Enhancement of decomposition of 2-chlorophenol with ultrasound/H 2 O 2 process

Jih-Gaw Lin*, Cheng Nan Chang, Jer Ren Wu, Ying Shih Ma

*Corresponding author for this work

Research output: Contribution to journalConference article

55 Scopus citations

Abstract

We investigated the effects of pH, ionic strength, catalyst, and initial concentration on both decomposition of 2-chlorophenol (2-cp) and removal of total organic carbon (TOC) in aqueous solution with ultrasonic amplitude 120 μm and H 2 O 2 (200 mg/l). When the initial concentrations of 2-cp was 100 mg/l and the pH was controlled at 3, the rate of 2-cp decomposition was enhanced up to 6.6-fold and TOC removal up to 9.8-fold over pH controlled at 11. At pH 3, the efficiency of decomposition of 2-cp was 99% but the removal of TOC was only 63%; a similar situation applied at pH 7 and 11. Hence intermediate compounds were produced and 2-cp was not completely mineralized. When the concentration of ionic strength was increased from 0.001 to 0.1 M, the rate of 2-cp decomposition was enhanced only 0.3-fold, whereas the TOC removal was not enhanced. In comparison of the effects of pH and ionic strength, pH had greater influence on both 2-cp decomposition and TOC removal than ionic strength. The effect of a catalyst (FeSO 4 ) on decomposition of 2-cp was insignificant comparing with direct addition of H 2 O 2 . The reaction rate at a smaller initial concentration of 2-cp (10 mg/l) was more rapid than at a greater one (100 mg/l). The rate of 2-cp decomposition and TOC removal appeared to follow pseudo-first-order reaction kinetics.

Original languageEnglish
Pages (from-to)41-48
Number of pages8
JournalWater Science and Technology
Volume34
Issue number9 pt 5
DOIs
StatePublished - 1 Jan 1996
EventProceedings of the 1996 18th Biennial Conference of the International Association on Water Quality. Part 5 - Singapore, Singapore
Duration: 23 Jun 199628 Jun 1996

Keywords

  • 2-chlorophenol
  • Catalyst
  • Decomposition
  • Ionic strength
  • pH
  • Pseudo-first-order kinetics
  • TOC removal

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