CAJ | 학술논문

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。
이수열법자제γ-MnOOH화LiOH?H 2 O위원료，재교저온도하고상반응제비출첨정석형Li 4 Mn 5 O 12，경산침탈리후득도대Li+구유특수선택성적MnO 2리자사。연구해리자사대Li+적흡부성능화선택성，병용XRD、SEM화FT-IR등화Li+선택성흡부연구고상반응공예대리자사재료결구、화학조성급리자교환성질적영향。결과표명：단소시간대전구체적생성유교대영향，유400℃단소32 h소득적전구체위순상Li 4 Mn 5 O 12화합물，경산침탈리후적리자사잉보지여전구체상동적첨정석결구；맹원γ-MnOOH、전구체Li 4 Mn 5 O 12화리자사MnO 2균위저유봉상결구형모；리자사대리적흡부속솔부합일급동역학Lagergren방정，포화흡부용량위40.2 mg/g，병구유교호적Li+선택성。
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.