TY - JOUR
T1 - Novel visible light induced Co3O4-g-C3N4 heterojunction photocatalysts for efficient degradation of methyl orange
AU - Han, Changcun
AU - Ge, Lei
AU - Chen, Changfeng
AU - Li, Yujing
AU - Xiao, Xinlai
AU - Zhang, Yuanna
AU - Guo, Lele
PY - 2014/4/5
Y1 - 2014/4/5
N2 - 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 0.2wt%. 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 (O2-), 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.
AB - 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 0.2wt%. 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 (O2-), 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.
KW - Cobalt oxides
KW - Graphitic carbon nitride
KW - Heterojunction photocatalysts
KW - Photocatalysis
UR - http://www.scopus.com/inward/record.url?scp=84886708344&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2013.09.038
DO - 10.1016/j.apcatb.2013.09.038
M3 - Article
AN - SCOPUS:84886708344
SN - 0926-3373
VL - 147
SP - 546
EP - 553
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -