Efficient removal of endosulfan from aqueous solution by UV-C/peroxides: a comparative study.
This study explored the efficiency of UV-C-based advanced oxidation processes (AOPs), i.e., UV/S2O8(2-), UV/HSO5(-), and UV/H2O2 for the degradation of endosulfan, an organochlorine insecticide and an emerging water pollutant. A significant removal, 91%, 86%, and 64%, of endosulfan, at an initial concentration of 2.45 μM and UV fluence of 480 mJ/cm(2), was achieved by UV/S2O8(2-), UV/HSO5(-), and UV/H2O2 processes, respectively, at a [peroxide]0/[endosulfan]0 molar ratio of 20. The efficiency of these processes was, however, inhibited in the presence of radical scavengers, such as alcohols (e.g., tertiary butyl alcohol and isopropyl alcohol) and natural organic matter (NOM). The inhibition was also influenced by common inorganic anions in the order of nitrite > bicarbonate > chloride > nitrate ≈ sulfate. The observed pseudo-first-order rate constant decreased while the degradation rate increased with increasing initial concentration of the target contaminant. The degradation mechanism of endosulfan by the AOPs was evaluated revealing the main by-product as endosulfan ether. Results of this study suggest that UV-C-based AOPs are potential methods for the removal of pesticides, such as endosulfan and its by-products, from contaminated water.
Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan; Environmental Engineering and Science Program, University of Cincinnati, 705 Engineering Research Center, Cincinnati, OH 45221-0012, USA.
Noor S
NS
Shah
Xuexiang
X
He
Hasan M
HM
Khan
Javed Ali
JA
Khan
Kevin E
KE
O'Shea
Dominic L
DL
Boccelli
Dionysios D
DD
Dionysiou
D000438:Alcohols / Q000737:chemistry; D000838:Anions; D004305:Dose-Response Relationship, Drug; D004307:Dose-Response Relationship, Radiation; D004726:Endosulfan / Q000031:analogs & derivatives / Q000032:analysis* / Q000737:chemistry; D016166:Free Radical Scavengers; D008401:Gas Chromatography-Mass Spectrometry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D017665:Hydroxyl Radical; D007700:Kinetics; D008956:Models, Chemical; D009930:Organic Chemicals; D010100:Oxygen / Q000737:chemistry; D010545:Peroxides / Q000737:chemistry*; D010575:Pesticides / Q000737:chemistry; D010782:Photolysis; D013431:Sulfates / Q000737:chemistry; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
D000438:Alcohols; D000838:Anions; D016166:Free Radical Scavengers; D009930:Organic Chemicals; D010545:Peroxides; D010575:Pesticides; D013431:Sulfates; D014874:Water Pollutants, Chemical; C544690:endosulfan ether; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D004726:Endosulfan; D010100:Oxygen
Advanced Oxidation Technologies (AOTs); Advanced oxidation processes (AOPs); Endosulfan; Peroxides; UV-C; Water treatment