Photocatalytic activities of coke carbon/g-C(3)N(4) and Bi metal/Bi mixed oxides/g-C(3)N(4) nanohybrids for the degradation of pollutants in wastewater

Different g-C(3)N(4) composite systems (coke carbon/g-C(3)N(4), Bi/Bi(2)WO(6)/g-C(3)N(4) and Bi/Bi(2)MoO(6)/g-C(3)N(4)) have been assessed as photocatalysts for wastewater pollutants removal. The coke carbon/g-C(3)N(4) hybrid, produced by thermal treatment at 550 °C of a composite made from melamine cyanurate and coke, only showed activity under UV-light irradiation. On the other hand, inorganic Bi spheres/Bi mixed oxides/g-C(3)N(4) nanohybrids (Bi/Bi(2)WO(6)/g-C(3)N(4) and Bi/Bi(2)MoO(6)/g-C(3)N(4) composites), produced by thermal reduction of Bi(2)WO(6) or Bi(2)MoO(6) by g-C(3)N(4), exhibited a remarkable red-shift, up to 620 nm, and allowed the visible-light driven degradation of the contaminant, albeit in combination with some adsorption.