焙烧态锂铝水滑石对水中氟离子吸附性能研究  

Adsorption of fluorion from aqueous solution by calcined layered lithium/aluminum hydroxides

作　　者：成娅[1] 周家斌[1] 王磊[1] 张忠[1] 刘艳丽[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070

出　　处：《环境污染与防治》2012年第2期34-38,共5页Environmental Pollution & Control

基　　金：中国博士后科学基金资助项目(No.20090460998);教育部留学回国人员科研启动基金资助项目(教外司留2010-609);环境地球化学国家重点实验室开放基金资助项目(No.SKLEG6096)

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。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.

关 键 词：水滑石 焙烧态 氟离子 吸附 

分 类 号：X703[环境科学与工程—环境工程]