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Preparation method for layered double hydroxide (LDH) nanoscrolls

A layered bimetallic, hydroxide technology, applied in chemical instruments and methods, nanotechnology, nickel compounds, etc., can solve the problems of high reaction temperature, high energy consumption and danger, achieve large specific surface area, avoid agglomeration, The effect of less impurities

Active Publication Date: 2015-11-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reaction temperature of this method is too high, the energy consumption is large and there is certain danger.

Method used

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  • Preparation method for layered double hydroxide (LDH) nanoscrolls
  • Preparation method for layered double hydroxide (LDH) nanoscrolls
  • Preparation method for layered double hydroxide (LDH) nanoscrolls

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] In 11 mL of n-hexanol, add 11 g of cetyltrimethylammonium bromide and stir to dissolve. Add 50mL of n-hexane into the system and stir for 30min to obtain a uniform and stable emulsion suspension system.

[0046] In 5 mL deionized water, add 0.105 g CoSO 4 with 0.04gAl 2 (SO 4 ) 3 , stirred to dissolve and added dropwise to the above suspension system. In 5 mL of deionized water, add 0.27 g of urea, dissolve it and add it dropwise to the above system and keep stirring for 1 h to obtain a clear and transparent microemulsion system.

[0047] The above-mentioned microemulsion system was transferred to a hydrothermal kettle, and placed in a vacuum oven for crystallization at 95° C. for 12 hours. After the reaction was completed, it was taken out after cooling down to room temperature, washed several times by centrifugation with ethanol and deionized water respectively, and finally freeze-dried to obtain a layered double metal hydroxide.

[0048] The XRD spectrogram of ...

Embodiment 2

[0051] In 11 mL of n-hexanol, add 11 g of cetyl dimethyl benzyl ammonium chloride and stir to dissolve. Add 50mL of n-hexane into the system and stir for 30min to obtain a uniform and stable emulsion suspension system.

[0052] In 5 mL deionized water, add 0.105 g CoSO 4 with 0.04gAl 2 (SO 4 ) 3 , stirred to dissolve and added dropwise to the above suspension system. In 5 mL of deionized water, add 0.27 g of urea, dissolve it and add it dropwise to the above system and keep stirring for 3 hours to obtain a clear and transparent microemulsion system.

[0053] The above-mentioned microemulsion system was transferred to a hydrothermal kettle, and placed in a vacuum oven for crystallization at 110° C. for 15 hours. After the reaction was completed, it was taken out after cooling down to room temperature, washed several times by centrifugation with ethanol and deionized water respectively, and finally freeze-dried to obtain a layered double metal hydroxide.

[0054] The XRD s...

Embodiment 3

[0057] In 11 mL of n-hexanol, add 12 g of tetradecyldimethylbenzyl ammonium bromide and stir to dissolve. Add 50mL of n-hexane into the system and stir for 30min to obtain a uniform and stable emulsion suspension system.

[0058] In 15 mL deionized water, add 0.105 g CoSO 4 with 0.04gAl 2 (SO 4 ) 3 , stirred to dissolve and added dropwise to the above suspension system. In 5 mL of deionized water, add 0.27 g of urea, dissolve it, add it dropwise to the above system and keep stirring for 1 h to obtain a clear and transparent microemulsion system.

[0059] The above-mentioned microemulsion system was transferred to a hydrothermal kettle, and placed in a vacuum oven for crystallization at 125° C. for 30 h. After the reaction was completed, it was taken out after cooling down to room temperature, washed several times by centrifugation with ethanol and deionized water respectively, and finally freeze-dried to obtain a layered double metal hydroxide.

[0060] The XRD spectrum ...

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Abstract

The invention discloses a preparation method for layered double hydroxide (LDH) nanoscrolls. The preparation method specifically comprises the following steps: uniformly mixing a cationic surface active agent, a cosurfactant and an alkanes oil phase at room temperature to obtain a uniform and stable emulsus suspension system; then mixing a soluble bivalent metal salt and a soluble trivalent metal salt with deionized water, and adding the mixture to the emulsus suspension system to obtain a microemulsion system; and finally mixing an alkaline substance with deionized water, then adding the mixture to the microemulsion system, continuously stirring for 0.5-5 hours, and carrying out a hydrothermal reaction at 75-130 DEG C for 2-60 hours to obtain the LDH nanoscrolls. According to the preparation method disclosed by the invention, oligolamellar LDH is generated by means of the mutual action of LDH growth units and a drop film interface under a microemulsion condition, and is further folded to form the LDH nanoscrolls. The preparation method disclosed by the invention is mild in reaction conditions, simple and feasible and short in time consumption; the LDH nanoscrolls synthesized by the preparation method are regular in shape and favorable in dispersity.

Description

technical field [0001] The invention relates to the field of preparation of inorganic materials, in particular to a preparation method of layered double metal hydroxide nanorolls. Background technique [0002] Layered double hydroxides (Layered Double Hydroxides, abbreviated as LDH) are a class of hydrotalcite compounds with exchangeable anions between layers, and the composition can be expressed by the following general formula: [M 2+ 1-x m 3+ x (OH) 2 ](A n- ) x / n mH 2 O, where M 2+ , M 3+ are the divalent and trivalent metal cations located in the octahedral voids of the main laminate, respectively, A n- It is an anion located between layers that can exist stably in alkaline solution. There are strong covalent bonds between the main layers of the double metal hydroxide, and a weak interaction force between the layers. The host and object are combined by hydrogen bonds, van der Waals forces, and electrostatic forces. [0003] Layered double hydroxides have a mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G51/00C01G49/00C01G53/00B82Y40/00
Inventor 杜淼吕维扬叶维娟郑强
Owner ZHEJIANG UNIV
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