催化剂Cu/PC-GO的制备及对4-NP的催化性能研究

Preparation of Cu/PC-GO catalyst and its catalytic properties for 4-NP reduction

开发具有良好催化还原活性的非贵金属催化剂用于对硝基苯酚(4-NP)的高效快速还原是目前研究的重点。以HKUST-1为牺牲模板剂,通过原位掺杂氧化石墨烯的方法成功地制备出多孔高活性的金属纳米复合材料Cu/PC-GO,并将其用于对硝基苯酚的高效快速还原。采用XRD、SEM、ASAP等手段对催化剂进行表征分析。结果表明,Cu/PC-GO复合催化剂具有活性组分丰富(Cu/CuO/Cu2O),较大的比表面积(113.6 m^2/g)和孔体积(0.253 cm^3/g),以及较高的表面Cu含量(5.88%)等特征。研究发现,室温条件下,Cu/PC-GO可以实现对对硝基苯酚的快速完全还原,其反应速率是原始材料Cu/PC的17.5倍,而且其活化能也显著降低,由掺杂前的122.22 kJ/mol降至掺杂后的61.9 kJ/mol。可见,以HKUST-GO为前驱体,可以获得具有高催化活性的Cu/PC-GO复合催化剂,其在4-NP的还原过程中展示出良好的催化还原性能。

The development of a non-noble metal catalyst with good catalytic activity for the efficient and rapid reduction of 4-nitrophenol(4-NP)is the focus of current research.In this work,the porous and highly active metal nanocomposite Cu/PC-GO was successfully prepared by in situ doping GO with HKUST-1 as the sacrificial template,and was used for the efficient and rapid reduction of 4-nitrophenol.The catalysts were characterized by XRD,SEM,and ASAP.The results revealed that Cu/PC-GO catalysts possessed richer active components(Cu/CuO/Cu2O),larger specific surface area(113.6 m^2/g)and pore volume(0.253 cm^3/g),and higher Cu content(5.88%)on the surface.It was found that Cu/PC-GO could achieve 4-NP reduction rapidly and completely,and the reaction rate was 17.46 times higher than that of bare Cu/PC catalyst at room temperature.Meanwhile,its activation energy decreased significantly from 122.22 to 61.9 kJ/mol after GO doping.It was concluded that Cu/PC-GO with higher catalytic activity obtained by carbonizing HKUST-GO showed better catalytic reduction performance for 4-NP reduction.