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Synthetic method of amorphous calcium carbonate

An amorphous calcium carbonate and synthesis method technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of poor controllability, and achieve the effect of cheap raw materials, easy access to raw materials, and simple operation

Inactive Publication Date: 2019-11-22
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the synthetic method of amorphous calcium carbonate is more, as direct mixing method (Koga N, Nakagoe Y, TanakaH.Crystallization of amorphous calcium carbonate.Thermochimica Acta, 1998,318 (1): 239-244.), CO 2 Gas diffusion method (Günther C, Becker A, Wolf G, Epple M.In vitrosynthesis and structural characterization of amorphous calciumcarbonate.Zeitschrift für organische und allgemeine Chemie, 2005,631(13):2830-2835.), hydrolysis of carbonic acid source method ( Faatz M, F, Wegner G. Amorphous calcium carbonate: synthesis and potential intermediate in biomineralization. Advanced Materials, 2004, 16 (12): 996-1000.), Kitano method (Lee H S, Ha T H, Kim K. Fabrication of unusually stable amorphous calcium carbonate in an ethanol medium.MaterialsChemistry and Physics, 2005,93(2):376-382.), but most of these synthetic methods have poor controllability

Method used

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  • Synthetic method of amorphous calcium carbonate

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 0.111 g CaCl 2 Dissolve in 100 ml of deionized water to form solution A, and dissolve 0.018 g of cetyltrimethylammonium bromide in solution A; dissolve 0.424 g of NaCO 3 Dissolve in 100 ml of deionized water to form solution B, and adjust the pH to 11 by adding 0.1 mol / L sodium hydroxide solution; put the two solutions of A and B in the refrigerator at 4°C for 40 minutes, and quickly remove the solution after taking it out B was added to solution A, stirred for 1 minute, and then centrifuged at a speed of 3000 rpm. The separated solid was washed twice with absolute ethanol, and finally dried in cold air at room temperature to obtain the product. X-ray diffraction The obtained product was characterized by XRD, which contained amorphous calcium carbonate and partially crystalline calcium carbonate.

Embodiment 2

[0032] 5.549 g CaCl 2 Dissolve in 100 ml of deionized water to form solution A, and dissolve 0.182 g of cetyltrimethylammonium bromide in solution A; dissolve 1.325 g of NaCO 3 Dissolve in 100 ml of deionized water to form solution B, and adjust the pH to 13 by adding 0.1 mol / L sodium hydroxide solution; put the two solutions of A and B in the refrigerator at 4°C for 60 minutes, and quickly remove the solution after taking it out B was added to solution A, stirred for 1 minute, and then centrifuged at a speed of 5000 rpm. The separated solid was washed twice with absolute ethanol, and finally dried in cold air at room temperature. The XRD pattern of the product was similar to that of Example 1.

Embodiment 3

[0034] 1.110 g CaCl 2 Dissolve in 100 ml of deionized water to form solution A, and dissolve 0.109 g of cetyltrimethylammonium bromide in solution A; dissolve 1.060 g of NaCO 3 Dissolve in 100 ml of deionized water to form solution B, and adjust the pH to 12 by adding 0.1 mol / L sodium hydroxide solution; put the two solutions of A and B in the refrigerator at 4°C for 50 minutes, and quickly remove the solution after taking it out B was added to solution A, stirred for 1 minute, and then centrifuged at a speed of 4000 rpm. The separated solid was washed twice with absolute ethanol, and finally dried in cold air at room temperature. The XRD pattern of the product was similar to that of Example 1.

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Abstract

The invention discloses a synthesis method of amorphous calcium carbonate, which comprises the following steps: (1) preparing a solution A: dissolving a water-soluble calcium salt in deionized water,and adding an ionic surfactant to form the solution A, with the molar ratio of the water-soluble calcium salt to the ionic surfactant being 1:1-100:1; (2) preparing a solution B: dissolving water-soluble carbonate or bicarbonate in deionized water, and adjusting the pH value of the solution to 11-13 to form the solution B; (3) refrigerating the solution A in the step (1) and the solution B in thestep (2) at -5 DEG C to 5 DEG C for 40 to 60 minutes, then quickly mixing the refrigerated solution A and the solution B, stirring the mixture for 5-60 seconds, and carrying out centrifugal separation, washing and drying to obtain the amorphous calcium carbonate. The synthesis method provided by the invention has the advantages of simple operation, cheap and easily available raw materials, high reaction rate, no need of complex expensive instruments or devices, and the like.

Description

[0001] (1) Technical field [0002] The invention relates to the technical fields of chemical engineering and material engineering, in particular to a method for synthesizing amorphous calcium carbonate. [0003] (2) Background technology [0004] In nature, there are six crystalline forms of calcium carbonate, including three anhydrous forms: calcite, aragonite and vaterite; three crystalline forms: amorphous calcium carbonate (amorphous calcium carbonate) ), calcium carbonate monohydrate and calcium carbonate hexahydrate. Among the six calcium carbonates, except for the amorphous calcium carbonate ACC, the other five are all crystalline. Under standard conditions, calcite and aragonite have similar thermodynamic stability and are common in both biology and geology. Compared with calcite and aragonite, vaterite is in a metastable state, rarely occurs in nature, and only a small amount is detected in some biomineralization structures, and has not yet appeared in the geologica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/18
CPCC01F11/18C01P2002/72
Inventor 周春晖沈程程陈鹏
Owner ZHEJIANG UNIV OF TECH
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