CAJ | 학술논문

以MnC(NO_3)_2,LiOH和H_2O_2为原料,通过控制水热反应条件直接合成了尖晶石型LiMn_2O_4纳米线,经酸浸脱锂后得到对Li~+具有特殊选择性吸附的离子筛.用XRD,HRTEM,SAED和共存金属离子的分配系数等手段对产物的晶相结构及吸附性能进行了研究.结果表明,水热反应条件对前驱体结构有较大影响,前驱体LLMn_2O_4和离子筛MnO_2均为一维纳米线,离子筛对不同金属离子的选择性吸附顺序为Li~+>Ca~(1+)>Mg~(2+)>Na~+>K~+,说明离子筛具有较高的Li~+选择性.Li~+的分配系数为16770.63 mL/g,是高温焙烧样品(7917.49 mL/g)的2.12倍,表明一维纳米MnO_2离子筛对Li~+的选择性吸附性能有显著提高.
이MnC(NO_3)_2,LiOH화H_2O_2위원료,통과공제수열반응조건직접합성료첨정석형LiMn_2O_4납미선,경산침탈리후득도대Li~+구유특수선택성흡부적리자사.용XRD,HRTEM,SAED화공존금속리자적분배계수등수단대산물적정상결구급흡부성능진행료연구.결과표명,수열반응조건대전구체결구유교대영향,전구체LLMn_2O_4화리자사MnO_2균위일유납미선,리자사대불동금속리자적선택성흡부순서위Li~+>Ca~(1+)>Mg~(2+)>Na~+>K~+,설명리자사구유교고적Li~+선택성.Li~+적분배계수위16770.63 mL/g,시고온배소양품(7917.49 mL/g)적2.12배,표명일유납미MnO_2리자사대Li~+적선택성흡부성능유현저제고.
Spinel-type ternary LiMn_2O_4 nanowires were synthesized via direct hydrothermal synthesis with Mn(NO_3)_2, LiOH and H_2O_22. The final low-dimensional MnO_2 nanorod ion-sieve with selective adsorption property to lithium ion was prepared and further mod/fied by acid treatment to completely extract lithium ions from the Li-Mn-O lattice. The effects of hydrothermal reaction conditions on the nanostructure, chemical stability and ion-exchange property of the LiMn_2O_4 precursor and MnO_2 ion-sieve were systematically examined via XRD, HRTEM, SAED and lithium ion selective adsorption measurement. The results show that hydrothermal reaction conditions had the considerable effect on the structure of samples. The equilibrium distribution coefficient (K_d) of these metal ions was in the order of Li~+ > Ca~(2+) > Mg~(2+) >Na~+ > K~+, indicating high selectivity for Li~+, but much less for Na~+, K~+, Ca~(2+), and Mg~(2+). The distribution coefficient for Li~+ was 16770.63 mL/g, increased about 2.12 times compared with the bulky MnO_2 ion-sieves (7917.49 mL/g), indicating remarkable improvement of the ion-sieve selectivity by the well-maintained nanowire structure.