Two-dimensional titanate nanometer material and preparation method thereof

A nanomaterial, titanate technology, applied in the field of photocatalysis, can solve the problem of low light utilization rate, and achieve the effect of improving photocatalytic efficiency, large surface area, and not easy to curl

Active Publication Date: 2016-07-27
BYD CO LTD
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  • Abstract
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Problems solved by technology

[0006] The purpose of the present invention is to improve the problem that the light absorption bandwidth of the existing two-dimensional titanate nanomaterial is only in the ultraviolet region, and the utilization rate of light is not high, and to provide a two-dimensional titanate nanomaterial and its preparation method

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  • Two-dimensional titanate nanometer material and preparation method thereof
  • Two-dimensional titanate nanometer material and preparation method thereof
  • Two-dimensional titanate nanometer material and preparation method thereof

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preparation example Construction

[0030] In a preferred embodiment of the present invention, also provides a kind of preparation method of two-dimensional titanate nanomaterial, this preparation method comprises the following steps: with alkali metal carbonate and amorphous TiO 2 As a raw material, prepare protonated layered titanate; under heat treatment conditions, make protonated titanate contact with dichromate to form Cr-doped layered titanate; under stirring conditions, make the obtained The protonated layered titanate reacts with the organic amine in the liquid matrix to form the two-dimensional titanate nanomaterial by exfoliation.

[0031] In the above-mentioned method provided by the present invention, the Cr element doped in the titanate lattice of the prepared two-dimensional titanate nanomaterial is obtained by contacting and reacting protonated titanate and dichromate by means of heat treatment. , thereby enhancing the stability of the titanate lattice, and broadening the absorption bandwidth of ...

Embodiment 1

[0048] (1), the preparation method of two-dimensional titanate nanomaterials includes:

[0049] (1) by selecting sodium carbonate (analytical pure) and amorphous TiO 2 (analytical pure) is raw material, the two are mixed and ground by 1:5.3 molar ratio, form the mixed powder that average particle size is 400nm;

[0050] (2) calcining the mixed powder at 700°C for 40 hours to carry out high-temperature solid-state reaction to prepare layered titanate powder in advance;

[0051] (3) Add the layered titanate to a hydrochloric acid solution (analytical pure) with a concentration of 1mol / L and stir and pickle it for 15 hours. The amount of hydrochloric acid added to each gram of layered titanate is 75ml, and after pickling three times, the sample Washing to neutrality, drying and filtering to obtain protonated layered titanate;

[0052] (4) Add ammonium dichromate (the weight ratio of ammonium dichromate to protonated layered titanate is 0.6:1) to the dried protonated titanate, h...

Embodiment 2

[0070] (1), the preparation method of two-dimensional titanate nanomaterials includes:

[0071] (1) By selecting rubidium carbonate (analytical pure) and amorphous TiO 2 (analytical pure) is raw material, the two are mixed and ground by 1:3.3 molar ratio, form the mixed powder that average particle size is 400nm;

[0072](2) calcining the mixed powder at 1100° C. for 30 hours to carry out high-temperature solid-state reaction to prepare layered titanate powder in advance;

[0073] (3) Add the layered titanate to a hydrochloric acid solution (analytical pure) with a concentration of 1mol / L and stir and pickle it for 25 hours. The amount of hydrochloric acid added per gram of the layered titanate is 80ml. After pickling three times, the sample Washing to neutrality, drying and filtering to obtain protonated layered titanate;

[0074] (4) Add ammonium dichromate (the weight ratio of ammonium dichromate to the protonated layered titanate is 25:100) to the dried protonated titana...

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Abstract

The invention discloses a two-dimensional titanate nanometer material and a preparation method thereof. The two-dimensional titanate nanometer material comprises a modified protonated titanate film which comprises organic groups and a doped Cr element. Through the doped Cr element which facilitates to broadening absorption bandwidth of the two-dimensional titanate nanometer material, the two-dimensional titanate nanometer material can absorb ultraviolet light and visible light, and greatly improves efficiencies of light absorption and photoelectric conversion, thereby improving photocatalytic efficiency. Meanwhile, through doping of the organic groups which are relatively large molecules and are used as a balance medium of nanometer sheets, the prepared two-dimensional titanate nanometer material is not easy to curl and has relatively-stable two-dimensional structure and relatively-large surface area, thereby further improving photocatalytic efficiency.

Description

technical field [0001] The invention relates to the field of photocatalysis, in particular to a two-dimensional titanate nanomaterial and a preparation method thereof. Background technique [0002] Layered compounds are excellent adsorbents for harmful ions and gases, and can be used as highly active composite catalysts and catalyst supports for inorganic substances, which can split water; The chemical reaction provides a nanoscale reaction space, and at the same time, the stripped nanoscale monolithic layer can be used as the basic unit of other nanostructures. [0003] The structure of inorganic layered compounds is that two-dimensional laminates are arranged longitudinally and orderly to form a three-dimensional crystal structure. Most of the atoms in the laminates are covalently bonded, and the interlayers are van der Waals forces or weak chemical ionic bonds. The distance between layers is generally several nanometers. between. Titanate nanocrystal is a wide-bandgap s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/00B01J21/06B82Y30/00
Inventor 詹燕妹
Owner BYD CO LTD
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