Waste-derived MCM-41 as dual-functional support for cobalt ferrite: Performance as peroxymonosulfate activator for ciprofloxacin decontamination

Zheng Yi Choong, Naveena Subramaniam, Mohamed Faisal Gasim, Mohammad Anwar Mohamed Iqbal, Chao He, Kun Yi Andrew Lin, Wen Da Oh

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Herein, a series of CoFe2O4 decorated on waste-derived Mobil Composition of Matter No. 41 (MCM-41) was developed. Incorporation of MCM-41 as a support for CoFe2O4 (CFMCM) provides dual functionality to disperse the catalyst and adsorb leached metal, leading to remarkable performance and stability. The CFMCM was used as a peroxymonosulfate (PMS) activator for ciprofloxacin (CIP) removal indicating that CFMCM with 11 wt% CoFe2O4 (CFMCM-11) had the highest performance (kapp = 0.17 min−1). Increasing the catalyst loading and PMS dosage contributed positively to the CIP degradation. The catalyst can be reused at least 3 times without significant metal leaching (<35 µg/L) showing that it is stable. Analysis of the dominant reactive species using scavengers revealed that SO4•− was the major reactive species while HO played a minor role. The SO4•− and HO were generated from the redox transition between Co2+/Co3+ and Fe2+/Fe3+. Based on the intermediates identified, the CIP degradation pathways consisting of piperazine ring oxidation, and decarboxylation reactions were proposed. Overall, this study shows that the waste-derived materials can be integrated as part of the strategy to develop catalysts for environmental applications.

Original languageEnglish
Article number158861
JournalApplied Surface Science
Volume645
Early online date7 Nov 2023
DOIs
Publication statusPublished - 1 Feb 2024
Publication typeA1 Journal article-refereed

Keywords

  • Ciprofloxacin
  • Hydroxyl radical
  • Peroxymonosulfate
  • Sulfate radical
  • Waste-derived MCM-41

Publication forum classification

  • Publication forum level 2

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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