含镉羟基磷灰石的形成及其稳定性  

Preparation and Stability of Calcium Cadmium Hydroxyapatite

作　　者：钱光人[1] 白红梅[1] 孙福成[1] 周吉峙[1] 孙为民[1] 徐霞[1] 

机构地区：[1]上海大学环境与化学工程学院环境系,上海200072

出　　处：《无机材料学报》2008年第5期1016-1020,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(20477024;20677037)

摘　　要：采用液相共沉淀方法合成了不同镉摩尔含量X_(Cd)(即:Cd/(Ca+Cd))的镉羟基磷灰石.通过XRD,FT-IR,FE-SEM,TG-DTG-DSC-MS和TCLP对产物的组成、形貌、热稳定性及化学稳定性进行了探讨.结果表明,随着X_(Cd)的增加,Cd^(2+)进入到羟基磷灰石的晶格中依次形成Ca_(3.9)(Ca_(4.7)Cd_(0.7))(PO_4)_6(OH)_(1.8),Ca_(3.8)(Ca_(4.1)Cd_(0.73))(PO_4)_6(OH)_(1.8),Ca_(3.6)(Ca_(4.5)Cd_(0.76))(PO_4)6(OH)_(1.6)和Cd^5(PO_4)_3OH;这些产物在500℃以下均可稳定存在,且热稳定性随着X_(Cd)的增加明显提高;毒性浸出结果显示,Cd^(2+)能够进入到羟基磷灰石的晶格中,但产物的化学稳定性不高.Calcium cadmium hydroxyapatites with various Cd doping （Cd/（Cd＋Ca））were synthesized and characterized by X-ray diffraction, FT-IR spectroscope and FESEM. TG-DTG-DSC-MS and Toxicity Characteristic Leaching Procedure （TCLP） were used to determine their thermal and chemical stability. The results show that Cd^2＋ enters into the hydroxyapatites crystal lattice. And with molar ratios of Cd/（Cd＋Ca） increasing, there forms the phases of Ca3.9（Ca4.TCd0.7）（PO4）6（OH）1.8, Ca3.8 （Ca4.1 Cd0.73） （PO4）6 （OH） 1.8, Ca3.6 （Ca4.5 Cd0.76） （PO4）6 （OH） 1.6 , Cd5 （POa）3OH, respectively. All the calcium cadmium hydroxyapatites are thermal stable up to 500℃, and their thermal stabilities are enhanced with the increase of Cd doping, but their chemical stabilities become worse.

关 键 词：镉羟基磷灰石 热稳定性 化学稳定性 

分 类 号：X703[环境科学与工程—环境工程]