The Application Performance of NaA Zeolite for the Separation and Regeneration of Co2+ and Li+ from the Simulated Leaching Solution of Spent Lithium-ion Batteries
LIU Xiangyu, CHENG Qian*, WANG Yue, WANG Yongxiang
School of Environmental Science and Engineering, Xiamen University of Technology, Xiamen 361024, Fujian, China
Abstract: The utilization of NaA zeolite as an adsorbent for the selective separation and regeneration of Co2+ and Li+ from a simulated leaching solution of spent lithium-ion batteries has been explored. The selective adsorption behavior and mechanism of the NaA zeolite towards Co2+ were investigated. The morphology and structure of the NaA zeolite before and after adsorption were characterized using SEM-EDS, FTIR and XRD techniques. Experimental results indicated that the optimal dosage of NaA zeolite increased with the increase in the initial molar concentration of Co2+ and Li+ in the mixed solution. Under the condition of an initial molar concentration of 0.05 mol/L for both Co2+ and Li+, a NaA zeolite dosage of 35 g/L, an initial solution pH of 5, an adsorption temperature of 60 ℃, and the adsorption time was 30 min, the adsorption efficiencies of Co2+ and Li+ were 95.8% and 2.5%, respectively. This underscores the remarkable ability of NaA zeolite to selectively capture Co2+ from the simulated leaching solution, thereby facilitating the effective separation of Co2+ and Li+. The adsorption behavior of Co2+ onto NaA zeolite was found to adhere to the Langmuir isotherm model and pseudo-second-order kinetics, with a maximum adsorption capacity of 108.7 mg/g. The mechanism underlying this process was primarily ion exchange, where Co2+ was adsorbed and bound to the surface of the zeolite without altering its morphology or structure. Notably, the separated Li+ from the simulated leaching solution and the desorbed Co2+ could be successfully regenerated into Li2CO3 with a purity of 97.5% and CoCO3 with a purity of 99.2%, yielding production rates of 95.2% and 96.1%, respectively. This study provides new insights into separation, recovery and reuse of metal ions from spent lithium-ion batteries using NaA zeolite.
刘翔宇, 程前, 王越, 王永相. NaA型分子筛在废锂电池模拟浸出液中的钴锂金属离子分离和再生应用性能[J]. 材料导报, 2025, 39(22): 24090136-7.
LIU Xiangyu, CHENG Qian, WANG Yue, WANG Yongxiang. The Application Performance of NaA Zeolite for the Separation and Regeneration of Co2+ and Li+ from the Simulated Leaching Solution of Spent Lithium-ion Batteries. Materials Reports, 2025, 39(22): 24090136-7.
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2025, Vol. 39 
