title: Gamma irradiation-induced complete degradation and mineralization of phenol in aqueous solution: Effects of reagent.
abstract: This study aims to gain new insight into phenol degradation and mineralization in aqueous solution using ionizing radiation to control its radiolytic elimination under various experimental conditions and to present the different radical reactions involved in water radiolysis. The most obvious finding of this study is that the combination of a reagent, i.e., O3, H2O2, N2O, O2,or S2O82-, with γ-rays effectively enhances the radiolytic system for phenol degradation or mineralization. Radiolytic yield is higher with H2O2than with S2O82-. For the γ-ray/free O2, γ-ray/H2O2, γ-ray/S2O82-, γ-ray/N2O, and γ-ray/N2systems, the absorbed doses for 90% phenol elimination are 1.7, 0.85, 1.65, 1.2, and 6.4kGy, respectively; in contrast, phenol can be decomposed totally and directly via reaction with molecular ozone. The lowest dose constant for phenol removal is determined for γ-ray/HCO3-. 89% of mineralization is reached for an absorbed dose of 10kGy with a γ-ray/S2O82-combination.
authors.affiliation: King Abdulaziz City for Science and Technology-KACST, Nuclear Science Research Institute, National Center for Irradiation Technology, P. O. BOX 6086, Riyadh 11442, Saudi Arabia. Electronic address: khuraiji@kacst.edu.sa.
authors.forename: Turki S
authors.initials: TS
authors.lastname: Alkhuraiji
authors.affiliation: Ph.D. water treatment, Université de Poitiers.
authors.forename: Sahidou O B
authors.initials: SOB
authors.lastname: Boukari
authors.affiliation: King Abdulaziz City for Science and Technology-KACST, Nuclear Science Research Institute, National Center for Irradiation Technology, P. O. BOX 6086, Riyadh 11442, Saudi Arabia.
authors.forename: Fadhl S
authors.initials: FS
authors.lastname: Alfadhl
keywords: Advanced oxidation process; Ionizing radiation; Mineralization; Persulfate ions; Remediation