偏钛酸型锂吸附剂的合成及吸附性能  

Synthesis and adsorption property of H_2TiO_3 type adsorbent

作　　者：张丽芬[1] 陈白珍[1] 石西昌[1] 马立文[1] 陈亚[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2010年第9期1849-1854,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家科技支撑计划"十一五"重大项目(2008BAB35B04)

摘　　要：以TiO2和Li2CO3为原料,采用固相法合成偏钛酸型锂吸附剂前躯体Li2TiO3,将该前躯体经过盐酸洗脱锂,得到偏钛酸型锂吸附剂H2TiO3,其中锂的抽出率达到98.86%,钛几乎不溶损。对TiO2、Li2TiO3、H2TiO3以及H2TiO3吸附锂后的样品进行XRD和SEM表征。研究偏钛酸型锂吸附剂H2TiO3对锂离子的吸附性能,并用伪一级动力学方程和伪二级动力学方程对吸附过程进行拟合,计算相应的速率常数。结果表明:H2TiO3对锂离子具有较大的吸附能力,在LiOH溶液中对锂离子的吸附容量为39.8mg/g;吸附过程符合伪二级动力学方程,表明吸附过程主要为化学吸附,吸附平衡数据符合Langmuir等温吸附方程。H2TiO3 type adsorbent was obtained by acid-modifying adsorbent precursor Li2TiO3,which was synthesized by a simple solid-phase reaction between Li2CO3 and TiO2.The extraction rate of Li＋ from Li2TiO3 is 98.86%,and while almost no Ti4＋ is extracted.TiO2,Li2TiO3,H2TiO3 and products of H2TiO3 adsorbing Li＋ were characterized by XRD and SEM.The lithium adsorption properties were investigated by adsorption kinetics and adsorption isotherm.The kinetic data were studied by the pseudo-first-order and pseudo-second-order kinetic models.The rate constants of adsorption for these kinetic models were calculated.The results indicate that H2TiO3 type adsorbent shows superior adsorptive capacity of Li＋,with the value of 39.8 mg/g in LiOH solution.The adsorption process obeys pseudo-second-order rate equation,and the process can be seen as chemical adsorption.The equilibrium data can be described well by the Langmuir isotherm equation.

关 键 词：锂吸附剂 Li2TiO3 吸附动力学 伪二级动力学 

分 类 号：O614.111[理学—无机化学]