文章基本信息

标题：Chemical Characteristics of Hydroxyapatite from Oyster Shell by Thermo-Chemical Process
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作者：Md. Hasan Mahmud ; Kazi Abdus Salam ; M. A. Gafur 等
期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2015
卷号：4
期号：7
页码：5039
DOI：10.15680/IJIRSET.2015.0407002
出版社：S&S Publications
摘要：Oyster shell is basically made of calcium carbonate. An attempt is made to convert calcium carbonate ofoyster shell to hydroxyapatite (HA), a substitute material for bone and teeth in orthopedic and dentistry field due totheir chemical and biological similarity to human hard tissue. In the present work, hydroxyapatite (HA) wassuccessfully synthesized by wet precipitation method using Ca (NO3)2, and (NH4)2HPO4, and NH4OH as startingmaterials. The oyster shell was found to decompose within 10000C to all the carbonate phases. The calcined oystershells were then treated with acids followed by different chemicals in ammoniacal media maintaining properstoichiometry to produce fine hydroxyapatite (HA) as filter cake with a Ca/P molar ratio of 1.67. The dried HA powderwas extremely pure. Different characterization techniques were adopted both for calcined oyster shell and HA byscanning electron microscopy (SEM), X-ray diffractometer (XRD), fourier transform infrared spectroscopy (FTIR) andthermo gravimetric analyzer (TGA). The absorption bands corresponding to phosphate and hydroxyl functional groupwhich are characteristics of hydroxyapatite were confirmed by FTIR. Besides its effectiveness in bone substitution, theprepared HA holds great potential in the field of dental application.
关键词：Oyster shell; Hydroxyapatite; Wet precipitation; Sintering; Calcination.