Wang Zhi, Shi Changmin, Li Pengfei, Wang Wenzhu, Xiao Wenzhen, Sun Ting, Zhang Jing
School of Physics and Electrical Engineering, Anyang Normal University, Anyang 455000, China.
School of Physics and Electronic Engineering, Linyi University, Linyi 276000, China.
Molecules. 2023 Jul 28;28(15):5730. doi: 10.3390/molecules28155730.
B-site cobalt (Co)-doped rare-earth orthoferrites ReFeO have shown considerable enhancement in physical properties compared to their parent counterparts, and Co-doped LuFeO has rarely been reported. In this work, LuFeCoO (x = 0, 0.05, 0.1, 0.15) powders have been successfully prepared by a mechanochemical activation-assisted solid-state reaction (MAS) method at 1100 °C for 2 h. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy studies demonstrated that a shrinkage in lattice parameters emerges when B-site Fe ions are substituted by Co ions. The morphology and elemental distribution were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The UV-visible absorbance spectra show that LuFeCoO powders have a narrower bandgap (1.75 eV) and higher absorbance than those of LuFeO (2.06 eV), obviously improving the light utilization efficiency. Additionally, LuFeCoO powders represent a higher photocatalytic capacity than LuFeO powders and can almost completely degrade MO in 5.5 h with the assistance of oxalic acid under visible irradiation. We believe that the present study will promote the application of orthorhombic LuFeO in photocatalysis.
与母体相比，B 位钴（Co）掺杂的稀土正铁氧体 ReFeO 在物理性能方面有显著增强，而 Co 掺杂的 LuFeO 鲜有报道。在本工作中，通过机械化学活化辅助固态反应（MAS）法于 1100℃下反应 2 小时，成功制备了 LuFeCoO（x = 0、0.05、0.1、0.15）粉末。X 射线衍射（XRD）和傅里叶变换红外（FTIR）光谱研究表明，当 B 位 Fe 离子被 Co 离子取代时，晶格参数会出现收缩。通过扫描电子显微镜（SEM）和能量色散光谱（EDS）研究了其形貌和元素分布。紫外可见吸收光谱表明，LuFeCoO 粉末的带隙（1.75 eV）比 LuFeO（2.06 eV）更窄，吸光度更高，明显提高了光利用效率。此外，LuFeCoO 粉末比 LuFeO 粉末具有更高的光催化能力，在可见光照射下，借助草酸可在 5.5 小时内几乎完全降解甲基橙（MO）。我们相信，本研究将促进正交相 LuFeO 在光催化中的应用。
