Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第20卷    第9期    总第138期    2010年9月

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文章编号:1004-0609(2010)09-1849-06
偏钛酸型锂吸附剂的合成及吸附性能
张丽芬, 陈白珍, 石西昌, 马立文, 陈  亚

(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

Synthesis and adsorption property of H2TiO3 type adsorbent
ZHANG Li-fen, CHEN Bai-zhen, SHI Xi-chang, MA Li-wen, CHEN Ya

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

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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