Abstract In this study, spinel magnesium cobalt ferrite (Co x Mg 1−x Fe 2 O 4 : x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) nanocomposites were synthesized successfully by modified sol-gel combustion method. Magnesium nitrate, cobalt nitrate and iron nitrate were used as the source of divalent (Mg 2+ and Co 2+ ) and trivalent (Fe 3+ ) cations, respectively and urea were used as the reducing (fuel) agent. The effects of cobalt ions on morphology, structural, optical, magnetic and photo-catalytic properties of spinel Co x Mg 1−x Fe 2 O 4 nanocomposites were investigated. Various characterization methods, including X-ray powder diffraction (XRD), high resolution scanning electron microscope (HR-SEM), transmission electron microscopy (HR-TEM), energy-dispersive X-ray spectroscopy (EDX), Fourier transforms infrared (FT-IR) spectroscopy, vibrating sample magnetometer (VSM) and photo-catalytic degradation (PCD) activity were used to study the phase purity, microstructure, particle size, elemental composition, functional group determination, band gap calculation, magnetic properties and degradation efficiency of nanoparticles, respectively. The observed results showed that the final products consists cubic spinel phase with sphere-like nanoparticles morphologies. Furthermore, spinel Co 0.6 Mg 0.4 Fe 2 O 4 nanocomposite showed highest PCD efficiency (98.55%) than other composition of ferrite nanoparticles.

中文翻译：

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过渡金属钴（Co 2+ 离子）掺杂尖晶石MgFe 2 O 4 铁氧体纳米复合材料的增强磁光和光催化性能

摘要 本研究采用改进的溶胶-凝胶燃烧法成功合成了尖晶石镁钴铁氧体（Co x Mg 1−x Fe 2 O 4 : x = 0.0、0.2、0.4、0.6、0.8和1.0）纳米复合材料。硝酸镁、硝酸钴和硝酸铁分别用作二价（Mg 2+ 和Co 2+ ）和三价（Fe 3+ ）阳离子的来源，尿素用作还原（燃料）剂。研究了钴离子对尖晶石 Co x Mg 1-x Fe 2 O 4 纳米复合材料的形貌、结构、光学、磁性和光催化性能的影响。各种表征方法，包括 X 射线粉末衍射 (XRD)、高分辨率扫描电子显微镜 (HR-SEM)、透射电子显微镜 (HR-TEM)、能量色散 X 射线光谱 (EDX)、傅里叶变换红外 (FT -IR) 光谱，采用振动样品磁强计（VSM）和光催化降解（PCD）活性分别研究纳米颗粒的相纯度、微观结构、粒径、元素组成、官能团测定、带隙计算、磁性和降解效率。观察结果表明，最终产品由立方尖晶石相组成，具有球形纳米颗粒形态。此外，尖晶石Co 0.6 Mg 0.4 Fe 2 O 4 纳米复合材料比其他铁氧体纳米复合材料表现出最高的PCD效率（98.55%）。观察结果表明最终产品由立方尖晶石相组成，具有球形纳米颗粒形态。此外，尖晶石Co 0.6 Mg 0.4 Fe 2 O 4 纳米复合材料比其他铁氧体纳米复合材料表现出最高的PCD效率（98.55%）。观察结果表明，最终产品由立方尖晶石相组成，具有球形纳米颗粒形态。此外，尖晶石Co 0.6 Mg 0.4 Fe 2 O 4 纳米复合材料比其他铁氧体纳米复合材料表现出最高的PCD效率（98.55%）。