Green preparation method of two-dimensional hydroxide nano-sheets

A hydroxide and nanosheet technology, applied in the directions of nickel oxide/nickel hydroxide, cobalt oxide/cobalt hydroxide, iron oxide/iron hydroxide, etc. Macro-scale preparation, low stripping efficiency and other problems, to achieve good prospects for industrial synthesis, easy to scale up synthesis, and save energy costs.

Inactive Publication Date: 2018-07-20
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] "Top-down" mechanical exfoliation (ultrasonic exfoliation and solid / liquid phase shear force exfoliation) of layered hydroxide macroscopic materials is currently a general method for preparing two-dimensional hydroxide nanosheets, but due to The low stripping efficiency makes this method also face cumbersome post-processing procedures such as heavy separation and purification, so it is difficult to be used in low-cost macro-preparation (F.Song, X.L.Hu, Nat.Commun.2014,5,4477.)
Wet chemical synthesis methods with macrofabrication potential, such as hydrothermal and chemical deposition, have recently achieved remarkable progress in the preparation of 2D hydroxide nanosheets and have received much attention, but existing synthetic strategies still require the use of high temperature Conditions such as , high pressure and surfactant are still limited in terms of energy consumption, cost and scale (H.J.Yin, Z.Y.Tang, Chem.Soc.Rev.2016,45,4873)

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) In a 1L glass beaker, add 10g of nickel nitrate nonahydrate into 1L of water and dissolve until clear.

[0033] (2) Add 10 g of commercial magnesium oxide nanopowder to the clarified solution prepared in step (1), ultrasonically disperse for 10 min, then continue to stir at room temperature, and then let stand at room temperature after 1 h.

[0034] (3) Wash the precipitate in step (2) with water and ethanol repeatedly for 3 times.

[0035] (4) The precipitate obtained in step (3) was dried at 60° C. for 12 hours to obtain the target product.

[0036] From figure 1 and 2 It can be seen that the obtained product is a uniform ultrathin nanosheet structure, image 3 further pointing out that the thickness of these ultrathin nanosheets is about 1.3 nm, Figure 4 It shows that the crystallinity of the obtained product is good, with typical α-Ni(OH) 2 structure, without other impurity phases, the resulting two-dimensional Ni(OH) 2 The nanosheets have the characteris...

Embodiment 2

[0038] (1) In a 1L glass beaker, add 10g of cobalt chloride hexahydrate into 1L of water and dissolve until clear.

[0039] (2) Add 10 g of commercial magnesium oxide nanopowder to the clarified solution prepared in step (1), ultrasonically disperse for 10 min, then continue to stir at room temperature, and then let stand at room temperature after 1 h.

[0040] (3) Wash the precipitate in step (2) with water and ethanol repeatedly for 3 times.

[0041] (4) The precipitate obtained in step (3) was dried at 60° C. for 12 hours to obtain the target product.

[0042] From Figure 5 It can be seen that the obtained product is a uniform ultrathin two-dimensional cobalt hydroxide nanosheet.

Embodiment 3

[0044] (1) In a 1L glass beaker, add 10g of ferrous sulfate heptahydrate into 1L of water and dissolve until clear.

[0045] (2) Add 10 g of commercial magnesium oxide nanopowder to the clarified solution prepared in step (1), ultrasonically disperse for 10 min, then continue to stir at room temperature, and then let stand at room temperature after 1 h.

[0046] (3) Wash the precipitate in step (2) with water and ethanol repeatedly for 3 times.

[0047] (4) The precipitate obtained in step (3) was dried at 60° C. for 12 hours to obtain the target product.

[0048] From Figure 6 It can be seen that the obtained product is a uniform ultrathin two-dimensional iron hydroxide nanosheet.

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Abstract

The invention provides a green preparation method of two-dimensional hydroxide nano-sheets, and relates to two-dimensional nano-materials. Metal salt is added into a solvent, and a settled solution isobtained after the metal salt is dissolved; an oxide medium is added into the prepared settled solution, ultrasonic dispersion is carried out, the material is stirred, and a product stands still; water for precipitation and ethyl alcohol are taken for repeated cleaning; after the product is dried, loose powder, namely the two-dimensional hydroxide nano-sheets, is obtained. A hydrolysis reaction of oxide particles can be used for replacing traditional soluble alkali at room temperature, specific metal cations are added, and by means of the chemical reaction between the metal cations and the surfaces of the oxide particles, the two-dimensional hydroxide nano-sheets corresponding to added metal are directly generated. In the solution, the oxide medium is used for replacing the traditional soluble alkali, and the two-dimensional hydroxide nano-sheets are prepared through interaction of the added transition metal cations and the surface of the oxide medium.

Description

technical field [0001] The invention relates to a two-dimensional nanometer material, in particular to a green preparation method of a two-dimensional hydroxide nanosheet at room temperature using an oxide as a medium. Background technique [0002] Due to their excellent electrical, optical, thermal, and mechanical properties, two-dimensional nanomaterials have shown important application value in many fields such as materials, energy, electronics, environment, and biomedicine (C.L.Tan, X.H.Cao, X.J.Wu, Q. Y. He, J. Yang, X. Zhang, J. Chen, W. Zhao, S. K. Han, G. H. Nam, M. Sindoro, H. Zhang, Chem. Rev. 2017, 117, 6225). Among them, two-dimensional hydroxide nanosheets are widely used in energy storage and conversion, catalysis, sensing, and biology due to their high specific surface area, abundant surface defects, and electronic effects. In addition, 2D hydroxide nanosheets are also an important precursor. It can obtain two-dimensional oxide and sulfide nanosheets through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/04C01G51/04C01G49/02
CPCC01G53/04C01G49/02C01G51/04C01P2002/72C01P2004/03C01P2004/04
Inventor 方晓亮郑宗敏林乐乐欧道辉
Owner XIAMEN UNIV
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