Abstract：
Research on the recovery of rare earth elements from wastewater has attracted increasing attention. Compared with other methods, biosorption is a simple, efficient, and environmentally friendly method for rare earth wastewater treatment, which has greater prospects for development. The objective of this study was to investigate the biosorption behavior and mechanism of Yarrowia lipolytica for five rare earth ions (La3⁺, Nd3⁺, Er3⁺, Y3⁺, and Sm3⁺) with a particular focus on biosorption behavior, biosorption kinetics, and biosorption isotherm. It was demonstrated that the biosorption capacity of Y. lipolytica at optimal conditions was 76.80 mg/g. It was discovered that the biosorption process complied with the pseudo-second-order kinetic model and the Langmuir biosorption isotherm, indicating that Y. lipolytica employed a monolayer chemical biosorption process to biosorb rare earth ions. Characterization analysis demonstrated that the primary functional groups involved in rare earth ion biosorption were amino, carboxyl, and hydroxyl groups. The cooperative biosorption of rare earth ions by Y. lipolytica was facilitated by means of surface complexation, ion exchange, and electrostatic interactions. These findings suggest that Y. lipolytica has the potential to be an effective biosorbent for the removal of rare earth elements from wastewater.
摘要：
从废水中回收稀土元素的研究日益受到重视。与其他方法相比，生物吸附是一个简单的，高效,和环保的稀土废水处理方法，具有更大的发展前景。本研究的目的是研究Yarrowialipolytica对五种稀土离子的生物吸附行为和机理（La3，Nd3,Er3,Y3,和Sm3by)，特别关注生物吸附行为，生物吸附动力学，和生物吸附等温线。结果表明，在最佳条件下，Y的生物吸附能力为76.80mg/g。发现生物吸附过程符合伪二级动力学模型和Langmuir生物吸附等温线，表明Y.lipolytica采用单层化学生物吸附过程来生物吸附稀土离子。表征分析表明,参与稀土离子生物吸附的主要官能团为氨基,羧基，和羟基。通过表面络合促进了Y.Lipolytica对稀土离子的协同生物吸附，离子交换,和静电相互作用。这些发现表明，Y。lipolytica具有从废水中去除稀土元素的有效生物吸附剂的潜力。
