中文摘要：

采用尿素水热法合成了不同摩尔比的锂铝水滑石（Li/Al LDHs）,经480℃煅烧后制备出焙烧态锂铝水滑石（Li/AlLDOs）。研究了Li/Al LDOs对水中氟离子的吸附性能,分别考察了吸附时间、吸附温度和pH等因素对吸附效果的影响,并对吸附机制进行了探讨。结果表明,Li/Al LDOs吸附水中氟离子的行为符合准二级动力学方程,吸附等温数据符合Freundlich吸附等温方程,pH对吸附效果影响较大。X射线衍射分析表明,水滑石样品经历了物相转变及重构过程,Li/Al LDOs可有效去除水体中的氟离子。

英文摘要：

Series of lithium/aluminum hydroxides（Li/Al LDHs） with different molar ratio of Li＋ to Al3＋ were prepared by a hydrothermal method using urea as precipitant.After calcinations at 480 ℃,Li/Al LDHs were converted to Li/Al LDOs products.The removal of fluorion from aqueous solutions by adsorption on Li/Al LDOs products were investigated to determine the effects of contact time,initial fluorion concentration,temperature and pH on the adsorptive capacity for fluorion.The adsorption mechanism was discussed.The results showed that the adsorption of fluorion by Li/Al LDOs follows pseudo-second-order kinetics equations.The adsorption isotherm experimental data were well fitted by Freundlich equation.The pH of initial aqueous solutions was the key factor that influences the adsorption capacity of Li/Al LDOs.The phase evolution and reconstruction during the adsorption process were confirmed by X-ray diffraction（XRD）.The Li/Al LDOs products were found to be effective adsorbent for the removal of fluorion from aqueous solutions.