Photooxidative degradation of 4-nitrophenol (4-NP) in UV/H2O2 process: influence of operational parameters and reaction mechanism.
The photooxidative degradation of 4-nitrophenol (4-NP) was studied in the UV/H2O2 process. The effects of applied H2O2 dose, initial 4-NP concentration and UV light intensity have been studied. Degradation was complete in 13 min and follows apparent first-order kinetics. The removal efficiency of 4-NP depends on the operational parameters and increases as the initial concentration of H2O2 and light intensity are increased but it decreases when the initial concentration of 4-NP is increased. From HPLC analysis, major intermediate products were hydroxyl derivatives of 4-NP as a result of photooxidative hydroxylation.
Daneshvar
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N
Water and Wastewater Treatment Research Laboratory, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, CP 51664, Tabriz, Islamic Republic of Iran. nezam_daneshvar@yahoo.com
Behnajady
M A
MA
Zorriyeh Asghar
Y
Y
D002851:Chromatography, High Pressure Liquid; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D009596:Nitrophenols / Q000737:chemistry*; D010084:Oxidation-Reduction; D010782:Photolysis; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods*
D009596:Nitrophenols; D006861:Hydrogen Peroxide; C024836:4-nitrophenol