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Method for preparing different crystal system calcium carbonate by using chitosan

A technology of chitosan and calcium carbonate, applied in the field of bionic materials, can solve problems that have not been studied

Inactive Publication Date: 2008-08-27
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the choice of the morphology of chitosan molecular chains to the crystal form of calcium carbonate has not been studied.

Method used

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  • Method for preparing different crystal system calcium carbonate by using chitosan
  • Method for preparing different crystal system calcium carbonate by using chitosan

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] At first chitosan (degree of acetylation is less than 10%) is dissolved in the acetic acid aqueous solution that contains 1%, and concentration is 0.2g / ml, then adds calcium chloride dihydrate and urea to make the mol ratio of the two be 1: 5, And stir evenly, adjust the pH to be less than 6.0. The reactants were then transferred to a Teflon-lined autoclave and reacted at 100°C for 3 hours. After the reaction, the reactor was taken out and cooled to room temperature naturally. After filtration, the product was washed with distilled water and ethanol, respectively, and dried at room temperature.

[0023] X-ray diffraction (XRD) analysis was carried out to the prepared product, and the obtained product was calcite-type calcium carbonate.

Embodiment 2

[0025] At first chitosan (degree of acetylation is less than 10%) is dissolved in the acetic acid aqueous solution that contains 1%, and concentration is 0.4g / ml, then adds calcium chloride dihydrate and urea to make the mol ratio of the two be 1: 5, And stir evenly, adjust the pH to be less than 6.0. The reactants were then transferred to a Teflon-lined autoclave and reacted at 100°C for 3 hours. After the reaction, the reactor was taken out and cooled to room temperature naturally. After filtration, the product was washed with distilled water and ethanol, respectively, and dried at room temperature.

[0026] X-ray diffraction (XRD) analysis was carried out to the prepared product, and the obtained product was calcite-type calcium carbonate.

Embodiment 3

[0028] At first chitosan (degree of acetylation is less than 10%) is dissolved in the acetic acid aqueous solution that contains 1%, and concentration is 0.6g / ml, then adds calcium chloride dihydrate and urea to make the mol ratio of the two be 1: 5, And stir evenly, adjust the pH to be less than 6.0. The reactants were then transferred to a Teflon-lined autoclave and reacted at 100°C for 3 hours. After the reaction, the reactor was taken out and cooled to room temperature naturally. After filtration, the product was washed with distilled water and ethanol, respectively, and dried at room temperature.

[0029] X-ray diffraction (XRD) analysis was carried out to the prepared product, and the obtained product was calcite-type calcium carbonate.

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Abstract

The invention relates to a process for preparing calcium carbonate with different crystal forms by employing chitosan, which belongs to the biomimetic materials field. The steps of the invention comprise adding chitosan in water solution with calcium chloride and urea according to a certain proportion and controlling modality of chitosan molecular chain to hydro-thermally synthesize calcium carbonate with different crystal form via changing pH of reaction solution. The invention realizes the method of synthesizing calcium carbonate with different crystal forms by manual work, and is expected to be applied to the biomineralization process and synthesis of biomineralization materials.

Description

technical field [0001] The invention relates to a method for preparing calcium carbonate of different crystal forms by using chitosan, which belongs to the field of bionic materials. Background technique [0002] Among many natural biomineralized materials (such as shells, eggshells, sea urchin fibers, snake shells, human teeth and bones, etc.), calcium carbonate composites are one of the most important and most valuable materials for research. As the most common biomineralized material, calcium carbonate is ubiquitous in nature. Through the process of biomineralization, calcium carbonate often exists in the form of natural organic-inorganic composites with orderly arrangement and excellent structure, and has various crystal forms such as calcite, aragonite, and vaterite. As an additive, calcium carbonate is widely used in rubber, plastic, ink, paper, food, medicine and other industries and departments, and is a very important inorganic material. Therefore, the synthesis o...

Claims

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Application Information

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IPC IPC(8): C01F11/18
Inventor 祝迎春肖军武刘艳艳
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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