Исследование сорбции ароматических соединений из водных растворов терморасширенным графитом
Аннотация
Представлены результаты исследования возможности использования терморасширенного графита на основе нитрата графита, соинтеркалированного этилформиатом и уксусной кислотой, для очистки воды от ароматических соединений. Возможность применения углеродных сорбентов, в частности терморасширенного графита, для очистки воды от ароматических соединений непосредственно связана с исследованием их сорбционной способности. Терморасширенный графит (ТРГ), используемый в качестве сорбционного материала, был синтезирован и изучен нами ранее. Он представляет собой высокопористый материал с высокой способностью к регенерации, малым расходом и относительно низкой стоимостью. ТРГ является химически инертным, термостойким, имеет большую удельную поверхность, а также проявляет хорошую сорбционную способность по отношению к различным токсикантам. Для проведения экспериментов в качестве адсорбатов использовали моноароматические углеводороды: бензол и фенол. Исследования статической сорбционной емкости проводили при помощи метода УФ спектроскопии при постоянной температуре 20 ºС. На основе экспериментальных значений сорбционной емкости были получены изотермы адсорбции, которые можно отнести к классу S по классификации Ч. Гильса. Определены значения максимальной сорбционной емкости ТРГ относительно бензола и фенола в исследуемом диапазоне концентраций токсикантов – 0,25 и 6,95 г/г сорбента, соответственно.
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