Sulfur-doped g-C3N4/TiO2 S-scheme heterojunction photocatalyst for Congo Red photodegradation

Constructing step-scheme (S-scheme) heterojunctions has been confirmed as a promising strategy for enhancing the photocatalytic activity of composite materials. In this work, series sulfur-doped g-C3N4 (SCN)/TiO2 S-scheme photocatalysts were synthesized using electrospinning and calcination methods. The as-prepared SCN/TiO2 composites showed superior performance than pure TiO2 SCN in degradation Congo Red (CR) aqueous solution. significant enhancement benefited not only from 1D well-distributed nanostructure, but also heterojunction. Furthermore, XPS analyses DFT calculations demonstrated that electrons transferred to across interface composites. built-in electric field, band edge bending, Coulomb interaction synergistically facilitated recombination relatively useless holes hybrid when was irradiated by simulated solar light. Therefore, remaining with higher reducibility oxidizability endowed supreme redox ability. These results adequately verified radical trapping experiments, ESR tests, situ analyses, suggesting electron immigration photocatalyst followed heterojunction mechanism. This work can enrich our knowledge design fabrication novel provide solving environmental pollution future.