TY - JOUR
T1 - Efficient removal of endosulfan from aqueous solution by UV-C/peroxides
T2 - A comparative study
AU - Shah, Noor S.
AU - He, Xuexiang
AU - Khan, Hasan M.
AU - Khan, Javed Ali
AU - O'Shea, Kevin E.
AU - Boccelli, Dominic L.
AU - Dionysiou, Dionysios D.
N1 - Funding Information:
The authors would like to acknowledge the Higher Education Commission (HEC), Islamabad, Pakistan for funding this project partially through an International Research Support Initiative Program (IRSIP) . D.D. Dionysiou and X. He are grateful to the Cyprus Research Promotion Foundation for providing partial financial support for this project on the evaluation of emerging AOTs through Desmi 2009–2010 which was co-funded by the European Regional Development Fund and the Republic of Cyprus through the Research Promotion Foundation (Strategic Infrastructure Project NEA Y∏O▵MH/∑TPATH/0308/09).
PY - 2013/12/15
Y1 - 2013/12/15
N2 - This study explored the efficiency of UV-C-based advanced oxidation processes (AOPs), i.e., UV/S2O82-, 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 2.45μM and UV fluence of 480mJ/cm2, was achieved by UV/S2O82-, 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.
AB - This study explored the efficiency of UV-C-based advanced oxidation processes (AOPs), i.e., UV/S2O82-, 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 2.45μM and UV fluence of 480mJ/cm2, was achieved by UV/S2O82-, 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.
KW - Advanced Oxidation Technologies (AOTs)
KW - Advanced oxidation processes (AOPs)
KW - Endosulfan
KW - Peroxides
KW - UV-C
KW - Water treatment
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UR - http://www.scopus.com/inward/citedby.url?scp=84889102137&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2013.10.019
DO - 10.1016/j.jhazmat.2013.10.019
M3 - Article
C2 - 24231332
AN - SCOPUS:84889102137
SN - 0304-3894
VL - 263
SP - 584
EP - 592
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -