Mabuea Busisiwe Petunia, Swart Hendrik Christoffel, Erasmus Elizabeth
Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa.
Department of Chemistry, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa.
ACS Omega. 2022 Jun 24;7(27):23401-23411. doi: 10.1021/acsomega.2c01727. eCollection 2022 Jul 12.
The preparation, characterization, and photocatalytic application of tungsten or molybdenum carbides (Ni-WC, , Co-WC, , Ni-MoC, , Co-MoC, , NiCo-WC, , NiCo-MoC, , NiFe-WC, , and NiFe-MoC, ) doped with transition metals (Fe, Co, and Ni) are reported. These transition-metal carbide (TMC) particles show that the submicrometer globular particles agglomerated to form larger particles, with smaller crystallites present on the surface of the large particles. These crystallite sizes range between 4 and 34 nm (as calculated from X-ray diffraction data) depending on the metal dopant and type of carbide. Oxidation of the metal carbides is evident from the two sets of photoelectron lines present in the X-ray photoelectron spectroscopy (XPS) of the W 4f area. The Mo 3d spectra reveal four sets of photoelectron lines associated with oxidized MoO and MoO as well as Mo and Mo associated with MoC . The XPS of the dopant metals Ni, Co, and Fe also show partial oxidation. The photocatalytic decomposition of Congo red (an azo dye) is used as a model reaction to determine the photocatalytic activities of the transition-metal carbides, which is related to the TMCs' optical band gap energies.
报道了掺杂过渡金属（铁、钴和镍）的碳化钨或碳化钼（Ni-WC、Co-WC、Ni-MoC、Co-MoC、NiCo-WC、NiCo-MoC、NiFe-WC和NiFe-MoC）的制备、表征及光催化应用。这些过渡金属碳化物（TMC）颗粒显示，亚微米级球状颗粒团聚形成较大颗粒，大颗粒表面存在较小的微晶。根据金属掺杂剂和碳化物类型，这些微晶尺寸在4至34纳米之间（由X射线衍射数据计算得出）。从W 4f区域的X射线光电子能谱（XPS）中出现的两组光电子线可以明显看出金属碳化物的氧化。Mo 3d光谱显示与氧化的MoO和MoO以及与MoC相关的Mo和Mo有关的四组光电子线。掺杂金属Ni、Co和Fe的XPS也显示出部分氧化。刚果红（一种偶氮染料）的光催化分解用作模型反应，以确定过渡金属碳化物的光催化活性，这与TMCs的光学带隙能量有关。
