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Method for synthesizing hydrotalcite like compound nano particles by room temperature solid phase method

A nanoparticle, room temperature solid phase technology, applied in nanotechnology, oxide/hydroxide preparation and other directions, can solve the problems of uneven agglomeration of crystal forms of hydrotalcite-like products, achieve good monodispersity, simple operation process, Reliable effect of preparation method

Inactive Publication Date: 2011-08-31
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is to provide a method for synthesizing hydrotalcite-like nanoparticles by a room-temperature solid-phase method. Uneven crystal shape, severe agglomeration and other problems, synthesized hydrotalcite-like nanoparticles with good dispersion and uniform size, greatly expanding the industrial application of hydrotalcite-like

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  • Method for synthesizing hydrotalcite like compound nano particles by room temperature solid phase method
  • Method for synthesizing hydrotalcite like compound nano particles by room temperature solid phase method
  • Method for synthesizing hydrotalcite like compound nano particles by room temperature solid phase method

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Embodiment 1

[0034] Adopt the inventive method to synthesize Mg 3 -Al-CO 3 - LDH nanoparticles, comprising the steps of:

[0035] (1) At room temperature, the Mg(NO 3 ) 2 ?6H 2 O, Al(NO 3 ) 3 ?9H 2 O, Na 2 CO 3 Pre-grind with NaOH for 2min, then weigh 0.7692g Mg(NO 3 ) 2 ?6H 2 O and 0.3751g Al(NO 3 ) 3 ?9H 2 O (the molar ratio of substances is 3:1), add to contain 0.0596g Na 2 CO 3In a mortar mixed with 0.36g NaOH (Na 2 CO 3 The molar ratio of NaOH to NaOH is 1:16), manually grind at a constant speed for 30-100min, until the mixture is dry. Centrifuge and wash with distilled water for 3 to 4 times to obtain the nano-LDH precursor.

[0036] (2) Disperse the precursor in 20ml double-distilled water, put it in an oven, and peptize it at 80°C for 20 hours, and then get Mg with regular shape and good dispersion 3 -Al-CO 3 - LDH Serum.

[0037] (3) Mg 3 -Al-CO 3 -LDH slurry is vacuum dried to obtain Mg 3 -Al-CO 3 - LDH nanomaterials.

[0038] The resulting Mg 3 -Al-CO...

Embodiment 2

[0041] Synthesize Mg according to the method identical with embodiment 1 2 -Al-CO 3 -LDH nanoparticles, changing Mg(NO 3 ) 2 ?6H 2 O and Al(NO 3 ) 3 ?9H 2 The substance ratio of O is 2:1, and other conditions remain unchanged, and Mg is synthesized 2 -Al-CO 3 - LDH nanoparticles.

[0042] Mg 2 -Al-CO 3 -The TEM image of LDH nanoparticles and the particle size distribution of nanoparticles are shown in Figure 4 , Figure 5 As shown, the results show that the obtained Mg 2 -Al-CO 3 -LDH nanoparticles still maintain good dispersion and regular morphology.

Embodiment 3

[0044] Synthesize Mg according to the method identical with embodiment 1 4 -Al-CO 3 -LDH nanoparticles, changing Mg(NO 3 ) 2 ?6H 2 O and Al(NO 3 ) 3 ?9H 2 The substance ratio of O is 4:1, and other conditions remain unchanged, and Mg is synthesized 4 -Al-CO 3 - LDH nanoparticles.

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Abstract

The invention discloses a method for synthesizing hydrotalcite like compound nano particles by a room temperature solid phase method. The method comprises the following steps of: adding a mixture of solid M<2+> and M<3+> metal salt, alkali and carbonate which is ground until the mixture has certain fineness in advance in to a mortar according to certain proportion at room temperature, grinding at uniform speed until the mixture is dried, and performing centrifugal washing by using distilled water for 3 to 4 times to obtain nano M(II) / M(III)-LDH precursors; dispersing the obtained precursors in secondary distilled water, and peptizing at the temperature of between 60 and 100 DEG C to obtain M(II) / M(III)-LDH size; and performing vacuum drying on the M(II) / M(III)-LDH size to obtain M(II) / M(III)-LDH nano particles. Solid-phase reaction is performed at room temperature, crystallization is performed under normal pressure, the method is easy to operate, and various hydrotalcite like compound nano particles with high dispersibility can be synthesized.

Description

technical field [0001] The invention relates to a method for synthesizing hydrotalcite-like compounds, in particular to a method for synthesizing hydrotalcite-like nanoparticles by a solid-phase method at room temperature. Background technique [0002] Layered double metal hydroxides LDHs (Layered Double Hydroxides), also known as hydrotalcite-like compounds (HTlcs) or mixed metal hydroxides (Mixed Metal Hydroxides, MMHs), are a kind of interlayer with exchangeable anions Layered compound, its composition can be expressed as: [M 2+ 1-x m 3+ x (OH) 2 ] x+ A n- x / n mH 2 O. where M 2+ and M 3+ are divalent and trivalent metal cations, respectively, located in the octahedral voids on the host laminate, and x is M 3+ The fraction of the substance mass, ie x = M 3+ / (M 2+ + M 3+ ); A n- is an interlayer anion, m is the number of interlayer crystallization water. A typical LDH compound is Mg-Al-LDH-CO 3 . The hydrotalcite-like layer has a residual positive charg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B13/14B82Y40/00
Inventor 李淑萍张晓晴
Owner NANJING NORMAL UNIVERSITY
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