文献类型：期刊文献

英文题名：A new high-efficiency process for Li+ recovery from solutions based on LiMn2O4/λ-MnO2 materials

作者：Liu, Dong-Fan[1]; Sun, Shu-Ying[1]; Yu, Jian-Guo[1]

机构：[1] National Engineering Research Center for Integrated Utilization of Salt Lake Resource, East China University of Science and Technology, Shanghai, 200237, China

年份：2019

卷号：377

外文期刊名：Chemical Engineering Journal

收录：EI(收录号：20183705791085)

语种：英文

外文关键词：Electrodes - Recovery - Desorption - Ion exchange - Manganese - Efficiency - Ions - Manganese oxide - Lithium

摘要：The manganese loss of lithium ion-sieves was high in the acid desorption process. Thus, electrically switched ion exchange (ESIX) has been investigated attempting to recover Li+ from brine in recent years. A new high-efficiency process for Li+ recovery from solutions was successfully applied in this study based on LiMn2O4/λ-MnO2 structures. The adsorption and desorption happened simultaneously at positive and negative electrodes, respectively. The adsorption rates increased with the increasing operating voltages. The adsorption capacity was 3.5 mmol·g?1 under the optimal voltage (0.75 V). Besides, the adsorption rates and adsorption capacities were mainly affected by operating temperatures, initial Li+ concentrations in adsorption solutions, and initial Li+ concentrations in desorption solutions, respectively. All the experiments results showed lower manganese losses (less than 0.05%) in desorption than traditional methods (1.2%–2.5%). The XRD results denoted that the λ-MnO2 electrode converted into the LiMn2O4 electrode after adsorption. On the contrary, the LiMn2O4 electrode converted back into the λ-MnO2 electrode after desorption. Cyclic experiments indicated that the electrodes in the adsorption-desorption process exhibited excellent regenerability. ? 2018 Elsevier B.V.