COMPARISON AMONG FENTON-RELATED PROCESSES TO REMOVE 2,4,-DINITROPHENOL

摘要

Several Fenton-related oxidative processes, UV/H_2O_2, Fenton reaction, Photo-Fenton-type, and Photo-Fenton have been compared to isolate the one that can effectively remove 2,4-dinitrophenol (DNP). The following criteria were adopted to screen the best oxidative process in terms of removal of DNP: residual percentage of DNP, residual percentage of ADMI color value and residual percentage of dissolved organic carbon (DOC). Results show that the PhotoFenton process outranks among others based on above-mentioned criteria. Initially, the Photo-Fenton process gives the same oxidative capability as the Fenton reaction. As reaction progresses, the Photo-Fenton process outperforms others because the irradiation energy from UV light stimulates the regeneration of ferrous ion, resulting in more hydroxyl radicals released from H_2O_2, and further enhances the removal of DNP. In addition, The analysis of pseudo first-order rate constants indicates that the removal rate of DOC is the limiting step in the photoFenton process.