Rational construction of CeO2–ZrO2@MoS2 hybrid nanoflowers for enhanced sonophotocatalytic degradation of naproxen: Mechanisms and degradation pathways

Kristy Talukdar, Karunamoorthy Saravanakumar, Yejin Kim, Aqsa Fayyaz, Gyuri Kim, Yeomin Yoon, Chang Min Park

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

This study proposed a novel heterogeneous sonophotocatalytic system to effectively treat pharmaceutical wastewater employing molybdenum disulfide (MoS2) decorated ceria (CeO2)-zirconia (ZrO2) ternary hybrid nanoflowers (CZx/100 M). The generation of dominant oxidizing species, both radical and nonradical, was deeply scrutinized under ultrasound (US) irradiation coupled with visible-light by electron spin resonance spectroscopy analysis and scavenging experiments, for the first time. Interestingly, the pairing of US with visible-light illumination in a sonophotocatalytic degradation system resulted in 96% degradation efficiency of naproxen (NPX) within 40 min, which confirmed that excellent synergistic effect of sono- and photocatalytic mechanisms in the presence of 0.5 g/L sonophotocatalyst at pH 5.8. The sonophotocatalytic activity was also manifested at various reaction time, catalyst dose, solution pH, initial NPX concentrations, and US frequency and power and in the presence of various anions. The mechanism for the catalytic degradation of NPX is proposed in the US/Vis/CZx/100 M system, and transformation products formed during the process were identified by an ultra-high performance liquid chromatography-mass spectrometry technique.

Original languageEnglish
Article number108780
JournalComposites Part B: Engineering
Volume215
DOIs
StatePublished - 15 Jun 2021

Bibliographical note

Publisher Copyright:
© 2021 Elsevier Ltd

Keywords

  • Ceria-zirconia
  • Molybdenum disulfide
  • Naproxen
  • Ultrasound
  • Visible-light

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