Abstract In the present work, Cu2+ substituted Co ferrite (CuxCo1-xFe2O4, x = 0.00, 0.25, 0.50, 0.75 and 1.00) nanoparticles embedded in SiO2 matrix were synthesized via a modified sol-gel method followed by high temperature annealing. The reaction progress was investigated by thermal analysis coupled with mass spectrometry and Fourier transformed infrared spectroscopy (FT-IR), while the formation of CuxCo1-xFe2O4/SiO2 nanocomposites (NCs) and of secondary phases as a result of the variation of Cu/Co molar ratios were investigated by powder X-ray diffraction analysis (PXRD) and FT-IR. The particle size and shape were studied by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). By varying the Cu/Co molar ratios, the dependence of phase specific parameters (crystallite size, cell parameter, density, porosity) and the evolution of particle shape and size at 1000 °C were investigated by TEM. The photocatalytic activity of the NCs by increasing the Cu content was evaluated through the degradation of Rhodamine B under UV-Vis light irradiation.

中文翻译：

---

研究嵌入 SiO2 基质中的 CuxCo1-xFe2O4 (0 ≤ x ≤ 1) 纳米粒子的热、结构、形态和光催化性能

摘要 在目前的工作中，Cu2+ 取代的 Co 铁氧体（CuxCo1-xFe2O4，x = 0.00、0.25、0.50、0.75 和 1.00）纳米颗粒嵌入 SiO2 基体中，通过改进的溶胶-凝胶方法合成，然后高温退火。通过热分析结合质谱和傅里叶变换红外光谱 (FT-IR) 研究了反应进程，而 CuxCo1-xFe2O4/SiO2 纳米复合材料 (NCs) 和二次相的形成是由于 Cu/Co 的变化通过粉末X射线衍射分析(PXRD)和FT-IR研究摩尔比。通过透射电子显微镜（TEM）和扫描电子显微镜（SEM）研究粒径和形状。通过改变 Cu/Co 摩尔比，相特定参数（微晶尺寸、晶胞参数、密度、孔隙率）和颗粒形状和尺寸在 1000 °C 下的演变通过 TEM 进行了研究。通过在 UV-Vis 光照射下降解罗丹明 B 来评估通过增加 Cu 含量来评估 NCs 的光催化活性。