以水热法自制γ-MnOOH和LiOH?H 2 O为原料，在较低温度下固相反应制备出尖晶石型Li 4 Mn 5 O 12，经酸浸脱锂后得到对Li+具有特殊选择性的MnO 2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Li 4 Mn 5 O 12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Li 4 Mn 5 O 12和离子筛MnO 2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。
Spinel-type Li4Mn5O12 precursors were synthesized fromγ-MnOOH self-prepared by hydro-thermal method and LiOH·H 2 O by low temperature solid-phase reaction. Furthermore, MnO 2 ion-sieves with Li+ selective adsorption property were prepared by the acid treatment process to extract Li+from the spinel Li 4 Mn 5 O 12 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 MnO 2 ion-sieve and Li 4 Mn 5 O 12 precursor have a low-dimensional rod-like morphology linkγ-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.
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