超临界CO_2制备h-BN纳米片及其负载钴催化性能研究

Exfoliation of BNNSs by supercritical CO_2 and potential application of Co/BNNSs in catalysis

利用超临界二氧化碳(SC CO_2)技术剥离块状h-BN,制备氮化硼纳米片(BNNSs),并将钴纳米粒子负载在BNNSs上,得到催化剂Co/BNNSs,并通过XRD、FT-IR和SEM对两者的结构和形貌进行表征。以对硝基苯酚的催化还原反应为模型考察催化剂的催化性能,经过5次循环后,还原活性无明显降低,对硝基苯酚的还原率仍在80%以上。因此,Co/BNNSs催化剂具有良好的稳定性和催化还原对硝基苯酚的性能。

Co/BNNSs catalyst is obtained by loading cobalt nanoparticles on hexagonal boron nitride nanosheets（BNNSs） that are prepared through the exfoliation of bulk hexagonal boron nitride（h-BN） in supercritical CO2. The morphologies and structures of BNNSs and Co/BNNSs are characterized by X-ray Diffraction（XRD）,Fourier Transform Infrared Spectroscopy（FT-IR） and Scanning Electron Microscope（SEM）. Moreover,the catalytic activities of Co/BNNSs are investigated in reducing p-nitrophenol to p-aminophenol.The result illustrates that the reduction activity of the catalyst does not decrease significantly after five cycles and the reduction rate remains still over 80%. It is verified that Co/BNNSs have a good stability and can keep excellent catalytic activities in the reduction of p-nitrophenol.