Spinel-structured lithium manganese oxide is regarded as one of the most promising materials that can recover Li⁺ from brine and seawater. Herein, a hierarchical porous and hydrophilic H_1.6Mn_1.6O₄@chitosan pellet (HMO@CP) is proposed and its mechanical property is tailored through the glutaraldehyde-derived cross-linking. Different characterization techniques such as scanning electron microscopy (SEM), Brunner-Emmet-Teller (BET) measurement, Fourier transformation infrared spectrum (FTIR), and X-ray diffraction (XRD) meter were used to investigate the chemical and morphological properties of the HMO@CP. H_1.6Mn_1.6O₄ powders were successfully encapsulated by chitosan, forming composite porous pellets. The equilibrium adsorption capacity of HMO@CP is 49.2 mg·g⁻¹, which is similar to that of the pristine H_1.6Mn_1.6O₄. Moreover, the adsorption behavior of HMO@CP well fits with the pseudo-second-order kinetic model, and the Langmuir model can be used to describe the adsorption isotherm of HMO@CP. Furthermore, the adsorption thermodynamic parameters such as ΔH^θ ΔG^θ and ΔS^θ were calculated based on the obtained results. When the pellet is immersed into 0.05mol·L⁻¹ HCl solution after the Li⁺ adsorption process, the desorption equilibrium can be reached within 60 min, with a manganese dissolution loss of 2.48%. The Li⁺ adsorption capacity of HMO@CP remains at 41.92 mg·g⁻¹ after five adsorption-desorption cycles, confirming the effective regeneration property of the HMO@CP. In addition, the as-prepared HMO@CP shows excellent selectivity for Li⁺ among Na⁺, K⁺, Mg²⁺, and Ca²⁺ ions in the simulated solution.

尖晶石结构的锂锰氧化物被认为是最有前途的可以从盐水和海水中回收Li ^{+ 的}材料之一。在此，提出了一种分层的多孔亲水性 H _1.6 Mn _1.6 O ₄ @壳聚糖颗粒（HMO@CP），并通过戊二醛衍生的交联来调整其机械性能。使用不同的表征技术，如扫描电子显微镜 (SEM)、Brunner-Emmet-Teller (BET) 测量、傅里叶变换红外光谱 (FTIR) 和 X 射线衍射 (XRD) 仪来研究该材料的化学和形态特性。 HMO@CP。H _1.6 Mn _1.6 O ₄粉末被壳聚糖成功包封，形成复合多孔颗粒。HMO@CP 的平衡吸附容量为49.2 mg·g ^-1，与原始H _1.6 Mn _1.6 O ₄的平衡吸附容量相似。此外，HMO@CP的吸附行为与拟二级动力学模型非常吻合，Langmuir模型可用于描述HMO@CP的吸附等温线。此外，基于所得结果计算吸附热力学参数如ΔH ^θ ΔG ^θ和ΔS ^θ。当丸粒浸入0.05mol·L ^-1 HCl溶液的锂后⁺吸附过程60 min内可达到解吸平衡，锰溶解损失为2.48%。经过五个吸附-解吸循环后，HMO@CP的 Li ⁺吸附容量保持在 41.92 mg·g ^-1，证实了 HMO@CP 的有效再生性能。此外，所制备的 HMO@CP在模拟溶液中对Na ⁺、K ⁺、Mg ²⁺和 Ca ²⁺离子中的Li ⁺显示出优异的选择性。