Lithium and boron recovery from salt lake brine is highly important for resource utilization and environmental risk reduction, particularly as an alternative source of the critical raw lithium materials for lithium ion batteries. This study develops a novel capacitive deionization (CDI) method to simultaneously and precisely extract Li⁺ and B(OH)₄^- ions from salt lake brine with high Mg/Li ratio. Using oxygen vacancy-rich CoP/Co₃O₄-graphene aerogel (GA/CoP/Co₃O₄) as the bifunctional anode and cathode, the effective adsorption capacity of Li⁺ and B(OH)₄^- ions reached 37 mg/g and 70 mg/g, respectively at the Mg/Li ratio of 24:1 and Cl/B ratio of 70:1. The excellent selectivity and efficiency could be attributed to the synergistic effect of rich oxygen vacancy, better hydrophilicity, flexible P-metal interaction and low internal resistance. The CDI system also has a good and stable performance of electrochemical adsorption-desorption, reaching >92% of recovery after 10 cycles. This paper provides a green and efficient method for recovery of valuable elements from salt lake brine and reduction of environmental risk.

从盐湖盐水中回收锂和硼对于资源利用和降低环境风险至关重要，尤其是作为锂离子电池关键锂原料的替代来源。这项研究开发一种新颖的电容去离子（CDI）的方法来同时且精确地提取锂⁺和B（OH）₄ ^-盐湖卤水离子与高镁/锂比。使用富含氧气的空位-COP / Co的₃ ö ₄ -graphene气凝胶（GA / COP / Co的₃ ö ₄）作为双官能团的阳极和阴极，Li的有效吸附容量⁺和B（OH）₄ ^-Mg / Li比为24：1和Cl / B比为70：1时，离子分别达到37 mg / g和70 mg / g。优异的选择性和效率可归因于富氧空位，更好的亲水性，灵活的P-金属相互作用和低内阻的协同效应。CDI系统还具有良好且稳定的电化学吸附-解吸性能，经过10个循环后，回收率> 92％。本文提供了一种绿色高效的方法，可从盐湖盐水中回收有价值的元素并降低环境风险。