ВАКАНСИОННАЯ ИНЖЕНЕРИЯ MXENE ДЛЯ ОЧИСТКИ ВОДЫ ОТ ИОНОВ ТЯЖЕЛЫХ МЕТАЛЛОВ: МЕХАНИЗМ, СИНТЕЗ И ПРИМЕНЕНИЕ

Загрязнение водных ресурсов тяжелыми металлами стало одной из самых актуальных проблем нашего времени, поэтому необходимо изобрести новые и эффективные материалы для удаления тяжелых металлов из воды. Хотя ученые считают двумерные карбиды и нитриды переходных металлов (MXenes) хорошими адсорбентами, в исходных образцах этих материалов часто обнаруживаются естественные структурные дефекты. Основными препятствиями на пути к раскрытию полного потенциала материала являются плотная упаковка нанолистов и отсутствие активных центров на поверхности. В этой статье мы рассмотрим роль и механизм инженерии вакансий в удалении тяжелых металлов с помощью металлических (VM), углеродноазотных (VX) и поверхностных концевых вакансий (VTx). Путем целенаправленной модификации связей и электронной структуры атомов мы можем сделать так, чтобы вакансионные дефекты не только снижали адгезию слоев, но и действовали как активные термодинамические ловушки. Искусственные атомные дефекты приводят к перераспределению электронов в одном месте, и это явление значительно снижает энергию Гиббса связывания с тяжелыми металлами. Подобные искусственные дефекты активируют материал, увеличивая его адсорбционную способность в несколько раз (например, >400 мг/г для Pb²⁺) и приводя к спонтанному восстановлению тяжелых металлов, таких как Cr⁶⁺, в воде. В данной статье подробно рассматриваются новые технологии синтеза, позволяющие точно вводить структурные дефекты. В заключение предлагается стратегическое направление развития нового поколения материалов MXene для фильтров чистой воды, с учетом вопросов промышленного крупномасштабного производства и долговременного хранения.

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