In this work, the reactions of ∙OH, e aq − , and SO 4 ∙− with diethyl phthalate (DEP) were investigated in aqueous solution by pulse radiolysis, and degradation efficiencies of DEP with ∙OH and e aq − were evaluated in water using steady-state radiolysis as well. The absolute rate constants of ∙OH, e aq − , and SO 4 ∙− with DEP were determined as 2.3 × 109, 1.0 × 1010, and 1.0 × 108 M−1 s−1, respectively. The degradation efficiencies for the ∙OH and e aq − reactions were 81 and 33 %, respectively. Transient absorption spectra were observed for the intermediate radicals produced by ∙OH, e aq − , and SO 4 ∙− reactions. The results suggested that e aq − transferred to the ester group, resulting in the formation of DEP radical anions. In contrast, ∙OH and SO 4 ∙− added predominantly to the aromatic ring of DEP, forming the corresponding ∙OH adducts. The fundamental mechanistic parameters and degradation efficiencies derived from these results were significant for evaluations and applications of advanced oxidation processes.
Research on Chemical Intermediates – Springer Journals
Published: Nov 5, 2012
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