羟基磷灰石对氟离子的吸收作用  

Absorption Ability of Hydroxyapatite on Fluoride Ions

作　　者：岳雪涛[1] 孙康宁[2] 冯立明[1] 

机构地区：[1]山东建筑大学材料科学与工程学院,济南250101 [2]山东大学材料液态结构及其遗传性教育部重点实验室,济南250061

出　　处：《人工晶体学报》2015年第4期1143-1148,共6页Journal of Synthetic Crystals

基　　金：山东建筑大学博士科研基金(XNBS1435)

摘　　要：用基准Na F配置标准溶液,用氟离子选择性电极测定氟离子的标准曲线,将自制的羟基磷灰石(HAP)粉体放入三组不同配方的Na F溶液浸泡,测定HAP在吸收氟离子的过程中溶液的p H值和氟离子浓度的变化,并利用XRD、TEM、EDS等对吸附氟离子的HAP粉体进行检测。结果表明,HAP对氟离子的吸附动力学相对于Lagergren拟一级速率方程,更符合Lagergren拟二级速率方程,线性相关系数R2为1。降低p H值可以提高氟离子吸收率,HAP在吸收氟离子的同时释放出大量的氢氧根,提高了溶液的p H值。吸收氟离子后粉末晶体的XRD图谱的测试结果与FAP的图谱相一致,微观结构相近均为棒状结构,EDS结果表明粉体晶体结构中掺杂了大量的氟离子,得到的粉末晶体为FAP。A standard curve of F-was obtained by fluoride-ion selective electrode in the Na F standard solution. The homemade hydroxyapatite（ HAP） powders were dispersed into three Na F solutions. The p H value and F-concentration of the three solutions were measured to reflect the adsorption of fluoride ions on HAP. The HAP powders were characterized by the XRD,TEM,EDS and so on. The results indicate that the adsorption kinetics of F-onto HAP powders conform more exactly to the Pseudo-secondorder equation than the Pseudo-first-order equation with the correlation coefficient R2 of 1. With the adsorption of F-onto HAP crystals,hydroxyl ions are released into the solution which raises p H value.Low p H value can facilitate the adsorption of F-. The XRD pattern of the powders absorbed with Fconsisted with that of the fluorapatite（ FAP）,and the TEM images show that the morphology of crystals are rod-like or granules structure same to HAP. Besides,the EDS spectra also showed that the powders contained a larger amount of F-in crystals,which is determined to be the FAP.

关 键 词：氟离子选择性电极 HAP FAP 吸附 

分 类 号：TQ174[化学工程—陶瓷工业]