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 language | English |
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Pages (from-to) | 41-48 |
Number of pages | 8 |
Journal | Water Science and Technology |
Volume | 34 |
Issue number | 9 pt 5 |
DOIs | |
State | Published - 1 Nov 1996 |
Event | Proceedings of the 1996 18th Biennial Conference of the International Association on Water Quality. Part 5 - Singapore, Singapore Duration: 23 Jun 1996 → 28 Jun 1996 |
Keywords
- 2-chlorophenol
- Catalyst
- Decomposition
- Ionic strength
- pH
- Pseudo-first-order kinetics
- TOC removal
- ultrasound/H2O2 process