A solid solution of aero-gel based cerium doped iron oxide nanoparticles has been utilized for the first time for ultrasonic wave assisted adsorptive removal of arsenic from aqueous medium. The FE-SEM and HR-TEM images revealed a novel morphology of hollow architectures with irregular distribution in sizes in which the particles are interconnected with each other in a long-range network. The HR-XRD analysis indicated the cubic fluorite type structure with Fm3̅m space group which is retained even after adsorption of As(III). The Raman study and Lebail refinement confirmed the formation of solid solution of Fe and Ce oxide nanoparticles. The room temperature ferromagnetism was observed for CeO₂ NPs (Ms 0.0209 emu g^–1) which is attributed to higher concentration of oxygen vacancies and increased (Ms 0.0287 emu g^–1) after doping of iron. The adsorption pattern of As(III) is well-defined by Redlich–Peterson isotherm while the adsorption is governed by pseudo-second-order kinetics. The HR-XPS and diffuse reflectance spectroscopy revealed the formation of variable oxidation state of metal ions which facilitate the oxidation of As(III) (more toxic) to As(V) (less toxic) during adsorption process. The effective removal of arsenic (more than 80%) was observed within 2.5 min of initial adsorption process and approximately 99% removal was achieved within 10 min of adsorption. The adsorption capacity of our best adsorbent was found to be 263 mg g^–1. The effect of pH and interfering ions on adsorption capacities of synthesized adsorbents revealed its efficacy over the wide range of pH.

中文翻译：

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基于Aero-Gel的铈掺杂氧化铁固溶体，用于超快去除砷

气凝胶基铈掺杂的氧化铁纳米颗粒的固溶体已首次用于超声波辅助从水性介质中吸附去除砷。FE-SEM和HR-TEM图像揭示了一种新型的中空结构形态，其大小不规则分布，其中粒子在远程网络中相互连接。的HR-XRD分析表明与立方萤石型结构的FM 3米，其甚至作为（III）的吸附后保留空间群。拉曼研究和Lebail精炼证实了Fe和Ce氧化物纳米颗粒的固溶体的形成。CeO ₂ NPs（Ms 0.0209 emu g ^–1），这归因于氧空位浓度的增加和铁掺杂后的增加（Ms 0.0287 emu g ^–1）。通过Redlich-Peterson等温线可以很好地定义As（III）的吸附模式，而吸附则由拟二级动力学控制。HR-XPS和漫反射光谱法揭示了金属离子的可变氧化态的形成，这有助于在吸附过程中将As（III）（毒性更高）氧化为As（V）（毒性更低）。在初始吸附过程的2.5分钟内观察到了有效去除砷（大于80％）的情况，在10分钟内达到了约99％的去除率。发现我们最好的吸附剂的吸附容量为263 mg g ^–1。pH和干扰离子对合成吸附剂吸附容量的影响显示了其在宽pH范围内的功效。