Comparison among Fenton-related processes to remove 2,4-dinitrophenol

Several Fenton-related oxidative processes, UV/H2O2, Fenton reaction, Photo -Fenton-type, and Photo-Fenton have been compared to isolate the one that c an effectively remove 2,4-dinitrophenol (DNP). The following criteria were adopted to screen the best oxidative process in terms of removal of DNP: re sidual percentage of DNP, residual percentage of ADMI color value and resid ual percentage of dissolved organic carbon (DOC). Results show that the Pho to-Fenton 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 outpe rforms others because the irradiation energy from UV light stimulates the r egeneration of ferrous ion, resulting in more hydroxyl radicals released fr om H2O2, and further enhances the removal of DNP. In addition, The analysis of pseudo first-order rate constants indicates that the removal rate of DO C is the limiting step in the Photo-Fenton process.