文献类型：期刊文献

英文题名：Preparation and Lithium Adsorption Properties of Low-dimensional Cubic Li₄Mn₅O₁₂ Nanostructure

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：25

期号：6

起止页码：626

外文期刊名：JOURNAL OF INORGANIC MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000279512400013)】；

语种：英文

外文关键词：low-dimensional; ion-sieve; Li4Mn5O12; adsorption; lithium

摘要：Pure beta-MnO2 oxide was synthesized by hydrothermal synthesis of MnSO4 center dot H2O and (NH4)(2)S2O8. Spinel-type Li4Mn5O12 precursors were synthesized via low temperature solid-phase reaction. Furthermore, MnO2 ion-sieves with Li+ selective adsorption property were prepared by the acid treatment process to completely extract Li+ from the spinel Li4Mn5O12 precursor. 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 XRD, HRTEM, SAED, and Li+ selective adsorption measurements. The results show that Li4Mn5O12 precursor and final MnO2 ion-sieve are effectively controlled within low-dimensional structure, indicating that low temperature solid-phase reaction is more favorable to control the nanocrystalline structure than traditional high-temperature calcination process. The Li+ selective adsorption capacity is improved remarkably to 6.6 mmol/g at equilibrium and about 5.0 mmol/g at the initial Li+ concentration of only 5.0 mmol/L, which is significant for lithium extraction from aqueous solutions with very low lithium content.