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Kinetic Effect of Humic Acid on Alachlor Degradation by Anodic Fenton Treatment

Graduate Field of Environmental Toxicology, TXA, MVR Hall, Cornell University, NY 14853-4401

View larger version (20K): [in a new window]   Fig. 1. Degradation of alachlor in pure aqueous solution by membrane anodic Fenton treatment (AFT) at different delivery rates of Fenton reagent. Points are experimental data and lines are fitting results using the AFT kinetic model.

View larger version (17K): [in a new window]   Fig. 2. Degradation of alachlor in slurry with different amounts of humic acid by anodic Fenton treatment (AFT) at 0.050 A. Points are experimental data. Lines are fitting results using (a) the AFT kinetic model, (b) both the AFT model and the first-order model, and (c) the first-order model.

View larger version (25K): [in a new window]   Fig. 3. Degradation of alachlor in 2.50 g L–1 humic acid slurry by anodic Fenton treatment (AFT) at different delivery rates of Fenton reagent. The H2O2 to Fe2+ ratio is kept at 10:1. Points are experimental data and lines are fitting results using the first-order model. The last two points are not included in model fitting for data from treatment at 0.090 or 0.120 A.

View larger version (13K): [in a new window]   Fig. 4. Correlation between first-order rate constant of alachlor anodic Fenton treatment (AFT) degradation in 2.50 g L–1 humic acid slurry and delivery rate of ferrous ion.

View larger version (14K): [in a new window]   Fig. 5. Degradation of alachlor in 200 mL of 2.50 g L–1 humic acid slurry by anodic Fenton treatment (AFT) and classic Fenton treatment (CFT) with the same amount of ferrous ion and hydrogen peroxide. The H2O2 to Fe2+ ratio is kept at 10:1.

View larger version (17K): [in a new window]   Fig. 6. Degradation kinetics of alachlor by anodic Fenton treatment (AFT) in humic acid extract solution with and without pre-addition of ferric ion. Points are experimental data and lines are fitting results using the AFT model.

View larger version (20K): [in a new window]   Fig. 7. Changes of [H+] in pure aqueous alachlor solution, humic acid extract–alachlor solution, and humic acid–alachlor slurry during anodic Fenton treatment (AFT) at 0.050 A.

View larger version (12K): [in a new window]   Fig. 8. Degradation of alachlor by anodic Fenton treatment (AFT) at 0.050 A in phosphate buffer solution. Concentrations of NaH2PO4 and Na2HPO4 are each 1.6 mmol L–1. Points are experimental data and line is the fitting result using the first-order model.

View larger version (20K): [in a new window]   Fig. 9. Degradation kinetics of alachlor by anodic Fenton treatment (AFT) at 0.050 A in humic acid extract solution with initial pH adjusted to 3.05 and in pure solution without initial pH adjustment. Points are experimental data and lines are fitting results using the AFT model.

View larger version (19K): [in a new window]   Fig. 10. Degradation kinetics of alachlor, metolachlor, 2,4-D, carbaryl, and metribuzin in 2.50 g L–1 humic acid slurry by anodic Fenton treatment (AFT) at 0.050 A. Points are experimental data and lines are fitting results using the first-order kinetic model.