Fe(III)-loaded activated carbon as catalyst to improve omethoate degradation by ozone in water

Wencui Ling, Zhimin Qiang*, Yanwei Shi, Tao Zhang, Bingzhi Dong

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

Omethoate (OMT), a typical organophosphorus pesticide and also an oxidation byproduct of dimethoate, is very difficult to remove from water due to its hydrophilic nature and relatively low reactivity towards ozone. In this work, Fe(III)-loaded activated carbon (Fe@AC) was prepared and used as catalyst to promote OMT degradation by ozone. The catalytic activity of Fe@AC was investigated under various experiment conditions. Results indicate that the OMT removal was significantly enhanced in O3/Fe@AC through effective generation of hydroxyl radicals (·OH), as compared to ozonation alone and O3/AC. The Fe(III) deposited on AC mainly existed in the form of ferrihydrite (FHD) particles which provided the main active sites promoting ozone decomposition. The optimal pH ranged from 7.0 to 8.0 for catalytic ozonation, which corresponded to a nearly neutral surface charge of the catalyst. The apparent rate constant of OMT degradation was almost linearly correlated with the aqueous ozone concentration. The acute toxicity of the reaction solution was substantially reduced by catalytic ozonation with Fe@AC.

Original languageEnglish (US)
Pages (from-to)23-29
Number of pages7
JournalJournal of Molecular Catalysis A: Chemical
Volume342-343
DOIs
StatePublished - Jun 1 2011

Keywords

  • Acute toxicity
  • Catalytic ozonation
  • Fe(III)-loaded activated carbon
  • Omethoate
  • Surface charge

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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