Hydrotalcite-like compound/eggshell membrane composite film and preparation method thereof

A technology of composite film and eggshell membrane, applied in chemical instruments and methods, other chemical processes, alkali metal compounds, etc., to achieve cost saving, good removal of hexavalent chromium, and environmental requirements

Inactive Publication Date: 2010-07-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of hydrotalcite-like and biomaterial composites by in situ synthesis using biological materials directly as the matrix. This work is of great significance for further expanding the application of hydrotalcite-like in the biological field.

Method used

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  • Hydrotalcite-like compound/eggshell membrane composite film and preparation method thereof
  • Hydrotalcite-like compound/eggshell membrane composite film and preparation method thereof
  • Hydrotalcite-like compound/eggshell membrane composite film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A. Soak fresh eggshells in HCl solution with a concentration of 2M. After the calcium carbonate in the eggshells is dissolved, separate the eggshell membranes and wash them for later use;

[0038] B. Weigh 1.71gMg(NO 3 ) 2 ·6H 2 O, 1.25gAl(NO 3 ) 3 9H 2 O and 5.6g urea, dissolved in deionized water to configure a metal ion concentration of 0.1mol / L, Mg 2+ with Al 3+ The molar ratio is 2, urea and NO 3 - A 100mL mixed solution with a molar ratio of 4;

[0039] C. Put the eggshell membrane prepared in step A into the solution in step B, react at 90°C for 72 hours, take out the membrane, rinse it with deionized water, and dry it at room temperature to obtain CO 3 2- A composite film of hydrotalcite-like / eggshell membrane, wherein the chemical formula of the hydrotalcite-like part is Mg 0.67 Al 0.33 (OH) 2 (CO 3 ) 0.165 0.7H 2 O.

[0040] figure 1 is the CO obtained in step C 3 2- XRD diffraction patterns of hydrotalcite-like / eggshell membrane composite ...

Embodiment 2

[0043] A. Soak fresh eggshells in HCl solution with a concentration of 1M. After the calcium carbonate in the eggshells is dissolved, separate the eggshell membranes and wash them for later use;

[0044] B. Weigh 2.56gMg(NO 3 ) 2 ·6H 2 O, 1.87gAl(NO 3 ) 3 9H 2 O and 6.9g urea, dissolved in deionized water to configure a metal ion concentration of 0.15mol / L, Mg 2+ with Al 3+ The molar ratio is 2, urea and NO 3 - A 100mL mixed solution with a molar ratio of 4;

[0045] C. Place the eggshell membrane prepared in step A into the solution in step B, react at 80°C for 48 hours, take out the membrane, rinse it with deionized water, and dry it at room temperature to obtain CO 3 2- A composite film of hydrotalcite-like / eggshell membrane, wherein the chemical formula of the hydrotalcite-like part is Mg 0.65 Al 0.35 (OH) 2 (CO 3 ) 0.175 0.63H 2 O.

Embodiment 3

[0047] A. Soak fresh eggshells in HCl solution with a concentration of 3M. After the calcium carbonate in the eggshells is dissolved, separate the eggshell membranes and wash them for later use;

[0048] B. Weigh 7.12gMgCl respectively 2 , 3.33gAlCl 3 and 54.05g urea, configured so that the metal ion concentration is 1mol / L, Mg 2+ with Al 3+ The molar ratio is 3, urea and Cl - A 100mL mixed solution with a molar ratio of 4;

[0049] C. Put the eggshell membrane prepared in step A into the solution in step B, react at 90°C for 24 hours, take out the film, rinse it with deionized water, and dry it at room temperature to obtain CO 3 2- A composite film of hydrotalcite-like / eggshell membrane, wherein the chemical formula of the hydrotalcite-like part is Mg 0.75 Al 0.25 (OH) 2 (CO 3 ) 0.125 0.75H 2 O.

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Abstract

The invention discloses a hydrotalcite-like compound/eggshell membrane composite film and a preparation method thereof and belongs to the technical field of preparation of composite-function film materials, and the composite film is researched as a chromyl adsorbent. The invention has the technical scheme that the eggshell membrane is used as a substrate and a template, and the hydrotalcite-like compound is fixed to the surface of the eggshell membrane by using an in-situ growth method, thereby obtaining an inorganic-biological composite film with a reticular structure. The invention uses the biological substrate eggshell membrane as the substrate and template for the first time, adopts an in-situ crystallization method to prepare the hydrotalcite-like compound/eggshell membrane inorganic-biological composite film, and makes a preliminary research into the applications of hydrotalcite-like materials in the field of biology. The composite film has favorable adsorbability as a chromyl adsorbent, and especially can carry out adsorption under the acidic conditions of a lower pH value, thereby saving the cost and meeting the requirements of the environment.

Description

technical field [0001] The invention belongs to the technical field of preparation of composite functional film materials, in particular to a hydrotalcite-like / eggshell membrane composite film and a preparation method thereof, and the composite film is studied as an adsorbent for hexavalent chromium. Background technique [0002] Hydrotalcite-like (abbreviated as LDH) is a layered inorganic multifunctional material, because of its adjustable properties such as adjustable layer element composition, interlayer guest, adjustable crystal size, etc., it has been used in additives, catalytic , biomedicine and many other fields have shown broad application prospects. It is worth pointing out that because of the intercalation properties of hydrotalcite-like materials, it has inherent advantages in adsorption, molecular container and drug sustained release. In recent years, the research on the functionalization of hydrotalcite has gradually turned to thin film and immobilization, so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/28B01J20/30
Inventor 郭孝孝张法智徐赛龙雷晓东段雪
Owner BEIJING UNIV OF CHEM TECH
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