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Study of sorption of aromatic compounds from aqueous solutions by thermally expanded graphite

Исследование сорбции ароматических соединений из водных растворов терморасширенным графитом

Study of sorption of aromatic compounds from aqueous solutions by thermally expanded graphite

Abstract

Представлены результаты исследования возможности использования в качестве сорбента для очистки воды от ароматических соединений терморасширенного графита (ТРГ) на основе нитрата графита, соинтеркалированного этилформиатом и уксусной кислотой. ТРГ, синтезированный и изученный ранее, представляет собой термостойкий, химически инертный высокопористый материал с большой удельной поверхностью, высокой способностью к регенерации, малой степенью расходования и относительно низкой стоимостью. Для проведения экспериментов в качестве адсорбатов использовали моноароматические углеводороды: бензол и фенол. Исследования статической сорбционной емкости ТРГ проводили при помощи метода УФ-спектроскопии при постоянной температуре 20°С. 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. Результаты показывают, что ТРГ проявляет хорошую сорбционную способность по отношению к исследуемым ароматическим соединениям и может быть рекомендован для очистки сточных вод и водоемов от загрязняющих веществ ароматического типа. The paper presents results of studying a possibility of using thermally expanded graphite (TEG) derived from graphite nitrate co-intercalated with ethyl formate and acetic acid, as an adsorbent for water purification from aromatic compounds. The TEG synthesized and studied previously is a heat-resistant, chemically inert highly porous material with a significant specific surface value, high regeneration ability, low consumption rate and a relatively low cost. Monoaromatic hydrocarbons, i.e. benzene and phenol are used as adsorbates for the experiments as potentially toxic compounds. Studies of TEG static sorption capacity have been carried out using UV spectroscopy technique at a constant temperature of 20°C. Adsorption isotherms have been obtained from the experimental values of sorption capacity. The isotherms can be attributed to class S according to C.H. Giles classification. The values of the maximum sorption capacity of TEG relative to benzene and phenol are calculated as 0.25 and 6.95 g/g of sorbent, respectively, in the studied concentration range of the toxicants. The results show that TEG exhibits a good sorption capacity with respect to the aromatic compounds studied and thus can be recommended for the removal of aromatic pollutants from wastewater and water bodies.

Keywords

очистка воды, УФ спектроскопия, сорбция, ароматические соединения, изотермы адсорбции, терморасширенный графит

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
1
Average
Average
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