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研究报告

Preparation of magnetic microalgae complex and its adsorption capacity for uranium

摘要：通过水热法对冷冻干燥得到的雨生红球藻粉（PRCP）进行改性，合成了磁性γ-Fe₂O₃/PRCP，并采用X-射线衍射仪（XRD）、扫描电镜（SEM）、傅里叶变换红外光谱仪（FT-IR）、X-射线光电子能谱（XPS）、X射线能谱分析（EDS）、BET等方法对材料的形貌和结构进行了表征，通过静态吸附实验分别探究了不同pH值、初始铀浓度、温度、时间等对铀酰离子吸附性能的影响.结果表明，在初始pH=6时，材料对铀的吸附效果最好.从吸附动力学看，吸附过程更符合准二级动力学模型.通过对材料进行热力学模型拟合发现，在25 ℃、pH=6时材料吸附过程更符合Langmuir方程，且随着溶液中初始铀酰离子浓度的升高，材料表现出了更好的吸附效果.

Abstract：The magnetic γ-Fe₂O₃/PRCP （Pluvial red chlorella powder） was synthesized by modifying PRCP obtained by freeze-drying by hydrothermal method. The morphology and structure of the materials were characterized by X-ray diffractometry （XRD）， scanning electron microscopy （SEM）， Fourier transform infrared spectrometer （FT-IR）， X-ray photoelectron spectroscopy （XPS）， X-ray energy spectroscopy （EDS）， BET， and other methods. The effects of pH value， initial uranium concentration， temperature， and time on the adsorption properties of uranyl ions were studied by static adsorption experiments. The experimental results demonstrate that when the initial pH value is 6， the material has the best uranium adsorption effect. In terms of adsorption kinetics， the adsorption process is more consistent with the quasi-second-order kinetic model. The thermodynamic model fitting of the material shows that the adsorption process of the material is more in line with the Langmuir equation at 25 °C， pH = 6， and the adsorption effect improves with increasing the initial concentration of uranyl ion.