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Method for synthesizing high-purity hydroxyapatite (HA) from eggshells under hydrothermal condition

A technology of hydrothermal synthesis of hydroxyapatite, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as lack of research, achieve the effects of wide sources, reduce preparation costs, and increase added value

Inactive Publication Date: 2011-05-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been studies abroad on the preparation of HA biomaterials from eggshells, but there is a lack of research in my country.

Method used

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  • Method for synthesizing high-purity hydroxyapatite (HA) from eggshells under hydrothermal condition
  • Method for synthesizing high-purity hydroxyapatite (HA) from eggshells under hydrothermal condition
  • Method for synthesizing high-purity hydroxyapatite (HA) from eggshells under hydrothermal condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Collect part of the egg shells, wash with tap water to remove the soil and adhering impurities on the egg shells, boil hot water for a period of time, and remove the inner film after drying. The dried eggshells are broken into small pieces, placed in a crucible, and calcined in a box-type resistance furnace. The first step is to raise the temperature to 450°C, keep it for 2 hours, then raise the temperature to 900°C, keep it for 4 hours, and cool down to room temperature with the furnace. Grind the calcined white eggshell into powder with a mortar, pass through a 120-mesh sieve, collect 10 g of calcined eggshell powder (composition is CaO), weigh diammonium hydrogen phosphate ((NH 4 ) 2 HPO 3 , Shantou Xilong Chemical Co., Ltd.) 18g of (NH 4 ) 2 HPO 3 Solution, heated to 90°C in a constant temperature water bath and kept warm, under the condition of strong stirring, eggshell powder was gradually added to (NH 4 ) 2 HPO 3 in solution. Stir and react at a constant ...

Embodiment 2

[0022] Collect part of the egg shells, wash with tap water to remove the soil and adhering impurities on the egg shells, boil hot water for a period of time, and remove the inner film after drying. The dried eggshells are broken into fine pieces, placed in a crucible, and calcined in a box-type resistance furnace. The first step is to raise the temperature to 450°C, keep it for 2 hours, then raise the temperature to 900°C, keep it for 4 hours, and cool down to room temperature with the furnace. Grind the calcined white eggshell into powder with a mortar and mortar, pass through a 120-mesh sieve, collect 10 g of calcined eggshell powder (composition is CaO), weigh it as analytically pure diammonium hydrogen phosphate ((NH 4 ) 2 HPO 3 , Shantou Xilong Chemical Co., Ltd.) 18g of (NH 4 ) 2 HPO 3 Solution, heated to 90°C in a constant temperature water bath and kept warm, under the condition of strong stirring, eggshell powder was gradually added to (NH 4 ) 2 HPO 3 in soluti...

Embodiment 3

[0026] Collect part of the egg shells, wash with tap water to remove the soil and adhering impurities on the egg shells, boil hot water for a period of time, and remove the inner film after drying. The dried eggshells are broken into small pieces, placed in a crucible, and calcined in a box-type resistance furnace. The first step is to raise the temperature to 450°C, keep it for 2 hours, then raise the temperature to 900°C, keep it for 4 hours, and cool down to room temperature with the furnace. Grind the calcined white eggshell into powder with a mortar and mortar, pass through a 120-mesh sieve, collect 10 g of calcined eggshell powder (composition is CaO), weigh it as analytically pure diammonium hydrogen phosphate ((NH 4 ) 2 HPO 3 , Shantou Xilong Chemical Co., Ltd.) 18g of (NH 4 ) 2 HPO 3 Solution, heated to 90°C in a constant temperature water bath and kept warm, under the condition of strong stirring, eggshell powder was gradually added to (NH 4 ) 2 HPO 3 in solut...

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Abstract

The invention relates to a process for preparing high-purity hydroxyapatite (HA) from eggshells under a hydrothermal condition. The structural feature of the synthesized HA powder is similar to that of the natural skeleton HA; and the synthesized HA comprises OH<->, H2O, CO3<2-> and other groups. A single HA particle is in nano size, and the HA particles aggregate into micron large granules. The existing preparation methods for HA comprise a chemical precipitation method, a hydrothermal synthesis method, a sol-gel method, a micro-emulsion method and the like; the raw materials for preparation mainly comprise chemical materials, animal skeletons, coral and the like, and have the defects of high price, high preparation cost and the like; and at present, about 400 thousand tons of eggshells are discarded in China every year, thereby causing serious environmental pollution and waste of resources. According to the invention, abundant calcium in the eggshells is utilized, and a proper preparation method is used for synthesizing the HA, thereby lowering the production cost of the HA and effectively increasing the added value of an eggshell utilization technique.

Description

Technical field [0001] The invention relates to a method for synthesizing hydroxyapatite, in particular to a method for synthesizing hydroxyapatite by using eggshell low-temperature hydrothermal, and belongs to the field of inorganic synthesis. Background technique [0002] Hydroxyapatite (HA for short, chemical formula Ca 5 (PO 4 ) 3 (OH)) has good bioactivity and compatibility and excellent bonding performance with human bone. As a new type of biomedical material, it has been widely used in the fields of bone filling, artificial tooth root and artificial bone. In addition, it can also be used in Drug carrier, oral health care and water treatment. At present, the preparation methods of hydroxyapatite include chemical precipitation method, hydrothermal synthesis method, sol-gel method and microemulsion method. The raw materials prepared mainly include chemical raw materials, animal bones and corals. These raw materials are not only expensive, but also have many disadvant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32
Inventor 董衍林王庆良
Owner CHINA UNIV OF MINING & TECH
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