Dual pathways drive ozone decomposition in water. (IMAGE)
Caption
Dual pathways drive ozone decomposition in water. Schematic illustration of ozone (O₃) decomposition in aqueous solution through hydroxide ion (OH⁻)- and hydroperoxide ion (HO₂⁻)-initiated chain reactions. In the O₃/OH⁻ pathway, O₃ undergoes oxygen-atom transfer with spin crossover to form triplet oxygen [O₂(³Σg⁻)] and HO₂⁻, with hydroxyl radical (•OH) yield increasing with pH. In the O₃/HO₂⁻ pathway, two competing routes operate: electron transfer generates ozonide radical (O₃•⁻) and hydroperoxyl radical (HO₂•), while oxygen-atom transfer produces O₂(³Σg⁻) and OH⁻. Together, these parallel pathways explain the stable approximately 67% •OH yield observed in the peroxone process.
Credit
Environmental Science and Ecotechnology
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