Ramirez Paula Duenas, Lee Chaedong, Fedderwitz Rebecca, Clavijo Antonia R, Barbosa Débora P P, Julliot Maxime, Vaz-Ramos Joana, Begin Dominique, Le Calvé Stéphane, Zaloszyc Ariane, Choquet Philippe, Soler Maria A G, Mertz Damien, Kofinas Peter, Piao Yuanzhe, Begin-Colin Sylvie
Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504, University of Strasbourg, CNRS, 67034 Strasbourg, France.
Graduate School of Convergence Science and Technology, Seoul National University, 145 Gwanggyo-ro, Yeongtong-gu, Suwon-Si 16229, Gyeonggi-do, Republic of Korea.
Nanomaterials (Basel). 2023 Feb 1;13(3):587. doi: 10.3390/nano13030587.
Phosphates in high concentrations are harmful pollutants for the environment, and new and cheap solutions are currently needed for phosphate removal from polluted liquid media. Iron oxide nanoparticles show a promising capacity for removing phosphates from polluted media and can be easily separated from polluted media under an external magnetic field. However, they have to display a high surface area allowing high removal pollutant capacity while preserving their magnetic properties. In that context, the reproducible synthesis of magnetic iron oxide raspberry-shaped nanostructures (RSNs) by a modified polyol solvothermal method has been optimized, and the conditions to dope the latter with cobalt, zinc, and aluminum to improve the phosphate adsorption have been determined. These RSNs consist of oriented aggregates of iron oxide nanocrystals, providing a very high saturation magnetization and a superparamagnetic behavior that favor colloidal stability. Finally, the adsorption of phosphates as a function of pH, time, and phosphate concentration has been studied. The undoped and especially aluminum-doped RSNs were demonstrated to be very effective phosphate adsorbents, and they can be extracted from the media by applying a magnet.
高浓度磷酸盐是对环境有害的污染物，目前需要新的廉价解决方案来从受污染的液体介质中去除磷酸盐。氧化铁纳米颗粒在从受污染介质中去除磷酸盐方面显示出有前景的能力，并且在外部磁场下可以很容易地从受污染介质中分离出来。然而，它们必须具有高表面积，以便在保持磁性的同时具有高去除污染物的能力。在这种情况下，通过改进的多元醇溶剂热法可重复合成磁性氧化铁覆盆子状纳米结构（RSNs）已得到优化，并且确定了用钴、锌和铝对其进行掺杂以改善磷酸盐吸附的条件。这些RSNs由氧化铁纳米晶体的定向聚集体组成，具有非常高的饱和磁化强度和有利于胶体稳定性的超顺磁行为。最后，研究了磷酸盐吸附与pH、时间和磷酸盐浓度的关系。未掺杂尤其是铝掺杂的RSNs被证明是非常有效的磷酸盐吸附剂，并且可以通过施加磁铁从介质中提取出来。
