Редокс поведение наноразмерных двойных ортофосфатов церия(IV) состава ACe₂(PO₄)₃ (А = NH₄⁺, K⁺, Rb⁺)

Проведено сравнительное исследование окислительно-восстановительного поведения нанокристаллических изоструктурных двойных ортофосфатов церия(IV) состава ACe₂(PO₄)₃ (А = NH₄⁺, K⁺, Rb⁺). Установлено, что по отношению к алкилпероксильным радикалам или пероксиду водорода в качестве активных форм кислорода все двойные фосфаты церия(IV) действовали как антиоксиданты или прооксиданты, соответственно. Антиоксидантная активность по отношению к алкилпероксильным радикалам оказалась выше у фосфатов, содержащих калий или рубидий. Примечательно, что для KCe₂(PO₄)₃ и RbCe₂(PO₄)₃ была обнаружена обратная зависимость каталитической активности от концентрации в реакции с H₂O₂, в отличие от NH₄Ce₂(PO₄)₃. Окислительно-восстановительное поведение наноразмерного диоксида церия, использованного для сравнения, было аналогично поведению ортофосфата церия(IV)-аммония, но значительно ниже в абсолютных значениях. Это было объяснено подавляющим эффектом фосфат-анионов, присутствующих в буферных растворах.

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