摘要
尖晶石型锰基锂离子筛(LMOs)可实现海水和卤水中锂的高效选择性提取,但其循环过程中脱锂时易造成Mn^(2+)的溶损,制约了其实际应用。通过水热法合成了Al掺杂的尖晶石型Li1.6Mn_(1.6)O_(4)(LMO)前驱体,经酸洗后得到Al掺杂的尖晶石型锂离子筛H_(1.6)Mn_(1.6)O_(4)(HMO)。结果表明,在掺杂5%的时候,锂吸附容量最大为27.8mg/g(C_(Li+)=250 mg/L),相比未掺杂的20.6mg/g,提高了35.95%。Li^(+)脱附率由未掺杂的87.44%提升为97.60%,提高了11.62%。锰溶损率由未掺杂的4.12%降低为3.36%,相比,降低了18.45%。得出Al掺杂能提高HMO对锂的吸附容量,且在保持较高吸附容量条件下,掺杂有效提高其结构稳定性,Langmuir和pseudo-second-order模型能够很好的拟合Al掺杂的HMO对Li^(+)的吸附过程。
Spinel-type manganese-based lithium ion sieves(LMOs)can achieve efficient and selective extraction of lithium from seawater and brine,but their cyclic process of lithium removal is prone to dissolution loss of Mn^(2+),which restricts their practical application.In this paper,Al-doped spinel-type Li 1.6 Mn_(1.6)O_(4)(LMO)precursors were synthesized by a hydrothermal method,and Al-doped spinel-type lithium ion sieves H_(1.6)Mn_(1.6)O_(4)(HMO)were obtained by acid washing.The results showed that the maximum lithium adsorption capacity was 27.8 mg/g(C_(Li+)=250 mg/L)at 5%doping,which was 35.95%higher compared with 20.6 mg/g undoped.The Li^(+)desorption rate was increased from 87.44%undoped to 97.60%,which was 11.62%higher.The manganese dissolution loss rate was reduced from 4.12%undoped to 3.36%,18.45%lower.It is concluded that Al doping can improve the adsorption capacity of HMO for lithium,and the doping effectively improves its structural stability under the condition of maintaining a higher adsorption capacity.The Langmuir and pseudo-second-order models can well fit the adsorption process of Al-doped HMO for Li^(+).
作者
蔡修贤
周冰冰
刘肖
李凤华
CAI Xiuxian;ZHOU Bingbing;LIU Xiao;LI Fenghua(School of Metallurgy,Northeastern University,Shenyang 110819,China)
出处
《功能材料》
北大核心
2025年第7期7209-7216,7236,共9页
Journal of Functional Materials
关键词
锂离子筛
锰溶损
吸附性能
掺杂改性
水热法
lithium ion sieves
Mn^(2+)dissolution loss
adsorption performance
doping modification
hydrothermal
