In recent decades, considerable amounts of rare earth elements have been used and then released into industrial wastewater, which caused serious environmental problems. In this work, in order to recycle rare earth cations (La³⁺ and Ce³⁺) from aqueous solutions, MnFe₂O₄-Graphene oxide magnetic nanoparticles were synthesized and after characterization studies, their adsorption isotherms, kinetics, thermodynamics and desorption were comprehensively investigated. Characterized was performed using XRD, FE-SEM, FT-IR, Raman spectroscopy, VSM, BET and DLS. REE adsorption on MnFe₂O₄-GO was studied for the first time in the present work and the maximum adsorption capacity at the optimum condition (room temperature and pH = 7) for La³⁺ and Ce³⁺ were 1001 and 982 mg/g respectively, and the reactions were completed within 20 min. In addition, the adsorption data were well matched with the Langmuir model and the adsorption kinetics were fitted with the pseudo-second order model. The thermodynamic parameters were calculated and the reactions were found to be endothermic and spontaneous. Moreover, the Dubinin-Radushkevich model predicted chemical ion-exchange adsorption. Desorption studies also demonstrated that MnFe₂O₄-GO can be regenerated for multiple reuses. Overall, high adsorption capacity, chemical stability, reusability, fast kinetics, easy magnetic separation, and simple synthesis method indicated that MnFe₂O₄-GO is a high-performance adsorbent for REE.

近几十年来，已经使用了大量的稀土元素，然后将其释放到工业废水中，这引起了严重的环境问题。在这项工作中，为了从水溶液中回收稀土阳离子（La ³⁺和Ce ³⁺），合成了MnFe ₂ O _4-氧化石墨烯磁性纳米粒子，并进行了表征研究，它们的吸附等温线，动力学，热力学和解吸经过全面调查。使用XRD，FE-SEM，FT-IR，拉曼光谱，VSM，BET和DLS进行表征。REE在MnFe ₂ O ₄上的吸附-GO是本研究的首次研究，在最佳条件（室温和pH = 7）下，La ³⁺和Ce ³⁺的最大吸附容量分别为1001和982 mg / g，反应为在20分钟内完成。另外，吸附数据与Langmuir模型很好地匹配，并且吸附动力学与伪二级模型拟合。计算热力学参数，发现反应是吸热的和自发的。此外，Dubinin-Radushkevich模型预测了化学离子交换吸附。解吸研究还表明，MnFe ₂ O ₄-GO可以重新生成以进行多次重用。总的来说，高吸附容量，化学稳定性，可重复使用性，快速动力学，易磁分离和简单的合成方法表明，MnFe ₂ O ₄ -GO是稀土金属的高性能吸附剂。