ZnO-Bi2O3/graphitic carbon nitride photocatalytic system with H2O2-assisted enhanced degradation of Indigo carmine under visible light

Indigo carmine in aqueous solution was effectively degraded using ZnO-Bi2O3/Graphitic Carbon Nitride heterojunction structure by visible light/H2O2 system. The mechanism of photocatalytic degradation of Indigo carmine shows the responsible species for the degradation of Indigo carmine in the ZnO-Bi2O3-xC(3)N(4)/H2O2/visible light system (x = 0, 1, 2, and 3) is the hydroxyl radicals which were generated from the reaction of e(-) and h(+) with H2O2. Under optimal conditions, ZnO-Bi2O3-2C(3)N(4)/H2O2/Vis system degraded more than 93% of Indigo carmine in 180 min. Besides, the kinetic of the photocatalytic process was detailed. These results demonstrate that the ZnO-Bi2O3-2C(3)N(4)/H2O2/visible light system may become a promising approach to achieve efficient environmental remediation as an environmentally friendly oxidant. (C) 2019 Production and hosting by Elsevier B.V. on behalf of King Saud University.