Key Laboratory of Automobile Materials (Jilin University), Ministry of Education and School of Materials Science and Engineering, Jilin University, Changchun 130022, China.
J Hazard Mater. 2011 Nov 30;196:342-9. doi: 10.1016/j.jhazmat.2011.09.032. Epub 2011 Sep 16.
This investigation was to increase the adsorption capacity of magnetite for Congo red (CR) by adulterating a small quantity of La(3+) ions into it. The adsorption capability of nanocrystalline Fe(3-x)La(x)O(4) (x=0, 0.01, 0.05, 0.10) ferrite to remove CR from aqueous solution was evaluated carefully. Compared with undoped magnetite, the adsorption values were increased from 37.4 to 79.1 mg g(-1). The experimental results prove that it is effectual to increase the adsorption capacity of magnetite by doped La(3+) ions. Among the La(3+)-doped magnetite, Fe(2.95)La(0.05)O(4) nanoparticles exhibit the highest saturation magnetization and the maximum adsorption capability. The desorption ability of La(3+)-doped magnetite nanoparticles loaded by CR can reach 92% after the treatment of acetone. Furthermore, the Fe(3-x)La(x)O(4) nanoparticles exhibited a clearly ferromagnetic behavior under applied magnetic field, which allowed their high-efficient magnetic separation from wastewater. It is found that high magnetism facilitates to improve their adsorption capacity for the similar products.
本研究通过掺杂少量 La(3+) 离子来提高磁铁矿对刚果红 (CR) 的吸附能力。详细评估了纳米晶 Fe(3-x)La(x)O(4)（x=0、0.01、0.05、0.10）铁氧体去除水溶液中 CR 的吸附能力。与未掺杂的磁铁矿相比，吸附值从 37.4 增加到 79.1 mg g(-1)。实验结果证明，掺杂 La(3+) 离子可以有效提高磁铁矿的吸附能力。在 La(3+)-掺杂的磁铁矿中，Fe(2.95)La(0.05)O(4)纳米颗粒表现出最高的饱和磁化强度和最大的吸附能力。负载 CR 的 La(3+)-掺杂磁铁矿纳米颗粒经丙酮处理后解吸率可达 92%。此外，Fe(3-x)La(x)O(4)纳米颗粒在施加磁场下表现出明显的铁磁性，这使得它们能够从废水中高效地进行磁性分离。研究发现，高磁性有助于提高其对类似产品的吸附能力。
