Characterization and photocatalytic activity of new photocatalysts based on Ag, F-modified ZnO nanoparticles prepared by thermal shock method

Huu Thinh Pham Nguyen, Thi Minh Tram Nguyen, Chau Ngoc Hoang, Tien Khoa Le, Torben Lund, Huu Khanh Hung Nguyen, Thi Kieu Xuan Huynh*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Ag-modified ZnO, F-modified ZnO and (Ag, F)-modified ZnO nanoparticles were prepared by thermal shock method in order to study the effects of doping agents on their crystal structure, morphology, optical properties, surface structure and photocatalytic activity. The catalysts were characterized by XRD, FE-SEM, TEM, FTIR, UV–Visible diffuse reflectance and XPS spectroscopy. The photocatalytic activity was evaluated via the degradation of methylene blue under UVA and visible light irradiation. According to the results, the thermal shock process with AgNO3 did not modify the morphology but successfully created silver species on the surface of ZnO, which induces the visible light absorption and then increases the photocatalytic activity. The enhanced phototcatalytic performance was also observed in F-modified ZnO sample owing to the increase of surface hydroxyl groups and the formation of zinc vacancies. Among three modified ZnO samples, (Ag, F)-modified ZnO was found to be the best sample with the photocatalytic activity enhanced by the factor of 3 under both UVA and visible light, which may be attributed to the synergic effects of AgNO3 and KF used in thermal shock process.
Original languageEnglish
JournalArabian Journal of Chemistry
Volume13
Issue number1
Pages (from-to)1837-1847
Number of pages10
ISSN1878-5352
DOIs
Publication statusPublished - 2020

Keywords

  • ZnO nanaparticles
  • Ag-doping
  • F-doping
  • Thermal shock method
  • Photocatalytic activity

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