A visible light active, carbon-nitrogen-sulfur co-doped TiO₂/g-C₃N₄ Z-scheme heterojunction as an effective photocatalyst to remove dye pollutants.

ABSTRACT: Heterojunction formation and heteroatom doping could be viewed as promising strategies for constructing composite photocatalysts with high visible light catalytic activity. In this work, we fabricated a carbon, nitrogen and sulfur co-doped TiO₂/g-C₃N₄ (CNS-TiO₂/g-C₃N₄) Z-scheme heterojunction photocatalyst composite via one-step hydrothermal and calcination methods. Compared with pure TiO₂ and g-C₃N₄, the CNS-TiO₂/g-C₃N₄ Z-scheme heterojunction photocatalyst possessed excellent degradation performance under visible light irradiation. Due to the formation of the Z-scheme heterostructure, the utilization rate of the photogenerated electrons-holes generated by the catalyst was increased, which enhanced the catalytic activity. Moreover, the heteroatom doping (C, N and S) could efficiently tailor the band gap of TiO₂ and facilitate electron transition, contributing to enhancing the degradation ability under visible light. The CNS-TiO₂/g-C₃N₄-2 exhibited a superior photocatalytic degradation efficiency (k = 0.069 min^-1) for methyl orange dye (MO), which is higher than those of pure TiO₂ (k = 0.001 min^-1) and g-C₃N₄ (k = 0.012 min^-1), showing excellent photocatalytic activity against organic pollutants.

SUBMITTER: Huang Z 

PROVIDER: S-EPMC9032027 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature