Fujian Key Laboratory of Pollution Control and Resource Reuse, College of Environmental and Resource Sciences, College of Carbon Neutral Modern Industry, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
Fujian Key Laboratory of Pollution Control and Resource Reuse, College of Environmental and Resource Sciences, College of Carbon Neutral Modern Industry, Fujian Normal University, Fuzhou 350007, Fujian Province, China.
Sci Total Environ. 2024 Nov 25;953:176147. doi: 10.1016/j.scitotenv.2024.176147. Epub 2024 Sep 10.
The recovery of rare earth elements (REEs) is a major issue based on environmental governance and sustainable resource utilization. In this study, we developed a novel hydrogel material (Fe/Mn@ALG) by anchoring Fe/Mn NPs on alginate spheres, where Fe/Mn NPs were in-situ synthesized using Euphorbia cochinchensi leaf extract as reduced and protection agents. The Fe/Mn@ALG was applied directly to real mine wastewater, generating efficient and selective recovery of REEs with the coexistence of numerous competing metal ions. As results have shown, Fe/Mn@ALG was a useful adsorbent for REEs with an adsorption efficiency 78.62 % achieved, which was also confirmed by distribution coefficients (K), up to 2451.66 mL·g. Furthermore, Fe/Mn@ALG exhibited preferential response to REEs over other metal ions with the separation factor (SF) being up to 240. This great adsorption performance and selectivity toward REEs were attributed to its specific surface area, oxygen-rich functional groups and negatively charged surface in acid wastewater. Furthermore, REEs could be greatly desorbed from Fe/Mn@ALG with output concentration being three times higher than the initial concentration. Additionally, Fe/Mn@ALG maintained its good adsorption performance with efficiency reaching 72.24 % after five reuses. Overall, Fe/Mn@ALG can be considered as a promising candidate for wastewater remediation and sustainable management of resources.
从环境治理和可持续资源利用的角度来看，回收稀土元素（REEs）是一个主要问题。在本研究中，我们通过将 Fe/Mn NPs 锚定在藻酸盐球体上，开发了一种新型水凝胶材料（Fe/Mn@ALG），其中 Fe/Mn NPs 是使用大戟叶提取物作为还原和保护剂原位合成的。Fe/Mn@ALG 直接应用于实际矿山废水中，在存在多种竞争金属离子的情况下，实现了 REEs 的高效和选择性回收。结果表明，Fe/Mn@ALG 是一种有效的 REEs 吸附剂，其吸附效率达到 78.62%，分配系数（K）高达 2451.66 mL·g。此外，Fe/Mn@ALG 对 REEs 表现出优于其他金属离子的优先响应，分离因子（SF）高达 240。这种对 REEs 的巨大吸附性能和选择性归因于其较大的比表面积、富含氧的官能团和酸性废水中带负电荷的表面。此外，用 Fe/Mn@ALG 从 REEs 中解吸效果良好，输出浓度比初始浓度高 3 倍。此外，Fe/Mn@ALG 在经过五次重复使用后仍保持良好的吸附性能，效率达到 72.24%。总体而言，Fe/Mn@ALG 可以被认为是废水修复和资源可持续管理的一种有前途的候选材料。
