Biswas Bristy, Rahman Md Lutfor, Ahmed Md Farid, Sharmin Nahid
Institute of Glass and Ceramic Research and Testing (IGCRT), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhanmondi, Dhaka, 1205, Bangladesh.
Heliyon. 2024 May 9;10(10):e30810. doi: 10.1016/j.heliyon.2024.e30810. eCollection 2024 May 30.
In this work, the transformation of waste iron cans to gamma iron oxide (γ-FeO) nanoparticles following acid leaching precipitation method along with their structural, surface chemistry, and magnetic properties was studied. Highly magnetic iron-based nanomaterials, maghemite with high saturation magnetization have been synthesized through an acid leaching technique by carefully tuning of pH and calcination temperature. The phase composition and crystal structure, surface morphology, surface chemistry, and surface composition of the synthesized γ-FeO nanoparticles were explored by X-ray diffraction (XRD), Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Energy-dispersive X-ray spectroscopy (EDS). The XRD results confirm the cubic spinel structure having crystallite size 26.90-52.15 nm. The XPS study reveals the presence of Fe, O element and the binding energy of Fe (710.31 and 724.48 eV) confirms the formation of γ-FeO as well. By dynamic light scattering (DLS) method and zeta potential analyzer, the particle size distribution and stability of the systems were investigated. The magnetic behavior of the synthesized γ-FeO nanoparticles were studied using a vibrating sample magnetometer (VSM) which confirmed the ferrimagnetic particles with saturation magnetization of 54.94 emu/g. The resultant maghemite nanoparticles will be used in photocatalysts and humidity sensing. The net impact of the work stated here is based on the principle of converting waste into useful nanomaterials. Finally, it was concluded that our results can give insights into the design of the synthesis procedure from the precursor to the high-quality gamma iron oxide nanoparticles with high saturation magnetization for different potential applications which are inexpensive and very simple.
在本研究中，采用酸浸沉淀法将废铁罐转化为γ-氧化铁（γ-Fe₂O₃）纳米颗粒，并对其结构、表面化学性质和磁性进行了研究。通过精心调节pH值和煅烧温度，利用酸浸技术合成了具有高饱和磁化强度的高磁性铁基纳米材料——磁赤铁矿。通过X射线衍射（XRD）、扫描电子显微镜（SEM）、X射线光电子能谱（XPS）和能量色散X射线光谱（EDS）对合成的γ-Fe₂O₃纳米颗粒的相组成和晶体结构、表面形貌、表面化学性质及表面组成进行了探究。XRD结果证实其具有立方尖晶石结构，晶粒尺寸为26.90 - 52.15 nm。XPS研究表明存在Fe、O元素，Fe的结合能（710.31和724.48 eV）也证实了γ-Fe₂O₃的形成。通过动态光散射（DLS）法和zeta电位分析仪研究了体系的粒径分布和稳定性。使用振动样品磁强计（VSM）研究了合成的γ-Fe₂O₃纳米颗粒的磁行为，证实其为亚铁磁性颗粒，饱和磁化强度为54.94 emu/g。所得磁赤铁矿纳米颗粒将用于光催化剂和湿度传感。此处所述工作的总体影响基于将废物转化为有用纳米材料的原理。最后得出结论，我们的结果可为从前驱体到具有高饱和磁化强度的高质量γ-氧化铁纳米颗粒的合成程序设计提供见解，以用于不同的潜在应用，该合成方法廉价且非常简单。
