(中南大学 冶金科学与工程学院，长沙 410083)
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39.8 mg/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。
关键字: 锂吸附剂；Li2TiO3；吸附动力学；伪二级动力学
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: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.
Key words: lithium adsorbent；Li2TiO3；adsorption kinetics; pseudo-second-order kinetics
