The effect of the synthesis temperature and duration on the morphology and photocatalytic activity of BiOX (X = Cl, Br, I) materials

Enikő Bárdos, Anna Krisztina Király, Zsolt Pap, Lucian Baia, Seema Garg, K. Hernádi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Bismuthoxyhalides photocatalysts (BiOX, X = Cl, Br, I) were prepared using solvothermal crystallization method. The influence of the synthesis temperature (120 °C, 140 °C, 160 °C) and duration (3 h, 24 h, 48 h) on the structural (crystal size, phase composition etc.), morphological (crystal shape), optical (bandgap values) parameters and on the resulting photocatalytic activity were investigated. The samples were characterized by the means of X-ray diffractometry (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), and diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the synthesized materials was evaluated under visible- (≥ 400 nm) and UV light (≈ 365 nm) by degrading methyl orange and Rhodamine B (RhB). The results pointed out the importance of the crystallization temperature and duration in achieving the highest photocatalytic activity, showing that the lowest temperature and the shortest duration time resulted the highest removal yields. Furthermore, a possible degradation mechanism was elaborated based on a direct hole oxidation approach and the detected degradation intermediates.

Original languageEnglish
Pages (from-to)745-756
Number of pages12
JournalApplied Surface Science
Volume479
DOIs
Publication statusPublished - Jun 15 2019

    Fingerprint

Keywords

  • Bismuth oxyhalides
  • Methyl orange
  • Photocatalysis
  • Rhodamine B
  • Semiconductor materials

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

Cite this