obtained composite material forms a high-quality heterojunction interface and shows good photocatalytic performance, and has wide potential application prospects in photodegradation, photolysis of water, photocatalytic reduction of CO2, and other environmental protection and energyfields.

Description

technical field [0001] The invention relates to an anatase type TiO 2 The invention relates to a preparation method of a crystal plane heterojunction, which belongs to the field of preparation of functional materials. Background technique [0002] Using TiO 2 As a photocatalyst, a series of photocatalytic reactions such as photodegradation, photocatalytic water splitting, and photocatalytic carbon dioxide reduction have attracted extensive attention from researchers and scientists. Some studies have found that anatase TiO 2 The (001) crystal plane and (101) crystal plane can effectively separate the photogenerated electrons and holes, and drive the photogenerated carriers to have a selective anisotropic flow of the crystal plane, so on the basis of the high exposure rate of the (001) crystal plane On the other hand, the proper introduction of (101) crystal planes to build a structure similar to a heterojunction will be more conducive to improving the TiO 2 photocatalytic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/06B01J35/02C01B3/04
CPCB01J21/063B01J35/004B01J35/023C01B3/042C01B2203/0277Y02E60/36
Inventor 任召辉阮罗渊李诗韩高荣
Owner ZHEJIANG UNIV
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