Akl Zeinab F
Egyptian Atomic Energy Authority P.O. Box 11762 Cairo Egypt
RSC Adv. 2021 Dec 8;11(62):39233-39244. doi: 10.1039/d1ra04515f. eCollection 2021 Dec 6.
In this study, novel Cyanex-923-coated magnetite nanoparticles (FeO@Cyanex-923) were prepared, comprehensively characterized, and employed for uranium(vi) ion adsorption from aqueous solutions. FTIR and TGA data confirmed that FeO has successfully gained Cyanex-923 surface functionality. Particle size and morphological studies DLS, HR-TEM, and SEM showed uniform-dispersed quasi-spherical nanoparticles with a mean diameter of 44 nm. Magnetism measurement data revealed the superparamagnetic properties of the FeO@Cyanex-923 nanoadsorbent. The effect of different experimental settings on the adsorption efficiency was studied to determine the best operational conditions. The experimental results were analyzed using Langmuir, Freundlich, and Temkin isotherms; where the adsorption data obeyed the Langmuir model showing a theoretical adsorption capacity of 429.185 mg g at 298 K. Kinetics data analysis revealed a fast adsorption process that could reach equilibrium within 60 min and is well-fitted to the pseudo-2nd-order model. Temperature affected the adsorption process and the thermodynamic data indicated that uranium(vi) adsorption was spontaneous and exothermic. FeO@Cyanex-923 nanoparticles displayed a good regeneration behavior over three sequential adsorption-desorption cycles. The FeO@Cyanex-923 nanoadsorbent showed a high uranium adsorption capacity, fast equilibration time, economic nature, good reusability, and easy separation; making it a promising candidate for uranium(vi) removal from nuclear waste streams.
在本研究中，制备了新型的Cyanex - 923包覆磁铁矿纳米颗粒（FeO@Cyanex - 923），对其进行了全面表征，并用于从水溶液中吸附铀（VI）离子。傅里叶变换红外光谱（FTIR）和热重分析（TGA）数据证实FeO已成功获得Cyanex - 923表面官能团。粒度和形态学研究（动态光散射（DLS）、高分辨率透射电子显微镜（HR - TEM）和扫描电子显微镜（SEM））显示出平均直径为44 nm的均匀分散的准球形纳米颗粒。磁性测量数据揭示了FeO@Cyanex - 923纳米吸附剂的超顺磁性。研究了不同实验条件对吸附效率的影响，以确定最佳操作条件。使用朗缪尔（Langmuir）、弗伦德利希（Freundlich）和坦金（Temkin）等温线对实验结果进行了分析；其中吸附数据符合朗缪尔模型，在298 K时理论吸附容量为429.185 mg/g。动力学数据分析表明吸附过程快速，可在60分钟内达到平衡，并且与准二级模型拟合良好。温度影响吸附过程，热力学数据表明铀（VI）吸附是自发的且放热的。FeO@Cyanex - 923纳米颗粒在三个连续的吸附 - 解吸循环中表现出良好的再生性能。FeO@Cyanex - 923纳米吸附剂显示出高铀吸附容量、快速平衡时间、经济性、良好的可重复使用性和易于分离；使其成为从核废物流中去除铀（VI）的有前景的候选材料。
