Novel column reactor design for simultaneous photocatalysis and adsorption of 1-naphthol by FeOOH/peroxymonosulfate: Modelling the kinetics and concentration gradient

Hiu Lam So, Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

This study demonstrated a simultaneous photocatalysis and adsorption of 1-naphthol by peroxymonosulfate (PMS), FeOOH and UV-C in a novel column reactor, which is composed of a submerged UV-C lamp, mixed quartz bead-FeOOH media bed and a continuous supply of oxidant. Around 80 % of 1-naphthol was removed at its optimal condition. The reaction mechanism was found to be pH dependent. At lower pH, photocatalysis and adsorption are favored as the catalyst surface is protonated (≡FeOH2+) to promote PMS activation and 1-naphthol adsorption, and the dissolution of Fe3+ enhanced homogeneous activation of PMS. At pH level higher than 8, the reaction becomes retarded due to the deprotonation of catalyst surface and dissociation of 1-naphthol into its conjugate base. Superoxide radical (O2•-), singlet oxygen (1O2) and sulfate radical (SO4•-) were confirmed to contribute to 1-naphthol oxidation. The reactor design was optimized at 20 min retention time. Due to the regeneration of FeIII/FeII sites on FeOOH, the performance of reused catalyst is maintained at 90 % after 5 cycles of reuse. A quadratic regression with R2 = 0.929 was used to model the concentration gradient of 1-naphthol along the column at different time intervals.

Original languageEnglish
Article number138598
JournalChemical Engineering Journal
Volume451
DOIs
Publication statusPublished - 1 Jan 2023

Keywords

  • Adsorption
  • Advanced oxidation process
  • Column reactor
  • Fenton-like process
  • Photocatalysis
  • Regression model

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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