Enhanced photocatalytic performance of TiO2 through a novel direct dual Z-scheme design

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Abstract

A novel ternary TiO2/MoO3/g-C3N4 nanocomposite photocatalyst has been synthesized and shown to exhibit a direct dual Z-scheme photodegradation mechanism. The TiO2/MoO3/g-C3N4 nanocomposite catalyst outperforms its constituents for methylene blue degradation. The highest degradation rate constant of 0.0303 min−1 is about 3.9 times greater than that of TiO2. The improved photocatalytic activity is attributed to the enhanced visible light absorption from the g-C3N4 and α-MoO3, enhanced photogenerated hole/electron separation primarily in the TiO2 and α-MoO3, and enhanced fast charge transfer due to the existence of oxygen vacancies. The photodegradation mechanism is explained using a direct dual Z-scheme. This work affords a new insight towards designing highly efficient Z-scheme photocatalysts with enhanced visible light absorption, efficient photogenerated hole/electron separation, and strong redox ability.

Original languageEnglish
Article number147506
JournalApplied Surface Science
Volume533
DOIs
Publication statusPublished - 2020 Dec 15

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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