Oxygen vacancies-modified S-scheme Bi2Ti2O7/CaTiO3heterojunction for highly efficient photocatalytic NO removal under visible light

Nan Li, Menglin Shi, Yue Xin, Wei Zhang, Jiani Qin, Ke Zhang, Haiqin Lv, Mingzhe Yuan, Chuanyi Wang

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Photocatalytic NO removal is limited by many factors, such as high recombination rate of photogenerated charge carriers and secondary pollution caused by incomplete oxidation. Here, S-scheme Bi2Ti2O7/CaTiO3 heterojunction composites with oxygen vacancies were prepared by solvothermal synthesis in conjunction with calcination. After Bi2Ti2O7/CaTiO3 calcined at 600 °C, the photocatalytic NO removal efficiency increases from 58% to 78% under visible light with the lowest production of intermediate NO2, where the initial concentration of NO was diluted to ca. 600 ppb by air stream and the flow rate was controlled at 1 L·min-1. The enhanced photocatalytic performance is attributed to the synergistic effect of S-scheme heterojunction structure and oxygen vacancy as evinced by ESR and XPS analysis. Active species trapping experiments suggest that photogenerated electrons, superoxide ions and holes are the main active species in the photocatalytic NO conversion. This study provides a reference for the design of highly efficient visible-light responsive photocatalyst by construction of S-scheme heterojunction and oxygen vacancy simultaneously.

Original languageEnglish
Article number107420
JournalJournal of Environmental Chemical Engineering
Volume10
Issue number3
DOIs
StatePublished - 1 Jun 2022
Externally publishedYes

Keywords

  • NO removal
  • Oxygen vacancy
  • Photocatalysis
  • S-scheme BiTiO/CaTiOheterojunction

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'Oxygen vacancies-modified S-scheme Bi2Ti2O7/CaTiO3heterojunction for highly efficient photocatalytic NO removal under visible light'. Together they form a unique fingerprint.

Cite this