Comparative study on photocatalytic degradation of methomyl and parathion over UV-irradiated TiO2 particles in aqueous solutions

Ruey Shin Juang*, Chin Hone Chen

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

35 Scopus citations

Abstract

Photodegradation of methomyl and parathion, the representatives of carbamate and organophosphorus pesticides, respectively, over TiO2 particles under 400-W UV irradiation was investigated and compared at 40°C. All experiments were conducted at different initial pH values (4.0-10.0), initial pesticide concentrations (10-30mg/L), and TiO2 doses (0-1.5g/L). The Langmuir-Hinshelwood kinetic model was used to evaluate the apparent first-order rate constants of both pesticides at their initial stages of degradation processes. It was seen that methomyl was degraded much faster than parathion under comparable conditions, primarily due to more complicated structures of parathion molecules. The mineralization processes of methomyl and parathion by TiO2/UV were also studied on the basis of the measured total organic carbon (TOC) data. Finally, the possible degradation paths of methomyl and parathion were inferred by following the variations of the concentrations of final mineralized products with time.

Original languageEnglish
Pages (from-to)989-995
Number of pages7
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume45
Issue number3
DOIs
StatePublished - 05 2014
Externally publishedYes

Keywords

  • Degradation paths
  • Methomyl
  • Parathion
  • Photocatalytic degradation

Fingerprint

Dive into the research topics of 'Comparative study on photocatalytic degradation of methomyl and parathion over UV-irradiated TiO2 particles in aqueous solutions'. Together they form a unique fingerprint.

Cite this