Novel visible light induced Co3O4-g-C3N4 heterojunction photocatalysts for efficient degradation of methyl orange

作者：Han, Changcun; Ge, Lei^*; Chen, Changfeng; Li, Yujing; Xiao, Xinlai; Zhang, Yuanna; Guo, Lele

来源：Applied Catalysis B: Environmental , 2014, 147: 546-553.

DOI：10.1016/j.apcatb.2013.09.038

• Graphitic carbon nitride
• Cobalt oxides
• Photocatalysis
• Heterojunction photocatalysts

Novel visible-light-induced Co3O4-g-C3N4 heterojunction photocatalysts were synthesized via a facile mixing-and-heating method. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), ultraviolet-visible diffuse reflection spectroscopy (DRS), electron spin resonance (ESR) and photoluminescence spectroscopy (PL). The heterojunction photocatalysts exhibit a significantly enhanced photocatalytic activity in degrading methyl orange (MO). The optimal Co3O4 content with the highest photocatalytic activity was determined to be 0.2 wt%. The synergetic effect between Co3O4 and g-C3N4 plays an important role in promoting photo-generated carrier separation. The ESR and PL results reveals that the enhanced photocatalytic activity of Co3O4-g-C3N4 was mainly due to the superior amount and longer lifetime of oxidative radicals (O-.(2)-), as well as the efficient separation of charge carriers. Possible mechanism is proposed for the high photocatalytic activity of heterojunction structures, to guide the design of photocatalysts.

• 出版日期2014-4-5
• 单位中国石油大学（北京）