Photochemical degradation of alachlor in water
This study investigates the photochemical degradation of alachlor, a chloroacetanilide herbicide. All experiments were conducted in ultra-pure deionized water (ASTM Type I quality) using direct ultraviolet (UV) photolysis and the UV/H2O2 advanced oxidation process. The direct UV photolysis and UV/H2...
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Published in | Croatian journal of food science and technology Vol. 9; no. 2; pp. 187 - 191 |
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Main Authors | , , , , , , |
Format | Journal Article Paper |
Language | English |
Published |
Prehrambeno-tehnološki fakultet Osijek
20.12.2017
Josip Juraj Strossmayer University of Osijek, Faculty of Food Technology Osijek |
Subjects | |
Online Access | Get full text |
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Summary: | This study investigates the photochemical degradation of alachlor, a chloroacetanilide herbicide. All experiments were conducted in ultra-pure deionized water (ASTM Type I quality) using direct ultraviolet (UV) photolysis and the UV/H2O2 advanced oxidation process. The direct UV photolysis and UV/H2O2 experiments were conducted in a commercial photochemical reactor with a quartz reaction vessel equipped with a 253.7 nm UV low pressure mercury lamp (Philips TUV 16 W). The experimental results demonstrate that UV photolysis was very effective for alachlor degradation (up to 97% removal using a high UV fluence of 4200 mJ/cm2). The UV/H2O2 process promoted alachlor degradation compared to UV photolysis alone, with a high degree of decomposition (97%) achieved at a significantly lower UV fluence of 600 mJ/cm2 when combined with 1 mg H2O2/L. The application of UV photolysis alone with a UV fluence of 600 mJ/cm2 gave a negligible 4% alachlor degradation. The photo degradation of alachlor, in both direct UV photolysis and the UV/H2O2 process, followed pseudo first-order kinetics. The degradation rate constant was about 6 times higher for the UV/H2O2 process than for UV photolysis alone. |
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Bibliography: | 191227 |
ISSN: | 1847-3466 1848-9923 |
DOI: | 10.17508/CJFST.2017.9.2.16 |