The present work reports the successful coating of FeO nanospheres with oleylamine utilizing a single-step solvothermal technique and its application to carbon dioxide's capture and chemical fixation. The existence of the pure cubic spinel phase of FeO was established by X-ray diffraction. Fourier transform infrared spectroscopy revealed vibrations corresponding to the oleylamine structure, affirming the coating of oleylamine on FeO nanospheres. X-ray photoelectron spectroscopy further confirmed the presence of oleylamine on the FeO surface, along with the constituent elements Fe and O. The nanospheres exhibited a spherical shape with an average diameter of ∼17 nm, shown by morphological investigations. Magnetic properties exhibited a Verwey transition at ∼114 K and a saturation magnetization of ∼60 emu/g. The surface area measurements revealed a pore volume of 0.0717 ccg and surface area of 30.558 mg. The existence of oleylamine on the surface of FeO nanospheres facilitated the capture of CO through chemisorption due to the amine group's high selectivity and the nanospheres' large surface area. In the presence of styrene oxide and tetra-n-hexyl ammonium bromide (THAB), the oleylamine-coated FeO nanospheres successfully converted CO to styrene carbonate. The magnetic core and high thermal stability of the material make it suitable for recyclability for the fixation of CO into products with added value. This work presents a promising approach for CO capture and utilization using FeO nanospheres coated with oleylamine, with potential applications in carbon capture and utilization technologies.

中文翻译：

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油胺包覆介孔 Fe3O4 纳米球的合成及其在二氧化碳高效化学固定方面的应用

目前的工作报告了利用一步溶剂热技术成功用油胺涂覆 Fe3O 纳米球及其在二氧化碳捕获和化学固定中的应用。通过 X 射线衍射证实了 Fe3O 纯立方尖晶石相的存在。傅里叶变换红外光谱揭示了与油胺结构相对应的振动，证实了油胺在 Fe3O 纳米球上的涂层。 X射线光电子能谱进一步证实了Fe3O表面存在油胺以及组成元素Fe和O。形态学研究表明，纳米球呈球形，平均直径约为17 nm。磁性在~114 K 处表现出 Verwey 转变，饱和磁化强度为~60 emu/g。表面积测量显示孔体积为0.0717ccg，表面积为30.558mg。由于胺基的高选择性和纳米球的大表面积，Fe3O纳米球表面存在油胺，有利于通过化学吸附捕获CO。在氧化苯乙烯和四正己基溴化铵 (THAB) 存在下，油胺包覆的 Fe3O 纳米球成功地将 CO 转化为碳酸苯乙烯。该材料的磁芯和高热稳定性使其适合回收利用，将二氧化碳固定成具有附加值的产品。这项工作提出了一种利用油胺涂覆的 Fe3O 纳米球捕获和利用 CO 的有前景的方法，在碳捕获和利用技术中具有潜在的应用。