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Role of aqueous electron and hydroxyl radical in the removal of endosulfan from aqueous solution using gamma irradiation.
J Hazard Mater. 2014 Aug 15; 278:40-8.JH

Abstract

The removal of endosulfan, an emerging water pollutant, from water was investigated using gamma irradiation based advanced oxidation and reduction processes (AORPs). A significant removal, 97% of initially 1.0 μM endosulfan was achieved at an absorbed dose of 1020 Gy. The removal of endosulfan by gamma-rays irradiation was influenced by an absorbed dose and significantly increased in the presence of aqueous electron (eaq(-)). However, efficiency of the process was inhibited in the presence of eaq(-) scavengers, such as N2O, NO3(-), acid, and Fe(3+). The observed dose constant decreased while radiation yield (G-value) increased with increasing initial concentrations of the target contaminant and decreasing dose-rate. The removal efficiency of endosulfan II was lower than endosulfan I. The degradation mechanism of endosulfan by the AORPs was proposed showing that reductive pathways involving eaq(-) started at the chlorine attached to the ring while oxidative pathway was initiated due to attack of hydroxyl radical at the SO bond. The mass balance showed 95% loss of chloride from endosulfan at an absorbed dose of 1020 Gy. The formation of chloride and acetate suggest that gamma irradiation based AORPs are potential methods for the removal of endosulfan and its by-products from contaminated water.

Authors+Show Affiliations

Institute of Chemical Sciences, University of Swat, Swat 19130, Pakistan; Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan. Electronic address: samadchemistry@gmail.com.Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.Radiation Chemistry Laboratory, National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar 25120, Pakistan.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24952221

Citation

Shah, Noor S., et al. "Role of Aqueous Electron and Hydroxyl Radical in the Removal of Endosulfan From Aqueous Solution Using Gamma Irradiation." Journal of Hazardous Materials, vol. 278, 2014, pp. 40-8.
Shah NS, Khan JA, Nawaz S, et al. Role of aqueous electron and hydroxyl radical in the removal of endosulfan from aqueous solution using gamma irradiation. J Hazard Mater. 2014;278:40-8.
Shah, N. S., Khan, J. A., Nawaz, S., & Khan, H. M. (2014). Role of aqueous electron and hydroxyl radical in the removal of endosulfan from aqueous solution using gamma irradiation. Journal of Hazardous Materials, 278, 40-8. https://doi.org/10.1016/j.jhazmat.2014.05.073
Shah NS, et al. Role of Aqueous Electron and Hydroxyl Radical in the Removal of Endosulfan From Aqueous Solution Using Gamma Irradiation. J Hazard Mater. 2014 Aug 15;278:40-8. PubMed PMID: 24952221.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Role of aqueous electron and hydroxyl radical in the removal of endosulfan from aqueous solution using gamma irradiation. AU - Shah,Noor S, AU - Khan,Javed Ali, AU - Nawaz,Shah, AU - Khan,Hasan M, Y1 - 2014/06/02/ PY - 2014/03/29/received PY - 2014/05/22/revised PY - 2014/05/26/accepted PY - 2014/6/22/entrez PY - 2014/6/22/pubmed PY - 2015/4/4/medline KW - AORPs KW - Degradation mechanism KW - Endosulfan KW - Gamma irradiation KW - Water treatment SP - 40 EP - 8 JF - Journal of hazardous materials JO - J Hazard Mater VL - 278 N2 - The removal of endosulfan, an emerging water pollutant, from water was investigated using gamma irradiation based advanced oxidation and reduction processes (AORPs). A significant removal, 97% of initially 1.0 μM endosulfan was achieved at an absorbed dose of 1020 Gy. The removal of endosulfan by gamma-rays irradiation was influenced by an absorbed dose and significantly increased in the presence of aqueous electron (eaq(-)). However, efficiency of the process was inhibited in the presence of eaq(-) scavengers, such as N2O, NO3(-), acid, and Fe(3+). The observed dose constant decreased while radiation yield (G-value) increased with increasing initial concentrations of the target contaminant and decreasing dose-rate. The removal efficiency of endosulfan II was lower than endosulfan I. The degradation mechanism of endosulfan by the AORPs was proposed showing that reductive pathways involving eaq(-) started at the chlorine attached to the ring while oxidative pathway was initiated due to attack of hydroxyl radical at the SO bond. The mass balance showed 95% loss of chloride from endosulfan at an absorbed dose of 1020 Gy. The formation of chloride and acetate suggest that gamma irradiation based AORPs are potential methods for the removal of endosulfan and its by-products from contaminated water. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/24952221/Role_of_aqueous_electron_and_hydroxyl_radical_in_the_removal_of_endosulfan_from_aqueous_solution_using_gamma_irradiation_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(14)00418-X DB - PRIME DP - Unbound Medicine ER -