采用液相共沉淀方法合成了不同镉摩尔含量XCd(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XCd的增加, Cd2+进入到羟基磷灰石的晶格中依次形成Ca3.9(Ca4.7Cd0.7)(PO4)6(OH)1.8, Ca3.8(Ca4.1Cd0.73)(PO4_6(OH)1.8, Ca3.6(Ca4.5Cd0.76)(PO4)6(OH)1.6和Cd5(PO4)3OH;
这些产物在500℃以下均可稳定存在, 且热稳定性随着XCd的增加明显提高; 毒性浸出结果显示, Cd2+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 Cd2+ enters into the hydroxyapatites crystal lattice. And
with molar ratios of Cd/(Cd+Ca) increasing, there forms the phases of Ca3.9(Ca4.7Cd0.7)(PO4)6(OH)1.8, Ca{3.8(Ca4.1Cd0.73)(PO4)6(OH)1.8, Ca3.6(Ca4.5Cd0.76)(PO4)6(OH)1.6, Cd5(PO4)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.
参考文献
| [1] | Xiu Z L, Lu M K, Gu F, et al. Inorg. Chem. Commun., 2004, 7 (5): 604-606. [2] Yasukawa A, Kamiuchi K, Yokoyama T, et al. J. Solid State Chem., 2002, 163 (1): 27-32. [3] Yasukawa A, Higashijima M, Kandori K, et al. Colloids Surf. A, 2005, 268 (1): 111-117. [4] Zhu K J, Yanagisawa K, Onda A, et al. J. Solid State Chem., 2004, 177 (12): 4379-4385. [5] Miyaji F, Kono Y, Suyama Y. Mater. Res. Bull., 2005, 40 (2): 209-220. [6] Mayer I, Featherstone J D B. J. Cryst. Growth, 2000, 219 (1): 98-101. [7] Stack A G, Erni R, Browning N D, et al. Environ. Sci. Technol., 2004, 38 (21): 5529-5534. [8] Chen G C, He Z L, Stoffella P J, et al. J. Trace Elem. Med. Biol., 2006, 20 (2): 127-133. [9] Crannell B S, Eighmy T T, et al. Waste Manage., 2000, 20 (2-3): 135-148. [10] Eighmy T T, Crannell B S, G.Butler L. Environ. Sci. Technol., 1997, 31 (11): 3330-3338. [11] Bournonville B, Nzihou A, Sharrock P, et al. J. Hazard. Mater., 2004, 116 (1-2): 65-74. [12] U.S EPA, 1992. Toxicity characteristic leaching procedure (method 1311) in SW-846. Office of Solid Waste, Washington, DC. [13] Inorganic Crystal Structure Database (ICSD), Fachinformationszentrum Karlsruhe, Germany, 2005. [14] Liou S C, Chen S Y, Lee H Y, et al. Biomaterials, 2004, 25 (2): 189-196. [15] Regi M V, Lorenzo L M R, Salinas A J. Solid State Ionics, 1997, 101-103 (11): 1279-1285. [16] Meejoo S, Maneeprakorn W, Winotai P. Thermochim. Acta, 2006, 447 (1): 115-120 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%