文献类型：期刊文献

英文题名：Lithium selective adsorption on 1-D MnO2 nanostructure ion-sieve

作者：Zhang, Qin-Hui[1]; Li, Shao-Peng[1]; Sun, Shu-Ying[1]; Yin, Xian-Sheng[1]; Yu, Jian-Guo[1]

机构：[1] State Key Lab of Chemical Engineering, College of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2009

卷号：20

期号：5

起止页码：432

外文期刊名：Advanced Powder Technology

收录：EI(收录号：20094512437273)

语种：英文

外文关键词：Nanocrystals - Temperature - Ions - Pore size - Hydrothermal synthesis - Lithium compounds - Lithium - X ray diffraction - Electron diffraction - Molecular sieves - High resolution transmission electron microscopy - Ion exchange - Manganese oxide - Nanorods - Sieves - Solutions

摘要：β-MnO2, spinel-type Li4Mn5O12 and pure cubic phase MnO2 nanorod, with the size about 20-140 nm in diameter and 0.8-4 μm in length, were synthesized via a combination of hydrothermal synthesis and low temperature solid-phase reaction, more favorable to control the nanocrystalline structure with well-defined pore size distribution and high surface area than the traditional high temperature calcination process. Further, the MnO2 ion-sieves with lithium selective adsorption property were prepared by the acid treatment process to completely extract lithium from the spinel Li4Mn5O12 precursor with little change to the Mn-O lattice structure and the 1-D nanorod morphology. The effects of hydrothermal and solid-phase reaction process on the nanostructure, chemical stability and ion-exchange property of the ion-sieve material were examined with powder X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), N2 adsorption-desorption at 77 K, and Li+ selective adsorption measurements. The lithium selective adsorption capacity was improved remarkably to 6.62 mmol g-1 at equilibrium and about 5 mmol g-1 at the initial lithium concentration of only 5.0 mmol l-1, which is significant for lithium extraction from aqueous solutions with very low lithium content. ? 2009 The Society of Powder Technology Japan.