ДЕСТРУКЦИЯ ВОДНЫХ РАСТВОРОВ 2,4-ДИХЛОРФЕНОЛА В ПЛАЗМЕННО-КАТАЛИТИЧЕСКОМ РЕАКТОРЕ БАРЬЕРНОГО РАЗРЯДА
Аннотация
В работе были исследованы процессы деструкции водных растворов 2,4-дихлорфенола в диэлектрическом барьерном разряде атмосферного давления в среде кислорода, с находящимся внутри реактора катализатором Pt/Al2O3. Экспериментально показано, что 2,4-дихлорфенол разрушается в плазме достаточно эффективно (степень деструкции достигает не менее 70 %). В работе были оценены кинетические параметры и определены основные промежуточные и конечные продукты процесса разложения 2,4-дихлорфенола под действием активных частиц плазмы в присутствии катализатора. Деструкция исходного соединения описывается кинетическим уравнением первого порядка по концентрации 2,4-дихлорфенола. Эффективная константа скорости слабо зависит от условий эксперимента и составляет 0,43 с-1. Состав продуктов деструкции был изучен методом газовой хроматографии, а также флуоресцентным, спектрофотометрическим и потенциометрическим методами. В качестве конечных продуктов деструкции выявлены Cl- в жидкой фазе, а также СО2 в газовой фазе, а промежуточными продуктами деструкции являются карбоновые кислоты и альдегиды, но их концентрации невелики относительно диоксида углерода. Молекулярный хлор в газовой фазе не обнаружен. Установлено, что озон не вносит существенного вклада в процесс окислительной деструкции 2,4-дихлорфенола, т.е. в процессе окисления основную роль играют другие активные частицы плазмы, например, гидроксильные радикалы и атомарный кислород.
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