Degradative Oxidation of 2,4,6 Trichlorophenol Using Advanced Oxidation Processes - A Comparative Study

摘要

In the present study, a comparative assessment of 2,4,6-T (2,4.6-Trichlorophenol) degradation by different AOPs (Advanced Oxidation Processes -UV, UV/ H_2O_2, Fenton, UV/Fenton and UV/TiO_2) in the laboratory scale is performed. The effects of different reactant concentrations and pH are assessed. 2,4,6-T removal, Total Organic Carbon mineralization (TOC) and dechlorination are monitored. Of all the AOPs, UV/Fenton process is more effective in degrading 2,4,6-T. The optimum conditions obtained for the best degradation with UV/Fenton are: pH=3, Fe~(+2) concentration of about 5 ppm, and peroxide concentration of 100 ppm for an initial 100 ppm of 2,4,6 T concentration at room temperature. In these conditions,rna pscudo first-order rate constant is evaluated. The degradation rate of 2,4,6 T followed the order:rnUV/Fcton > UV/TiO_2 > UV/H_2O_2 > Feton > UV.