Role of eaq⁻, ·OH and H· in radiolytic degradation of atrazine: a kinetic and mechanistic approach

Journal of Hazardous Materials
Javed Ali KhanHasan M Khan

Abstract

The degradation of atrazine was investigated in aqueous solution by gamma-ray irradiation. 8.11 μM initial atrazine concentration could be completely removed in N₂ saturated solution by applying 3500 Gy radiation dose at a dose rate of 296 Gy h(-1). Significant removal of atrazine (i.e., 39.4%) was observed at an absorbed dose of 1184 Gy in air saturated solution and the removal efficiency was promoted to 50.5 and 65.4% in the presence of N₂O and N₂ gases, respectively. The relative contributions of hydrated electron, hydroxyl radical and hydrogen radical toward atrazine degradation were determined as ratio of observed dose constant (kobs) and found to be 5: 3: 1 for keaq(-): k·OH: kH·, respectively. The degradation efficiency of atrazine was 69.5, 55.6 and 37.3% at pH 12.1, 1.7 and 5.7, respectively. A degradation mechanism was proposed based on the identified degradation by-products by gas chromatography-mass spectrometry. Taking the relative contributions of oxidative and reductive species to atrazine degradation into account, reductive pathway proved to be a better approach for the radiolytic treatment of atrazine contaminated water.

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Citations

Mar 17, 2016·Environmental Science and Pollution Research International·Noor S ShahHasan M Khan
Jul 2, 2016·The Science of the Total Environment·José Rivera-UtrillaAntonio J Mota
Feb 9, 2017·Journal of Hazardous Materials·Zhuyu SunQi Zhou
Mar 2, 2019·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Haishen Li, Bo Zhou
Apr 17, 2020·Water Research·Xiujuan KongJingyun Fang

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