磁性Fe3O4@ZrP材料的制备及其对La3+的吸附性能

Preparation of magnetic Fe3O4@ZrP material and the adsorption performance for La3?

摘要:

通过水热法和溶胶-凝胶法制备了磁性磷酸锆复合材料Fe3O4@ZrP。采用SEM、XRD、VSM和FT-IR等对材料进行了表征和分析，并考察了其对矿山尾水中La3+的吸附性能。结果表明，Fe3O4@ZrP具有介孔结构，主要孔径为5 nm，且具有良好超顺磁性，饱和磁化强度为14.18 emu/g；Fe3O4@ZrP对La3+的吸附平衡时间为5 h，在酸性条件下仍具有良好的吸附性；伪一级动力学模型和Langmuir等温吸附模型与试验数据拟合较好，在303 K下饱和吸附容量为169.14 mg/g，此外，热力学参数表明吸附过程是吸热的；La3+通过与材料表面的H+和Na+的离子交换作用以及与-PO基团的配位作用发生吸附；除了三价的Al3+，一价和二价的杂质离子对Fe3O4@ZrP吸附La3+的影响较小；该吸附剂重复利用性能良好，经历5次吸附-解吸循环试验后吸附率仍能到达70%左右。

Abstract:

Magnetic zirconium phosphate composite material Fe3O4@ZrP was prepared via hydrothermal and sol-gel methods. The material was characterized and analyzed using SEM, XRD, VSM, and FT-IR, and its adsorption performance for La3+ in mine tailwater was investigated. The results indicated that Fe3O4@ZrP exhibits a mesoporous structure with a primary pore size of 5 nm and possesses excellent superparamagnetic properties, with a saturation magnetization of 14.18 emu/g. The adsorption equilibrium time of Fe3O4@ZrP for La3? is 5 hours, and the material maintains good adsorption performance under acidic conditions. The pseudo-first-order kinetic model and the Langmuir isotherm model fit the experimental data well, with a saturation adsorption capacity of 169.14 mg/g at 303 K. Additionally, thermodynamic parameters revealed that the adsorption process is endothermic. The adsorption of La3+ occurs through ion exchange with H+ and Na+ on the material surface , as well as coordination with -PO groups. Monovalent and divalent impurity ions, except for trivalent Al3+, have little impact on the adsorption of La3+ by Fe3O4@ZrP. The adsorbent shows good reusability, maintaining an adsorption rate of around 70% after five adsorption-desorption cycles.