Competitive adsorption of gaseous aromatic hydrocarbons in a binary mixture on nanoporous covalent organic polymers at various partial pressures
| Autor: | Hee Nam Song, Azmatullah Khan, Ki-Hyun Kim, Wha-Seung Ahn, Jan E. Szulejko, Jo Chun Kim, Hubdar Ali Maitlo |
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| Rok vydání: | 2018 |
| Předmět: |
Langmuir
Sorbent Polymers Partial Pressure Inorganic chemistry 010501 environmental sciences 01 natural sciences Biochemistry 03 medical and health sciences chemistry.chemical_compound Nanopores 0302 clinical medicine Adsorption Freundlich equation 030212 general & internal medicine Benzene 0105 earth and related environmental sciences General Environmental Science Sorption Partial pressure Toluene Hydrocarbons chemistry Gases |
| Zdroj: | Environmental research. 173 |
| ISSN: | 1096-0953 |
| Popis: | Covalent-organic polymers (COPs) are recognized for their great potential for treating diverse pollutants via adsorption. In this study, the sorption behavior of benzene and toluene was investigated both individually and in a binary mixture against two types of COPs possessing different –NH2 functionalities. Namely, the potential of COPs was tested against benzene and toluene in a low inlet partial pressure range (0.5–20 Pa) using carbonyl-incorporated aromatic polymer (CBAP)-1-based diethylenediamine (EDA) [CD] and ethylenetriamine (DETA) [CE]. The maximum adsorption capacity and breakthrough values of both COPs showed dynamic changes with increases in the partial pressures of benzene and toluene. The maximum adsorption capacities (Amax) of benzene (as the sole component in N2 under atmospheric conditions) on CD and CE were in the range of 24–36 and 33–75 mg g−1, respectively. In contrast, with benzene and toluene in a binary mixture, the benzene Amax decreased more than two-fold (range of 2.7–15 and 6–39 mg g−1, respectively) due to competition with toluene for sorption sites. In contrast, the toluene Amax values remained consistent, reflecting its competitive dominance over benzene. The adsorption behavior of the targeted compounds (i.e., benzene and toluene) was explained by fitting the adsorption data by diverse isotherm models (e.g., Langmuir, Freundlich, Elovich, and Dubinin-Radushkevich). The current research would be helpful for acquiring a better understanding of the factors affecting competitive adsorption between different VOCs in relation to a given sorbent and across varying partial pressures. |
| Databáze: | OpenAIRE |
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