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Layered double hydroxide LDH-I2-(NO3)2 whisker as well as preparation method and application thereof

A technology of LDH-I2- and layered bimetal, which is applied in the field of materials, can solve the problems of high cost, unsuitable for large-scale application, and lengthy preparation technology route, and achieve the effects of low cost, energy saving, and easy operation of the process

Inactive Publication Date: 2018-08-17
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, most of the whiskers prepared from LDH use some kind of whisker (such as magnesium hydroxide whisker) as the precursor, or the preparation technology route is lengthy and the cost is high, which is not suitable for large-scale application.

Method used

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  • Layered double hydroxide LDH-I2-(NO3)2 whisker as well as preparation method and application thereof
  • Layered double hydroxide LDH-I2-(NO3)2 whisker as well as preparation method and application thereof
  • Layered double hydroxide LDH-I2-(NO3)2 whisker as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a layered double metal hydroxide LDH-I 2 -(NO 3 ) 2 Whiskers, whose chemical formula is Mg 6 al 2 (OH) 14 I 2 (NO 3 ) 2 ·6H 2 O, the preparation steps are as follows (as figure 1 shown):

[0038] (ⅰ) Prepare 4.80mol·L -1 MgI 2 ·8H 2 O and 1.60mol L -1 Al(NO 3 ) 3 9H 2 O solution, take these two solutions and mix them in equal volumes in a beaker under stirring, and adjust the pH value of the mixed system to pH=7.50 with 0.1mol / L NaOH solution. At this time, due to Al 3+ The solution becomes turbid due to the hydrolysis of ions, but this phenomenon will not affect the subsequent LDH-I 2 -(NO 3 ) 2 Whisker growth.

[0039] (ii) Prepare a 0.010mol / L NaOH solution, add it to the mixed solution obtained in the previous two steps while stirring, and add it until the pH of the system reaches pH=8.05, then place the system in sufficient sunlight (temperature is 5-45°C) , where the wind speed is 4-5m / s), let the wind and sun for 106...

Embodiment 2

[0042] This embodiment provides a layered double metal hydroxide LDH-I 2 -(NO 3 ) 2 Whiskers, whose chemical formula is Mg 6 al 2 (OH) 14 I 2 (NO 3 ) 2 ·6H 2 O, the preparation process is the same as in Example 1, the difference is that MgI in step (i) 2 ·8H 2 O and Al(NO 3 ) 3 9H 2 After O is mixed, the MgI in the mixture 2 ·8H 2 The concentration of O is 2.20mol L -1 and Al(NO 3 ) 3 9H 2 O concentration is 0.82mol L -1 .

[0043] The layered double metal hydroxide LDH-I that this embodiment prepares 2 -(NO 3 ) 2 The length-to-diameter ratio of the whiskers is 15-25:1, the dispersibility is good, the whisker crystal shape is good, and it has good toughening and reinforcing functions.

Embodiment 3

[0045] This embodiment provides a layered double metal hydroxide LDH-I 2 -(NO 3 ) 2 Whiskers, whose chemical formula is Mg 6 al 2 (OH) 14 I 2 (NO 3 ) 2 ·6H 2 O, the preparation process is the same as in Example 1, MgI in step (i) 2 ·8H 2 O and Al(NO 3 ) 3 9H 2 After O is mixed, the MgI in the mixture 2 ·8H 2 The concentration of O is 2.60mol L -1 and Al(NO 3 ) 3 9H 2 The concentration of O is 0.85mol L -1 , after adding NaOH solution, the pH of the mixture was 7.51.

[0046] The layered double metal hydroxide LDH-I that this embodiment prepares 2 -(NO 3 ) 2 The length-to-diameter ratio of the whiskers is 15-25:1, the dispersibility is good, the whisker crystal shape is good, and it has good toughening and reinforcing functions.

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Abstract

The invention discloses a layered double hydroxide LDH-I2-(NO3)2 whisker as well as a preparation method and application thereof. A chemical formula of the layered double hydroxide LDH-I2-(NO3)2 whisker is Mg6Al2(OH)14I2(NO3)2.6H2O. The whisker is obtained by the following steps of performing reaction on metal cations such as Mg<2+> and Al<3+> and anions such as I<->, NO3<2-> and OH<-> to obtain precipitates, and washing and drying the precipitates. The layered double hydroxide LDH-I2-(NO3)2 whisker provided by the invention is a whisker-shaped hydrotalcite-like compound, has the function of strengthening and toughening of the whisker, also has the functions of the hydrotalcite-like compound of adjustment in pore size, larger specific surface area, interlayer ion interchangeability and thelike, has a very wide application prospect in the fields of toughened and strengthened materials, catalytic materials, flame retardant materials, adsorption materials and the like. The preparation method provided by the invention is simple in technology, liable to operate, low in cost and suitable for large-scale popularization and application.

Description

technical field [0001] The invention belongs to the field of materials, more specifically, relates to a layered double metal hydroxide LDH-I 2 -(NO 3 ) 2 Whiskers and methods for their preparation and use. Background technique [0002] Layered double hydroxide (Layered Double Hydroxide, LDH) is a general designation of hydrotalcite (Hydrotalcite, HT) and hydrotalcite-like compounds (Hydrotalcite-Like Compounds, HTLc), is an important class of inorganic functional materials, with catalytic, Adsorption, flame retardant and other functions, is an environmentally friendly multifunctional inorganic material. [0003] The most typical LDH is Mg 6 al 2 (OH) 16 CO 3 4H 2 O, also known as magnesium aluminum hydrotalcite, if the Mg in this magnesium aluminum hydrotalcite 2+ 、A1 3+ or CO 3 2- Ions are replaced by other ions to obtain hydrotalcite-like (HTLc). The general formula of HTLc is: (where M 2+ For divalent metal ions, such as Mg 2+ 、Ni 2+ 、Co 2+ , Zn 2+ 、Cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/10C30B29/62C30B7/14B01J20/08B01J20/28B01J20/30B01J27/25C09K21/02
CPCC30B29/10B01J20/041B01J20/08B01J20/28014B01J27/25C09K21/02C30B7/14C30B29/62
Inventor 吴健松
Owner LINGNAN NORMAL UNIV
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