Performance analysis of rGO-bridged g-C3N4/ZnV2O6 S-scheme heterojunction for CO2 photoreduction with H2O in an externally reflected photoreactor

Abdullah Bafaqeer*, Muhammad Tahir, Nor Aishah Saidina Amin, Aniz Chennampilly Ummer, Hammam Abdurabu Thabit, Duraisami Dhamodharan, Shakeel Ahmed, Naveen Kumar

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The photocatalytic conversion of CO2 with H2O over rGO-bridged g-C3N4/ZnV2O6 S-scheme heterojunction using an externally reflected photoreactor has been investigated. The structure and properties of photocatalysts, prepared via the one-pot solvothermal method, were characterized by XRD, RAMAN, FESEM, EDX, HRTEM, UV–vis and PL spectrophotometry. The 4 % rGO-bridged g-C3N4/ZnV2O6 (1:1) nanocomposite registered the highest CH3OH yield. The maximum yield of CH3OH over 4 % rGO-bridged g-C3N4/ZnV2O6 (1:1) nanocomposite was 6246.1 μmol/g-cat; 1.34 and 1.51 folds higher than g-C3N4/ZnV2O6 (1:1) and ZnV2O6 photocatalysts, respectively. Significant enhancement in quantum efficiency of an externally reflected photoreactor over 4 % rGO-bridged g-C3N4/ZnV2O6 (1:1) nanocomposite was observed compared to the slurry photoreactor. This is obviously because of the greater mobility of charges with hindered recombination rate and higher photonic efficiency. The stability of 4 % rGO-bridged g-C3N4/ZnV2O6 (1:1) nanocomposite was partially reduced after several cyclic runs. It is believed that the photocatalyst consisting of three components has demonstrated improved photocatalytic activity through a S-scheme mechanism, utilizing rGO as an electron mediator to enhance the overall performance of the S-scheme heterojunction.

Original languageEnglish
Article number171833
JournalJournal of Alloys and Compounds
Volume968
DOIs
StatePublished - 15 Dec 2023

Bibliographical note

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

  • CO reduction
  • Externally reflected photoreactor
  • Performance analysis
  • S-scheme heterojunction
  • Solar fuels
  • g-CN/rGO/ZnVO nanocomposite

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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