Photocatalytic activities of coke carbon/g-C3N4 and Bi metal/Bi mixed oxides/g-C3N4 nanohybrids for the degradation of pollutants in wastewater

Marta Sierra; Emma Borges; Pedro Esparza; Jorge Méndez-Ramos; Jesús Martín-Gil; Pablo Martín-Ramos

doi:10.1080/14686996.2016.1235962

Photocatalytic activities of coke carbon/g-C₃N₄ and Bi metal/Bi mixed oxides/g-C₃N₄ nanohybrids for the degradation of pollutants in wastewater

Sci Technol Adv Mater. 2016 Oct 12;17(1):659-668. doi: 10.1080/14686996.2016.1235962. eCollection 2016.

Authors

Marta Sierra¹, Emma Borges¹, Pedro Esparza², Jorge Méndez-Ramos³, Jesús Martín-Gil⁴, Pablo Martín-Ramos⁵

Affiliations

¹ Chemical Engineering Department, University of La Laguna , Santa Cruz de Tenerife , Spain.
² Chemical Department, University of La Laguna , Santa Cruz de Tenerife , Spain.
³ Physics Department, University of La Laguna , Santa Cruz de Tenerife , Spain.
⁴ Advanced Materials Laboratory, ETSIIAA, University of Valladolid , Palencia , Spain.
⁵ EPSH, University of Zaragoza , Huesca , Spain.

Abstract

Different g-C₃N₄ composite systems (coke carbon/g-C₃N₄, Bi/Bi₂WO₆/g-C₃N₄ and Bi/Bi₂MoO₆/g-C₃N₄) have been assessed as photocatalysts for wastewater pollutants removal. The coke carbon/g-C₃N₄ 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-C₃N₄ nanohybrids (Bi/Bi₂WO₆/g-C₃N₄ and Bi/Bi₂MoO₆/g-C₃N₄ composites), produced by thermal reduction of Bi₂WO₆ or Bi₂MoO₆ by g-C₃N₄, 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.

Keywords: 104 Carbon and related materials; 205 Catalyst / Photocatalyst / Photosynthesis; 60 New topics/Others; Carbon nitride; bismuth mixed oxides; coke; photocatalysis; wastewater pollutants.