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Method for controlling mutual transformation between calcite and vaterite by using calcium source concentration

A technology of calcite and vaterite, applied in the field of biomimetic materials, achieves the effects of high repeatability, fast response speed, and low environmental conditions

Active Publication Date: 2019-08-23
大连锡安科技有限公司
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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 method of controlling the interconversion of calcite and vaterite by using the concentration of calcium source

Method used

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  • Method for controlling mutual transformation between calcite and vaterite by using calcium source concentration
  • Method for controlling mutual transformation between calcite and vaterite by using calcium source concentration
  • Method for controlling mutual transformation between calcite and vaterite by using calcium source concentration

Examples

Experimental program
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Embodiment 1

[0041] Step 1: inoculate S.pasteurii on the culture medium, and culture it in a shaking incubator at 30°C and 100r / min for 48 hours to obtain a bacterial liquid; wherein, the culture medium includes yeast extract 10~ 30g / L, ammonium sulfate 15g / L, the pH of the medium is 7-9.5;

[0042] Step 2: configure the mixed solution of urea and calcium acetate monohydrate as a nutrient salt solution, wherein the concentration of urea is 0.5mol / L, and the concentration of calcium acetate monohydrate is 0.025mol / L;

[0043] Step 3: Prepare 0.2g / L urease solution (urease activity is 137u / mg), add the urease solution into the nutrient salt solution, and the volume ratio of the nutrient salt solution to the urease solution is 9:1;

[0044] Step 4: Add the bacterial liquid to the mixed solution of urease and nutrient salt, the volume ratio of the bacterial liquid to the mixed solution is 1:10, shake evenly, and stand at 20°C for 72 hours;

[0045] Step 5: Ultrasonic treatment at 20-40°C for 30...

Embodiment 2

[0051] Step 1: inoculate S.pasteurii on the culture medium, and culture it in a shaking incubator at 30°C and 100r / min for 48 hours to obtain a bacterial liquid; wherein, the culture medium includes yeast extract 10~ 30g / L, ammonium sulfate 15g / L, the pH of the medium is 7-9.5;

[0052] Step 2: configure the mixed solution of urea and calcium acetate monohydrate as a nutrient salt solution, wherein the concentration of urea is 0.5mol / L, and the concentration of calcium acetate monohydrate is 0.1mol / L;

[0053] Step 3: Prepare 0.2g / L urease solution (urease activity is 137u / mg), add urease solution into nutrient salt solution, the volume ratio of nutrient salt solution to urease solution is 8:1;

[0054] Step 4: Add the bacterial liquid to the mixed solution of urease and nutrient salt, the volume ratio of the bacterial liquid to the mixed solution is 1:10, shake evenly, and stand at 20°C for 72 hours;

[0055] Step 5: Ultrasonic treatment at 20-40°C for 30min-1h to obtain a s...

Embodiment 3

[0061] Step 1: inoculate S.pasteurii on the culture medium, and culture it in a shaking incubator at 30°C and 100r / min for 48 hours to obtain a bacterial liquid; wherein, the culture medium includes yeast extract 10~ 30g / L, ammonium sulfate 15g / L, the pH of the medium is 7-9.5;

[0062] Step 2: configure the mixed solution of urea and calcium acetate monohydrate as a nutrient salt solution, wherein the concentration of urea is 0.5mol / L, and the concentration of calcium acetate monohydrate is 0.3mol / L;

[0063] Step 3: Prepare 0.2g / L urease solution (urease activity is 110u / mg), add urease solution into nutrient salt solution, the volume ratio of nutrient salt solution to urease solution is 9:1;

[0064] Step 4: Add the bacterial liquid to the mixed solution of urease and nutrient salt, the volume ratio of the bacterial liquid to the mixed solution is 1:10, shake evenly, and stand at 10°C for 72 hours;

[0065] Step 5: Ultrasonic treatment at 20-40°C for 30min-1h to obtain a s...

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Abstract

The invention discloses a method for controlling the mutual transformation between calcite and vaterite by using a calcium source concentration. The method comprises the following steps: inoculating S. pasteurii on a medium; preparing a nutrition salt solution of urea and calcium acetate monohydrate; preparing a urease solution, and adding the urease solution into the nutrient salt solution; adding the bacteria solution into the urease and nutrient salt mixed solution; performing ultrasonic treatment at 20-40 DEG C for 30 min-1 h to obtain a suspension; pouring the suspension into a centrifugetube, performing centrifugation at 4000 rpm, pouring off the supernatant liquid, and adding deionized water for washing; washing the unreacted calcium acetate monohydrate away; and placing the whiteparticle precipitate after centrifugation in a drying box for drying to obtain calcium carbonate with different compositions and morphology. According to the method, the calcium source concentration is only changed, the continuous transformation of calcium carbonate from the calcite structure to the vaterite structure is realized, calcite and vaterite coexist in a certain range of the calcium source concentration, the requirements on environmental conditions are low, the other used reagents are environment-friendly, and the experimental results are highly repeatable.

Description

technical field [0001] The invention belongs to the technical field of biomimetic materials, and in particular relates to a method for controlling the mutual transformation of calcite and vaterite by utilizing the calcium source concentration. Background technique [0002] In nature, calcium carbonate is one of the most common biomineralized materials and is an important component of animal bones, shells, corals, etc. Calcium carbonate is widely used in industry and is an important inorganic industrial additive. It can improve bulk, gloss, brightness, fluidity, strength and other properties of products in the fields of food, papermaking, coatings, and rubber. [0003] Calcium carbonate has many structures, and it can be divided into anhydrous calcium carbonate and hydrated calcium carbonate according to whether it contains crystal water. Anhydrous calcium carbonate crystals have three crystal forms: calcite, aragonite and vaterite. The physical and mechanical properties of...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/185C01P2002/72C01P2004/03C01P2004/61
Inventor 杨建林张岩李喜林王来贵宋诗雨陈伟胡子游
Owner 大连锡安科技有限公司
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