stoichiometric ratio. The catalytic efficiency of the synthesized ferrite samples was explored for the reduction of nitrophenols. Cu substituted cobalt ferrite nanoparticles (CoCu0.2Fe1.8O4) possessed excellent catalytic activity while CoM0.2Fe1.8O4 (M = Co, Ni and Zn) were inactive for the same. The substrate scope of the developed protocol was also evaluated for the reduction of various CH3-, NH2-,
使用溶胶-凝胶法制备了过渡
金属掺杂的
钴铁氧体(CoM 0.2 Fe 1.8 O 4(M = Co,Ni,Cu,Zn))纳米粒子。将获得的
铁氧体纳米粒子在400°C下进行退火,并使用傅里叶变换红外光谱(FT-IR),X射线衍射(XRD),高分辨率透射电子显微镜(HR-
TEM),振动样品磁法(VSM)进行表征能量色散X射线(EDX)和扫描透射电子显微镜(S
TEM)。在FT-IR光谱中,观察到1000-400 cm -1范围内的两个谱带,对应于四面体和八面体位置的M-O键。XRD图谱证实形成了具有Fd m的立方尖晶石结构空间群。HR-
TEM分析显示,所有合成的
铁氧体纳米粒子的粒度均为20–30 nm,为准球形。从HR-
TEM获得的分别对应于(2 2 0),(3 1 1),(4 0 0)和(5 1 1)晶格的晶格晶面间距为0.29、0.25、0.21和0.16nm。与XRD数据完全一致。EDX-S