Abstract
Isoproturon (IP), a systemic herbicide, is also considered as a potential groundwater contaminant. In the present study, the radiation-induced degradation of IP employing gamma-rays is investigated. Several factors such as radiation dose, pH and the presence of co-contaminants such as H2O2, isopropanol, tert-butanol, coffee waste (CW), carbonized coffee waste (CWC) and TiO2, which might affect the degradation process are examined. The IP concentration decreased with the increase of radiation dose and the degradation obtained at pH = 7.0 is found to be 90%. The degradation efficiency decreases with the increase of initial concentration at the same radiation dose. Co-contaminants such as H2O2, TiO2 and CW had increased the degradation efficiency. The process followed by first order reaction kinetics. Furthermore, the increase of the concentration of H2O2, isopropanol, tert-butanol and the weight of TiO2, CW and CWC resulted in the decrease of the degradation values. The pH value was found to effect the removal efficiency and the degradation process was enhanced under neutral condition. IP concentration of 30 mu M was selected as standard, while 0.63 kGy was selected as the standard radiation dose. (C) 2020 The Authors. Published by Elsevier B.V. on behalf of King Saud University.