Manfredi C, Amoruso A J, Ciniglia C, Iovinella M, Palmieri M, Lubritto C, El Hassanin A, Davis S J, Trifuoggi M
Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126, Naples, Italy.
Department of Chemical Sciences, University of Naples Federico II, Via Cintia, I-80126, Naples, Italy.
Chemosphere. 2023 Mar;317:137818. doi: 10.1016/j.chemosphere.2023.137818. Epub 2023 Jan 11.
The recovering of trivalent Lanthanides from aqueous solutions, by biosorption process onto Galdieria sulphuraria lifeless cells, was investigated. Potentiometry, UV-Vis, FTIR-ATR spectroscopy and SEM-EDS analysis were used. All the experiments were performed at 25 °C, in 0.5 M NaCl. Ln biosorption is greater in the 5-6 pH range with values ranging from 80 μmol/g to 130 μmol/g (dry weight). The adsorbed Ln ions can be recovered at higher acidity (pH<1) and the biosorbent can be reused. Specific molecular interactions between Ln ions and the functional groups on G. sulphuraria surface were highlighted. Particularly, proteins are involved if Ln=Pr, Sm, Eu, Tb, Dy, Tm, while Ce, Ho, Er form bonds with carbohydrates. Finally, both proteins and carbohydrates are involved if Gd and Yb. A Surface Complexation approach, with a good graphical fitting to potentiometric experimental collected data, was used to describe the biosorption mechanism. This study could be of great applicative utility for removing of trivalent actinides, from waste aqueous solutions, by biosorption. As well known the lanthanides were used as model to simulate the chemical behaviour of actinides in the same oxidation state.
研究了通过将三价镧系元素吸附到嗜硫盖迪酵母无生命细胞上，从水溶液中回收三价镧系元素的过程。采用了电位滴定法、紫外可见光谱法、傅里叶变换红外光谱衰减全反射法（FTIR-ATR）和扫描电子显微镜-能谱分析法（SEM-EDS）。所有实验均在25℃、0.5M NaCl溶液中进行。在pH值为5-6的范围内，镧系元素的生物吸附量更大，范围为80μmol/g至130μmol/g（干重）。吸附的镧系离子可在较高酸度（pH<1）下回收，且生物吸附剂可重复使用。突出了镧系离子与嗜硫盖迪酵母表面官能团之间的特定分子相互作用。特别是，当镧系元素为镨、钐、铕、铽、镝、铥时，蛋白质参与其中；而铈、钬、铒则与碳水化合物形成键。最后，当镧系元素为钆和镱时，蛋白质和碳水化合物都参与其中。采用表面络合方法，对电位滴定实验收集的数据进行了良好的图形拟合，以描述生物吸附机理。这项研究对于通过生物吸附从废水中去除三价锕系元素可能具有很大的应用价值。众所周知，镧系元素被用作模型来模拟相同氧化态下锕系元素的化学行为。
