Синтез, структура и фотофентоноподобная активность мезопористых нанокомпозитов PrFeO3–TiO2
Аннотация
Пористые нанокомпозиты на основе PrFeO3–TiO2 были синтезированы методом глицин-нитратного горения с различным массовым содержанием TiO2 (0-7.5 %) и последующей термообработкой на воздухе. Результаты рентгенофазового анализа и Рамановской спектроскопии показали наличие TiO2 в виде ультрадисперсной фазы структурно близкой к анатазу. Морфология, удельная поверхность и пористая структура полученных порошков была охарактеризована методом сканирующей электронной микроскопии и адсорбционно-структурного анализа, по результатам которых установлено, что образцы имеют пенообразную мезопористую структуру. Площадь удельной поверхности и средний размер пор находятся в диапазоне 7.6–17.8 м2/г и 7.2–15.2 нм соответственно и меняются в зависимости от содержания TiO2. Оптические свойства нанокомпозитов были исследованы методом УФ-видимой спектроскопии диффузного отражения, по результатам которой определена энергия запрещенной зоны, находящаяся в диапазоне значений 2.11–2.26 эВ. Фотокаталитическая активность нанокомпозитов PrFeO3–TiO2 была исследована
в процессе фотофентоноподобной деградации метилового фиолетового под действием видимого света. Было показано, что максимальная константа скорости реакции составляет 0.095 мин–1, что в десятки раз выше, чем для известных аналогов на основе ортоферритов. Полученные фотокатализаторы также характеризуются высокой циклической стабильностью работы. На основании проведенных исследований полученные пористые нанокомпозиты PrFeO3-TiO2 могут рассматриваться в качестве перспективной основы фотокатализаторов для продвинутых
окислительных процессов очистки водных сред от органических загрязнителей.
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