锂是重要的战略资源,而自然界中的锂资源主要储存于如海水、盐湖水和地热水等的卤水中.离子筛吸附剂法是目前最有前途的从含锂液态资源中提取锂的方法.本文通过利用水热合成法,以Mn(NO3)2·4H2O、Na2S2O8和LiNO3为反应原料,分三个步骤制备了宽约40～80 nm、长约400～800 nm的纳米棒状尖晶石型MnO2离子筛.通过吸附实验得到离子筛对配制的稀锂溶液中锂离子最大吸附量达到20 mg/g.同时,通过吸附实验测定并计算了溶液中各碱金属和碱土金属离子的平衡分配系数Kd的次序为Na+＜K+＜＜Mg2+＜Li+,说明离子筛对锂离子具有较高的选择性,溶液中的其他碱金属离子并没有对Li+吸附造成干扰.%Lithium is a critical strategic material,and the natural resources of lithium are mainly preserved in brine water including seawater,salt lake water and geothermal water.Recent studies suggest that a promising method of lithium production has been established to develop ion-sieve sorbents that can selectively extract lithium from the Li+-contained brine water.In this paper,Mn(NO3)2·4H2O,Na2S2O8 and LiNO3 were used as precursors.Spinelcrystal MnO2 ion-sieve nanorods measuring 40～80 nm in diameter and 400-800 nm in length are synthesized via a hydrothermal reaction.The lithium uptake capacity of this synthesized ion sieve reaches to 20 mg/g with the prepared dilute lithium solution in adsorption experiments.The lithium selective adsorption properties were investigated by measuring the distribution coefficients (Kd) of a series of alkaline and alkaline earth metal ions,the Kd values are in the order of Na+ ＜ K+ ＜＜ Mg2+ ＜ Li+.The results indicate that ion sieve has a high selectivity for lithium ions,and the alkali metal ions in the solution do not interfere with Li+.
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