Perovskite-type ferromagnetic BiFeO3 nanopowder was readily synthesized via thermal decomposition of Bi[Fe(CN)6]·5H2O complex and characterized using thermal analysis (TGA/DSC), X-ray diffraction (XRD), Fourier-transformed infrared spectroscopy (FT–IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), magnetic measurement and Brunauer–Emmett–Teller (BET) specific surface area measurements. The magnetic measurements show a ferromagnetic behavior for the BiFeO3 nanoparticles at room temperature. This nanosized ferromagnetic oxide with an average particle size of approximately 20 nm and a specific surface area of 48.5 m2/g was used as a new magnetically recoverable heterogeneous nanocatalyst for the highly efficient and selective reduction of aromatic nitro compounds into their corresponding amines by using propan-2-ol as the hydrogen donor under microwave irradiation. This method is regio- and chemoselective, clean, inexpensive and compatible with the substrates having hydrogenlyzable or reducible functional groups. As compared with conventional heating, this method is very fast and suitable for the large-scale preparation of different substituted anilines as well as other arylamines. The catalyst can also be reused without loss of activity.
钙钛矿型
铁磁性BiFeO3纳米粉末通过Bi[Fe(CN)6]·5H2O配合物的热分解容易地合成,并使用热分析(TGA/
DSC)、X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜(
SEM)、透射电子显微镜(
TEM)、能量色散X射线谱(EDX)、磁性测量及BET比表面积测量进行表征。磁性测量显示,BiFeO3纳米颗粒在室温下表现出
铁磁性行为。这种具有约20 nm平均粒径和48.5 m²/g比表面积的纳米级
铁磁性氧化物被用作一种新的磁性可回收异质纳米催化剂,用于在微波辐射下使用丙-2-醇作为氢供体,对芳香
硝基化合物进行高效且选择性的还原为相应的胺。该方法具有区域和
化学选择性,干净、成本低廉,并与具有可氢化或可还原官能团底物相兼容。与常规加热相比,这种方法非常快速,适合大规模制备不同取代的
苯胺以及其他芳香胺。催化剂也可重复使用而不会损失活性。