Intrinsic carbon-doping induced synthesis of oxygen vacancies-mediated TiO2 nanocrystals: Enhanced photocatalytic NO removal performance and mechanism

Zhanyong Gu, Zhitao Cui, Zijing Wang, Ken Sinkou Qin, Yusuke Asakura, Takuya Hasegawa, Kenta Hongo, Ryo Maezono, Shu Yin

Research output: Contribution to journalArticlepeer-review

Abstract

Herein, we developed a facile approach to fabricate oxygen vacancies-mediated TiO2 (OVs-TiO2) nanocrystals via an intrinsic carbon-doping induced strategy. The intrinsic carbon-doped TiO2 nanocrystals were firstly synthesized by water-controlled-releasing solvothermal (WCRS) process using ethanol, acetic acid and titanium tetraisopropoxide (TTIP) as precursors. The carbon-doped TiO2 was calcined at 325 °C under N2 atmosphere to introduce the OVs. The obtained OVs-TiO2 displayed outstanding photocatalytic NO removal performance under visible light irradiation (λ˃510 nm), in comparison with the commercial P25. With the aid of DFT calculations, we revealed that the intrinsic carbon-doping was beneficial for the formations of OVs in carbon-doped TiO2. Moreover, the OVs played crucial roles in improving light absorption, facilitating charge separation, and activating surface reactions to enhance the photocatalytic NO removal performance.

Original languageEnglish
Pages (from-to)179-189
Number of pages11
JournalJournal of Catalysis
Volume393
DOIs
Publication statusPublished - 2021 Jan

Keywords

  • Intrinsic carbon-doping
  • Mechanism
  • Oxygen vacancies
  • Photocatalytic NO removal
  • Visible light

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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