A novel Z-scheme oxygen-doped g-C3N4 nanosheet/NaBiS2 nanoribbon for efficient photocatalytic H2O2 production and organic pollutants degradation

The paper reports a “green” method for hydrogen peroxide (H 2 O 2 ) production and organic pollutants removal to solve the related environmental exacerbation. Herein, a novel two-dimensional (2D) nanocomposite of oxygen-doped graphitic carbon nitride nanosheets with sodium bismuth sulfide nanoribbons was prepared through hydrothermal treatment. Z-scheme-based charge-transfer dynamics could remarkably boost the spatial charge separation to promote the activation of molecular oxygen for H 2 O 2 production and organic dyes degradation. As prepared, binary nanocomposite exhibited an ultra-high H 2 O 2 production rate of 8.92 mmol L −1 following the one-step two-electron direct pathway, about 2-times higher than pristine oxygen-doped graphitic carbon nitride (4.95 mmol L −1 ). It was found that the degradation rate over prepared binary nanocomposite was reached almost 95% with the first-order kinetics. Moreover, a possible mechanism for the superior photocatalytic activity and nanostructure formation process was suggested based on the experimental results. This work is expected to open an avenue for developing novel visible-light-driven materials through nanostructure design. • A novel Oxygen-Doped g-C 3 N 4 nanosheet/NaBiS 2 heterojunction photocatalyst was prepared by calcination-hydrothermal method. • Different features of obtained materials were thoroughly characterized. • The binary nanocomposite exhibited a remarkably photocatalytic ability for H 2 O 2 production and dyes degradation. • The photocatalytic mechanism for H 2 O 2 production and dyes degradation were discussed based on direct Z-scheme mechanism. • Oxygen-Doped g-C 3 N 4 nanosheet/NaBiS 2 nanocomposite exhibited high stability and reusability.