Photochemical degradation of alachlor in water
| Autor: | Tajana Đurkić, Jelena Molnar Jazić, Jasmina Agbaba, Marijana Kragulj Isakovski, Aleksandra Tubić, Snežana Maletić, B. Dalmacija |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Croatian Journal of Food Science and Technology, Vol 9, Iss 2, Pp 187-191 (2017) |
| Druh dokumentu: | article |
| ISSN: | 1847-3466 1848-9923 |
| DOI: | 10.17508/CJFST.2017.9.2.16 |
| Popis: | 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. |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|