羟基磷灰石的制备及其对水中氟离子的吸附  

Fabrication of hydroxyapatite and its absorption property for fluorid ion

作　　者：胡家朋[1,2,3] 吴代赦[1] 肖丽盈[3] 刘瑞来[2,3] 饶瑞晔[2,3] 赖文亮 

机构地区：[1]南昌大学资源环境与化工学院,南昌330031 [2]绿色化工技术福建省高等学校重点实验室,武夷山354300 [3]武夷学院生态与资源工程学院,武夷山354300 [4]大仁科技大学环境与职业安全卫生系暨环境管理研究所

出　　处：《环境工程学报》2015年第4期1823-1830,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(40601004);福建省教育厅资助项目(JA11262);南平市科技局项目(N2012Z06);武夷学院青年专项科研基金研究项目(XQ201020);福建省科技厅区域重大项目(2012Y3008)

摘　　要：本研究利用红外光谱(FTIR)、扫描电镜(SEM)和X射线粉末衍射(XRD)观察了共沉淀法合成羟基磷灰石(HAP)的形貌及其晶型结构,并探讨了Ca/P摩尔比、反应时间及反应温度等因素对羟基磷灰石吸附水中氟离子性能的影响。结果表明,n(Ca/P)=1.5/1、反应时间1 h、反应温度40℃、陈化时间48 h、煅烧温度200℃、煅烧时间2 h时,HAP除氟效果最佳,吸附效率和吸附容量分别达到68.8%和6.88 mg/g。实验数据Langmuir等温模式拟合效果优于Freundlich模式,热力学参数计算可知,HAP对氟离子的吸附是自发(ΔG0<0),吸热(ΔH0>0),熵增(ΔS0>0)的过程。HAP对氟离子的吸附符合拟二级反应动力学过程。The morphology and crystal structure of hydroxyapatite( HAP) produced from co-precipitation were observed by three instruments including fourier transform infrared spectroscopy( FTIR),scanning electron microscope( SEM) and X-ray powder diffraction( XRD). The effects of parameters,such as molar ratio Ca / P,time and temperature et al. on fluoride absorption by HAP were investigated. Current results show that the optimal conditions were happened in n( Ca / P) = 1. 5 /1,one hour of reaction time,40℃ of reaction temperature,48 hours of aging time,200℃ of calcination temperature and 2 hours of calcination time,producing fluoride adsorption efficiency and capacity respective to 68. 8% and 6. 88 mg / g. The fitness of adsorption data by Langmuir model was superior to Freundlich model. According to thermodynamic parameters,adsorption of fluoride was a spontaneous reaction( ΔG0< 0),endothermic( ΔH0> 0) and entropy increasing( ΔS0> 0) process. The kinetic simulation of fluoride absorption by HAP was conformed to pseudo second-order kinetics.

关 键 词：羟基磷灰石 除氟 吸附 热力学 动力学 

分 类 号：X703[环境科学与工程—环境工程]