文献类型：期刊文献

英文题名：MnO₂ Ion Sieve Adsorbent for Recovering Lithium from Solutions

作者：Sun Shu-Ying[1];Zhang Qin-Hui[1];Yu Jian-Guo[1]

机构：[1]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2010

卷号：26

期号：4

起止页码：567

外文期刊名：CHINESE JOURNAL OF INORGANIC CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000277372300003)】；

语种：英文

外文关键词：aqueous resources of lithium; adsorption isotherm; brine; ion-sieve adsorbent; MnO2

摘要：The paper presents preparation and characterization of the MnO2 ion sieve for recovering lithium from aqueous media. Different MnO2 polymorphs, produced by low temperature hydrothermal oxidation of Mn2+ by S2O82- with or without (NH4)(2)SO4 at 393 and 423 K, were employed to prepare 4 MnO2 based ion sieve adsorbents. The structure characteristics, adsorption and ion-exchange properties of the adsorbent were studied by XRD analysis and experimental runs for the Li+ isotherms, adsorption kinetic data and the effect of initial pH value on the capacity. The capacities of SMO-b and SMO-d adsorbents for Li+ vs. its equilibrium concentration data were well fitted by the Freundlich adsorption isotherm model. The relative capacity data suggest that (NH4)(2)SO4 is not necessary for the oxidation. The first order reaction kinetics model is adequate to predict the Li+ concentration decay curves of the kinetic runs. The MnO2 based ion sieve adsorbent exhibits an order of magnitude higher capacity for Li+ than for Na+.