Method for growing laminated double-metal hydroxide on surface of any substrate

A layered bimetallic, hydroxide technology, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of difficulty in ensuring the regularity of LDH nano-rolls, large environmental impact, and cumbersome operations, so as to shorten the preparation time. Long-lasting, widely applicable, easy-to-use effects

Inactive Publication Date: 2017-12-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Regarding the controllable preparation of layered double hydroxide nanovolumes, in existing research reports, Wan et al. LDH nanoscrolls were synthesized in a water / ethanol mixed solvent by the hydrothermal method, but most of the LDH still existed in the form of flakes in the TEM image, and the agglomeration was serious
In addition, well-dispersed LDH nanoscrolls can be obtained by the three-phase hydrothermal method (W.Y.Lv, M.Du, W.J.Ye, Q.Zheng, J.Mater.Chem.A, 2015, 3, 23395.), but this The method needs to add a large amount of organic solvents and surfactants, which has a great impact on the environment; at the same time, the droplets will aggregate and separate from each other during the synthesis process, making it difficult to ensure the regularity of LDH nanovolumes
More importantly, the product obtained by the three-phase hydrothermal method is in the form of powder, which needs to be deposited on a specific substrate to form a complete device, and the operation is cumbersome

Method used

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  • Method for growing laminated double-metal hydroxide on surface of any substrate
  • Method for growing laminated double-metal hydroxide on surface of any substrate
  • Method for growing laminated double-metal hydroxide on surface of any substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 0.1 g of dopamine and 0.1 g of polyethyleneimine with a molecular weight of 600 were added to 50 mL of an aqueous solution of tris with a concentration of 10 mmol / L and stirred to dissolve. The silica fiber membrane was immersed in the above solution and shaken for 12 hours, so that the silica surface was uniformly covered with a dopamine / polyethyleneimine modified layer.

[0032] In 50mL deionized water, add 1.55g CoSO 4 , 0.4g Al 2 (SO 4 ) 3 And 2.592g urea was stirred and dissolved. Add the surface-modified silica fiber membrane into the above solution and fully immerse.

[0033] The above system was moved into a hydrothermal kettle, and placed in a vacuum oven for crystallization at 105°C for 3h. After the reaction is finished, take it out after cooling down to room temperature, wash it several times with deionized water, and finally dry it in vacuum to obtain a silica fiber membrane with layered double metal hydroxide grown on the surface.

[0034] The XRD sp...

Embodiment 2

[0037] 0.2 g of dopamine and 0.1 g of polyethyleneimine with a molecular weight of 600 were added to 50 mL of an aqueous solution of tris with a concentration of 45 mmol / L and stirred to dissolve. The silica fiber membrane was immersed in the above solution and shaken for 10 h, so that the silica surface was uniformly covered with a dopamine / polyethyleneimine modified layer.

[0038] In 50mL deionized water, add 1.6g CoSO 4 , 0.5g Al 2 (SO 4 ) 3 and 1.85g of urea were stirred and dissolved. Add the surface-modified silica fiber membrane into the above solution and fully immerse.

[0039] The above system was moved into a hydrothermal kettle, and placed in a vacuum oven for crystallization at 108°C for 6h. After the reaction is finished, take it out after cooling down to room temperature, wash it several times with deionized water, and finally dry it in vacuum to obtain a silica fiber membrane with layered double metal hydroxide grown on the surface.

[0040] The XRD spec...

Embodiment 3

[0043] 0.15 g of dopamine and 0.2 g of polyethyleneimine with a molecular weight of 1800 were added to 50 mL of an aqueous solution of tris with a concentration of 10 mmol / L and stirred to dissolve. The silica fiber membrane was immersed in the above solution and shaken for 10 h, so that the silica surface was uniformly covered with a dopamine / polyethyleneimine modified layer.

[0044] In 50 mL of deionized water, add 1.3 g of CoCl 2 , 0.35g AlCl 3 And 2.49g urea was stirred and dissolved. Add the surface-modified silica fiber membrane into the above solution and fully immerse.

[0045] The above system was moved to a hydrothermal kettle, and placed in a vacuum oven for crystallization at 110° C. for 12 hours. After the reaction is finished, take it out after cooling down to room temperature, wash it several times with deionized water, and finally dry it in vacuum to obtain a silica fiber membrane with layered double metal hydroxide grown on the surface.

[0046] The XRD s...

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Abstract

The invention discloses a method for growing laminated double-metal hydroxides on the surface of any substrate. The method comprises the following steps: (1) dissolving dopamine and polyethyleneimine in a buffer solution, soaking a substrate into the solution, and performing oscillation deposition so as to obtain a dopamine / polyethyleneimine modified substrate; and (2) soaking the surface modified substrate obtained in the step (1) into a solution of soluble divalent metal salts, soluble trivalent metal salts and alkali substances, and performing a hydrothermal reaction for 1-24 hours at 90-120 DEG C, thereby obtaining a composite material that laminated double-metal hydroxides are uniformly grown on the surface of the substrate. The method disclosed by the invention is simple and convenient to operate and wide in application, and the preparation time of an LDH (Lactate Dehydrogenase) functional device is effectively shortened; and in addition, as no organic solvent or surfactant is used, the cost is relatively low, and the environment is not polluted.

Description

technical field [0001] The invention relates to the field of preparation of inorganic materials, in particular to a method for growing layered double metal hydroxides on any surface. Background technique [0002] Realizing the shape control of nanocrystals has always been a research hotspot in the field of materials. The discovery of carbon nanotubes has drawn widespread attention to one-dimensional tubular materials, and their applications have covered catalysis, electronics, magnetism, and optics. At present, a series of tubular materials, such as carbon tubes, nickel tubes, and titanium dioxide tubes, have been successfully prepared by hydrothermal method and intercalation exfoliation method, but one-dimensional layered double hydroxides (Layered Double Hydroxides, abbreviated as for LDH). LDH is a class of hydrotalcite compounds with exchangeable anions between layers, and its composition can be expressed by the following general formula: [M 2+ 1-x m 3+ x (OH) 2 ]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/00
CPCC01P2004/03C01P2002/72C01P2004/61C01F7/785
Inventor 杜淼吕维扬梅清青郑强
Owner ZHEJIANG UNIV
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