Adulterated hydroxyapatite and its production method

A technology of hydroxyapatite and its production method, which is applied in the fields of chemistry and materials, can solve problems such as inability to achieve saturated doping, and achieve the effects of increasing fluorine absorption capacity, easy promotion, and good use effect

Inactive Publication Date: 2003-05-07
WUHAN CHEM COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It also provides a production method for doping hydroxyapatite, so as to solve the technical difficulty that saturated doping cannot be achieved in the previous synthesis process of hydroxyapatite

Method used

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with embodiment.

[0014] The doped hydroxyapatite provided by the present invention has a chemical structural molecular formula of:

[0015] Ca 10 {(PO 4 ) 6-y (CO 3 ·OH) y}{(OH) 2-2x (CO 3 ) x}, wherein, X=0~0.5, Y=0~3.0.

[0016] The production method of doped hydroxyapatite provided by the invention comprises the following steps:

[0017] a. Adding Ca(NO 3 ) 2 , (NH 4 ) 2 HPO 4 , NH 4 HCO 3 Raw materials, according to the original Ca / P molar ratio of 2.15 to 2.35 and the original CO 3 2- The blending amount is 10-15% for batching and sol formation respectively;

[0018] b. Will (NH 4 ) 2 HPO 4 , NH 4 HCO 3 The sol-sol is mixed to form a mixed amine sol;

[0019] c. Adding Ca(NO 3 ) 2 The sol is slowly dropped into the mixed amine sol;

[0020] d. While stirring, adjust the pH value to 9-12 with ammonia water to form a doped hydroxyapatite gel;

[0021] e. Stand still and...

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Abstract

A doped hydroxy phosphorite used to remove F and Pb from drinking water has a chemical formula: Ca10{(PO4)6-y(CO3.OH)y}{(OH)2-2x(CO3)x}, and is prepared through proportioning Ca(NO3)2, (NH4)2HPO4 and NH4HCO3, mixing with (NH4)2HPO4 and NH4HCO3, slow dropping Ca(NO3)2, regulating pH value by ammonia water, stirring to generate gel of doped hydroxy phosphorite, ageing, washing, pressure filtering, shaping and drying. Advantages include: good effect, nontoxic, no secondary pollution, large fluorine adsorbance etc.

Description

technical field [0001] The invention relates to the fields of chemistry and materials, in particular to a doped hydroxyapatite and a production method thereof. Doped hydroxyapatite is a filter material used to remove soluble fluorine, lead and other harmful substances in drinking water. Its chemical formula is Ca 10 {(PO 4 ) 6-y (CO 3 ·OH) y}{(OH) 2-2x (CO 3 ) x}. Background technique [0002] At present, the filter materials used to remove harmful substances such as soluble fluorine and lead in drinking water mainly include chelating resin, lanthanum-loaded fiber, activated alumina, natural clay minerals and their modified products, and mixtures of kaolinite and dolomite. , bone carbon (bioapatite), hydroxyapatite and other seven kinds. Please see the attached table: Among them, hydroxyapatite and bone carbon have the best use effect, but their fluorine absorption capacity is small; while chelate resin and lanthanum-loaded fiber have the largest fluorine absorption...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D39/00B01J20/02C01B25/32C02F1/58
Inventor 黄志良刘羽
Owner WUHAN CHEM COLLEGE
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