Фотосенсибилизация активных форм кислорода наночастицами диоксида титана, декорированными квантовыми точками сульфида серебра
Аннотация
В настоящее время большой интерес вызывает разработка способов сенсибилизации к видимой и ИК области спектра систем фотокаталитического продуцирования активных форм кислорода на основе наночастиц диоксида титана. Целью данной работы являлось установление закономерностей фотогенерации активных форм кислорода при формировании наногетеросистем наночастица TiO2 – квантовая точка Ag2S под действием излучения из видимой и ближней ИК областей спектра.
В работе проведен анализ фотокаталитических свойств наночастиц анатаза размером 10–15 нм, декорированных коллоидными квантовыми точками Ag2S средним размером 2.5 нм, ассивированными тиогликолевой и 2-меркаптопропионовой кислотами. При помощи селективных сенсорных красителей произведена оценка эффективности сенсибилизации различных активных форм кислорода изученными фотокатализаторами в условиях возбуждения в УФ и видимой области. Показано, что декорирование наночастиц TiO2 квантовыми точками приводит к увеличению эффективности продуцирования гидроксильного радикала, супероксид аниона и перекиси водорода
системой при фотовозбуждении излучением из области поглощения TiO2 (УФ диапазон). Обнаружена сенсибилизация продуцирования активных форм кислорода наносистемами при возбуждении излучением из видимой области спектра (вне полосы собственного поглощения TiO2). Обнаружено увеличение эффективности продуцирования активных форм кислорода (до 1.5 раз) при замене пассиватора квантовых точек Ag2S с тиогликолевой кислоты на 2-меркаптопропионовую. На основании полученных данных предложена схема фотопроцессов в системе.
Скачивания
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