Bismuth oxybromide/reduced graphene oxide heterostructure sensitized with Zn-tetracarboxyphthalocyanine as a highly efficient photocatalyst for the degradation of Orange II and phenol

Seydou Ouedraogo (1) , Bilel Chouchene (2) , Thomas Gries (3) , Christophe Desmarets (4) , Lavinia Balan (5) , Jean-Jacques Gaumet (6) , Ghouti Medjahdi (3) , Karifa Bayo (1) , Raphaël Schneider (2)

1 UJZK - Université Joseph Ki-Zerbo [Université de Ouagadougou, Burkina Faso]
2 LRGP - Laboratoire Réactions et Génie des Procédés
3 IJL - Institut Jean Lamour
4 IPCM - Institut Parisien de Chimie Moléculaire
5 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
6 LCP-A2MC - Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes

The preparation of heterostructured photocatalysts associating BiOBr, reduced graphene oxide (rGO) and zinc tetracarboxyphthalocyanine (ZnPc(CO2H)4) and their performance for the degradation of the Orange II dye and of phenol are reported. The BiOBr/rGO/ZnPc(CO2H)4(0.25) photocatalyst displays a superior activity than BiOBr and BiOBr/rGO, indicating that ZnPc(CO2H)4 enhances both the visible light absorption and the charge carrier separation, which is confirmed by photoluminescence, photocurrent responses and electrochemical impedance spectroscopy Nyquist plots. Scavenging experiments show that the main active species involved in the degradation of Orange II and phenol are superoxide radicals and holes and a mechanism is proposed. Due to its high stability, the BiOBr/rGO/ZnPc(CO2H)4(0.25) catalyst shows high potential for real environmental remediation.

Mots clés: Bismuth oxybromide; Reduced graphene oxide; Zinc tetracarboxyphthalocyanine; Heterostructured photocatalyst; Photodegradation

Domaines: Matériaux

Seydou Ouedraogo, Bilel Chouchene, Thomas Gries, Christophe Desmarets, Lavinia Balan, et al.. Bismuth oxybromide/reduced graphene oxide heterostructure sensitized with Zn-tetracarboxyphthalocyanine as a highly efficient photocatalyst for the degradation of Orange II and phenol. Journal of Environmental Chemical Engineering, 2022, 10 (2), pp.107332. ⟨10.1016/j.jece.2022.107332⟩. ⟨hal-03563552⟩