涂玉鑫, 李田玉, 陈佳煌, 王瑞祥, 徐志峰, 刘志楼. 固相法合成钴掺杂锰系锂离子筛的吸附性能研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.05.10.004
引用本文: 涂玉鑫, 李田玉, 陈佳煌, 王瑞祥, 徐志峰, 刘志楼. 固相法合成钴掺杂锰系锂离子筛的吸附性能研究[J]. 工程科学学报. DOI: 10.13374/j.issn2095-9389.2024.05.10.004
Study of lithium adsorption performance of Co doped manganese based lithium ion sieves prepared by solid phase synthesis[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.05.10.004
Citation: Study of lithium adsorption performance of Co doped manganese based lithium ion sieves prepared by solid phase synthesis[J]. Chinese Journal of Engineering. DOI: 10.13374/j.issn2095-9389.2024.05.10.004

固相法合成钴掺杂锰系锂离子筛的吸附性能研究

Study of lithium adsorption performance of Co doped manganese based lithium ion sieves prepared by solid phase synthesis

  • 摘要: 随着全球对锂的需求不断增加,从锂沉淀母液中提取锂受到了极大的关注。锰系离子筛(LMO)是一种具有优异应用前景的吸附剂,其能实现复杂溶液中锂的高效回收。然而,LMO在酸洗过程中面临着锰溶损严重的难题,降低了吸附性能。针对上述问题,本研究提出引入Co3+掺杂降低LMO锰溶解损失的策略,制备了钴掺杂锰系离子筛(LCMO)。采用X射线衍射、扫描电子显微镜等方法对不同煅烧温度和焙烧时间下制备的LCMO进行表征分析。表征结果表明,Co掺杂对LMO的尖晶石结构没有影响,并且Co最佳掺杂量为5%,此时离子筛前驱体中Mn3+的含量从未掺杂的9.67%降到3.63%,对应的锂吸附容量显著增加, 可达41.7 mg·g?1,大大地增加了离子筛的实际应用可能性。制备的5%钴掺杂的离子筛(HCMO?5%)具有良好的循环性能,Li+的吸附能力在5次循环后仍然保持在81%以上。在模拟的锂沉淀母液中,Li/Na之间的分离系数为74.68,这证明了HCMO?5%能有效地从高钠溶液中吸附Li+。因此,HCMO?5%离子筛具有从锂水资源中提取Li+的应用前景。

     

    Abstract: As global demand for lithium continues to rise, the extraction of lithium from lithium precipitation mother liquor has garnered significant attention. The manganese ion sieve (LMO) is a promising adsorbent, which can effectively adsorb lithium from complex solution. However, its inherent dissolution loss greatly restricts its practical application. In this study, introduced Co3+ doping to mitigate the manganese loss in LMO, resulting in the preparation of cobalt?doped manganese?based ion sieves (LCMO). LCMO prepared at various calcination temperatures and times were characterized using X?ray diffraction and scanning electron microscopy. The characterization results indicate that Co doping has no effect on the spinel structure of LMO, and Co doping amount of 5% can reduce the content of Mn3+ from 9.67% in the undoped precursor to 3.63%,significantly enhancing the lithium adsorption capacity to 41.7mg·g?1, greatly increasing the possibility of practical application. The 5% cobalt?doped ion sieve (HCMO?5%) has good cycling performance, and the adsorption capacity of Li+ remains above 81% after 5 cycles. In the simulated lithium precipitation mother liquor, the separation coefficient between Li/Na is 74.68, which proves that HCMO?5% can effectively adsorb Li+ from high sodium solutions. Therefore, HCMO?5% ion sieve has the application prospect of extracting Li+ from lithium water resources.

     

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