摘要
采用湿化学沉淀法合成粉末状羟基磷灰石(HA)和氟掺杂羟基磷灰石(FHA93和FHA200),通过红外光谱、X射线衍射、热失重分析及X射线光电子能谱进行表征,研究了其对模拟废水中UO2+2的吸附去除性能,考察了p H值、UO2+2初始浓度、吸附时间和温度等条件对羟基磷灰石和氟掺杂羟基磷灰石去除UO2+2的影响。结果表明:HA,FHA93和FHA200 3种吸附剂对UO2+2的最大去除率均在99.5%左右;吸附平衡数据符合Langmuir模型,吸附动力学数据与准二阶动力学方程较吻合;FHA200在p H值2~7范围内均有较高的UO2+2去除率;FHA93在60 min内达到饱和吸附量的98%;热失重分析和耐酸性实验测试结果表明FHA200有更好的热稳定性和耐酸性。因此,氟掺杂羟基磷灰石比羟基磷灰石更适合应用于含UO2+2废水处理。
The hydroxyapatite（ HA） and fluorine- substituted hydroxyapatite（ FHA93,FHA200） were synthesized by the wet chemical precipitation method. The structures of these samples were analyzed by Fourier transform infrared spectroscopy,X- rays diffraction,Thermogravimetric analysis and X- ray photoelectron spectra. Meanwhile,we also explored the capacities for removal of uranyl（ UO2^2＋） from model wastewater. The effects of the different factors such as p H values,initial UO2^2＋concentration,adsorption time and temperature on the adsorption of UO2^2＋by hydroxyapatite and fluorine- substituted hydroxyapatite were examined. The results show that the maximum removal rate of HA,FHA93 and FHA200 is about99. 5%. The equilibrium adsorption data is found to be well described by Langmuir model,and the pseudo- second- order rate model fits the adsorption kinetic data. When the p H is ranged with 2 ~ 7,FHA200 exhibites excellent removal rate of UO2^2＋. Furthermore,FHA93 reached the saturated adsorption capacity of 98% in 60 min. The thermogravimetric analysis and anti- acids tests also indicate that the FHA200 has the best thermal stability and acid resistance among these three materials. Accordingly,we found that the fluorine- substituted hydroxyapatite is more suitable for the treatment of UO2^2＋- containing waste water.
出处
《西南科技大学学报》
CAS
2015年第2期1-6,50,共7页
Journal of Southwest University of Science and Technology
基金
国家自然科学基金青年基金(31300793)
关键词
氟掺杂羟基磷灰石
热稳定性
耐酸性
吸附
UO2^2+
Fluorine-substituted hydroxyapatite
Thermal stability
Acid resistance
Adsorption
UranylUO2^2＋
