Catalytic oxidation of pentachlorophenol in contaminated soil suspensions by Fe+3-resin/H2O2.
Pentachlorophenol (PCP) is a wood preserving agent that is commonly found in contaminated soils at wood treatment sites. The catalytic properties of Fe+3-resin for the oxidation of PCP in aqueous solution and soil suspension with H2O2 were tested. Batch tests in aqueous solution were performed at various dosages of catalyst and H2O2, and reaction temperatures. The results showed that the oxidation of PCP in aqueous solution depends on the dose of H2O2 and the temperature. Essentially complete oxidation of 100 mgl(-1) PCP was obtained with 0.5% Fe+3-resin catalyst, 0.1 M H2O2 and at a reaction temperature of 80 degrees C. The oxidation of PCP achieved in three different soil suspensions was more than 94% within 30-50 min. Moreover, it was demonstrated that the same Fe+3-resin could be reused for at least six cycles of PCP oxidation in soil solutions without loss in efficiency unless the pH of the reaction falls below 5. It was proposed that the loss in used Fe+3-resin catalyst activity could be related to the leaching of Fe+3 at low pH.
Liou
Rey-May
RM
Department of Environmental Resources Management, Chia-Nan University of Pharmacy and Science, Tainan 717, Taiwan, ROC. mrmliou@mail.chna.edu.tw
Chen
Shin-Hsiung
SH
Hung
Mu-Ya
MY
Hsu
Chin-Shan
CS
D001419:Bacteria / Q000187:drug effects; D002384:Catalysis; D002851:Chromatography, High Pressure Liquid; D005290:Ferric Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D010416:Pentachlorophenol / Q000737:chemistry* / Q000633:toxicity; D012989:Soil Pollutants / Q000032:analysis*; D013696:Temperature; D018675:Toxicity Tests
D005290:Ferric Compounds; D012989:Soil Pollutants; D006861:Hydrogen Peroxide; D010416:Pentachlorophenol