(1. 重庆大学 化学化工学院，重庆 400030；
2. 重庆工商大学 环境与生物工程学院，重庆 400067)
摘 要: 以水热法自制γ-MnOOH和LiOH？H2O为原料，在较低温度下固相反应制备出尖晶石型Li4Mn5O12，经酸浸脱锂后得到对Li+具有特殊选择性的MnO2离子筛。研究该离子筛对Li+的吸附性能和选择性，并用XRD、SEM和FT-IR等和Li+选择性吸附研究固相反应工艺对离子筛材料结构、化学组成及离子交换性质的影响。结果表明：煅烧时间对前驱体的生成有较大影响，由400 ℃煅烧32 h所得的前驱体为纯相Li4Mn5O12化合物，经酸浸脱锂后的离子筛仍保持与前驱体相同的尖晶石结构；锰源γ-MnOOH、前驱体Li4Mn5O12和离子筛MnO2均为低维棒状结构形貌；离子筛对锂的吸附速率符合一级动力学Lagergren方程，饱和吸附容量为40.2 mg/g，并具有较好的Li+选择性。
关键字: Li4Mn5O12；离子筛；前驱体；吸附
（1. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, China;
2. School of Environmental and Biological Engineering, Chongqing Technology and Business University,
Chongqing 400067, China）
Abstract:Spinel-type Li4Mn5O12 precursors were synthesized from γ-MnOOH self-prepared by hydro-thermal method and LiOH·H2O by low temperature solid-phase reaction. Furthermore, MnO2 ion-sieves with Li+ selective adsorption property were prepared by the acid treatment process to extract Li+ from the spinel Li4Mn5O12 precursor. The effects of solid-phase reaction process on the structure, chemical composition and ion-exchange property of the ion-sieve material were investigated by XRD, SEM, FT-IR and Li+ selective adsorption measurements. The results show that calcination time has the considerable effect on the precursor. The precursor synthesized at 400 ℃ for 32 h is a pure Li4Mn5O12. Final MnO2 ion-sieve and Li4Mn5O12 precursor have a low-dimensional rod-like morphology link γ-MnOOH and share the same structure of spinel. The adsorption rate of ion-sieve is consistent with the pseudo-first order kinetic equation of Lagergren. The Li+ saturated adsorption capacity is 40.2 mg/g, and the ion-sieve shows good Li+ selection.
Key words: Li4Mn5O12; ion-sieve; precursor; adsorption
