Photodegradation of Acid Orange 7 in a UV/acetylacetone process.
Acetylacetone (AcAc) was employed as a photo-activator for the degradation of Acid Orange 7 (AO7) under UV irradiation. The feasibility of this process (named as UV/AcAc) was evaluated through comparison with the well-established UV/H2O2 process in terms of absorption spectrum and the biodegradability of the solutions. A complete decoloration of the AO7 solution could be fulfilled with AcAc at mM level. A self-acceleration phenomenon was observed for the UV/AcAc process. The pseudo first-order decoloration rate constant of AO7 in the UV/AcAc process was several times higher than that in the UV/H2O2 process, depending on the irradiation conditions. The BOD to COD ratio of the solutions increased from below 0.1 to above 0.3, along with a slight mineralization. Based on degradation product analysis, the possible pathways for AO7 degradation in the UV/AcAc process were proposed.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, China.
Mengshu
M
Wang
Xitong
X
Liu
Bingcai
B
Pan
Shujuan
S
Zhang
D001391:Azo Compounds / Q000032:analysis / Q000737:chemistry*; D001557:Benzenesulfonates / Q000032:analysis / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007700:Kinetics; D010422:Pentanones / Q000737:chemistry*; D010782:Photolysis; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
D001391:Azo Compounds; D001557:Benzenesulfonates; D010422:Pentanones; D014874:Water Pollutants, Chemical; C008790:acetylacetone; D006861:Hydrogen Peroxide; C014722:2-naphthol orange
Acetylacetone; Acid Orange 7; Mechanism; Photodecoloration