Al-Nadabi Hamed, Jellali Salah, Hamdi Wissem, Al-Tamimi Afrah, Al-Raeesi Ahmed, Al-Sidairi Ahmed, Al-Busaidi Waleed, Al-Hanai Ahlam, Al-Zeidi Khalifa, Al-Wardy Malik, Jeguirim Mejdi
Centre for Environmental Studies and Research, Sultan Qaboos University, Al-Khoud 123, Muscat P.O. Box 17, Oman.
Higher Institute of the Sciences and Techniques of Waters, University of Gabes, Gabes 6033, Tunisia.
Materials (Basel). 2025 May 14;18(10):2283. doi: 10.3390/ma18102283.
In this research work, a natural sample from an Omani magnetite (MG) deposit was used for the synthesis of a magnetite decorated with ferrihydrite (MG-Fh), and two lanthanum (La)-modified materials at mass percentages of 5% (MG-Fh-La-5) and 15% (MG-Fh-La-15). These materials were first characterized using various analytical techniques. Then, their phosphorus (P) recovery efficacy from aqueous solutions was studied in batch mode under a wide range of experimental conditions. The characterization results show that compared to the raw feedstock, MG-Fh, MG-Fh-La-5, and especially MG-Fh-La-15 have improved structural, textural, and surface chemistry properties. Adsorption tests indicate that due to the deposition of high contents of lanthanum oxides on its surface, the MG-La-15 exhibited a large P uptake capacity (34.5 mg g), which is significantly superior to those determined for MG-La-5 (24.3 mg g), MG-Fh (12.4 mg g), and various engineered materials published in the literature. Moreover, these materials retain an interesting ability to recover P from real wastewater with a highest adsorbed mass of 27.3 mg g, observed for MG-La-15. The P recovery seems to involve both physical and chemical mechanisms, including electrostatic interactions and complexation. This research work shows that La-modified magnetite can be considered a promising and eco-friendly material for P recovery from liquid effluents.
在这项研究工作中，使用阿曼磁铁矿（MG）矿床的天然样品合成了用纤铁矿修饰的磁铁矿（MG-Fh），以及两种质量百分比分别为5%（MG-Fh-La-5）和15%（MG-Fh-La-15）的镧（La）改性材料。首先使用各种分析技术对这些材料进行了表征。然后，在广泛的实验条件下，以分批模式研究了它们从水溶液中回收磷（P）的效果。表征结果表明，与原始原料相比，MG-Fh、MG-Fh-La-5，尤其是MG-Fh-La-15具有改善的结构、织构和表面化学性质。吸附试验表明，由于其表面沉积了高含量的氧化镧，MG-La-15表现出较大的磷吸收容量（34.5 mg/g），明显优于MG-La-5（24.3 mg/g）、MG-Fh（12.4 mg/g）以及文献中报道的各种工程材料。此外，这些材料具有从实际废水中回收磷的有趣能力，MG-La-15的最高吸附量为27.3 mg/g。磷的回收似乎涉及物理和化学机制，包括静电相互作用和络合作用。这项研究工作表明，镧改性磁铁矿可被视为一种从液体废水中回收磷的有前景的环保材料。
