title: Structural features of polymer adsorbent LiChrolut EN and interfacial behavior of water and water/organic mixtures.
abstract: The structural and adsorption characteristics of polymer adsorbent LiChrolut EN and the behavior of adsorbed water and water/organic mixtures were studied using adsorption, microcalorimetry, transmission and scanning electron microscopy, mass spectrometry, infrared spectroscopy, 1H NMR spectroscopy with layer-by-layer freezing-out of liquids (190-273 K), and thermally stimulated depolarization current method (90-265 K). This adsorbent is characterized by large specific surface area (approximately 1500 m2/g) and pore volume (0.83 cm3/g) with a major contribution of narrow pores (R<10 nm) of a complicated shape (long hysteresis loop is in nitrogen adsorption-desorption isotherm). The adsorbent includes aromatic and aliphatic structures and oxygen-containing functionalities and can effectively adsorb organics and water/organic mixtures. On co-adsorption of water and organics (dimethyl sulfoxide, chloroform, methane), there is a weak influence of one on another adsorbate due to their poor mixing in pores. Weakly polar chloroform displaces a fraction of water from narrow pores. These effects can explain high efficiency of the adsorbent in solid-phase extraction of organics from aqueous solutions. The influence of structural features of several carbon and polymer adsorbents on adsorbed nitrogen, water and water/organics is compared on the basis of the adsorption and 1H NMR data.
authors.affiliation: Institute of Surface Chemistry, 17 General Naumov Street, Kiev 03164, Ukraine. gun@voliacable.com
authors.forename: V M
authors.initials: VM
authors.lastname: Gun'ko
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authors.lastname: Turov
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authors.lastname: Zarko
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authors.initials: EV
authors.lastname: Goncharuk
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authors.lastname: Palyanytsya
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authors.lastname: Borodavka
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authors.lastname: Krupskaya
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authors.lastname: Leboda
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authors.lastname: Skubiszewska-Zieba
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authors.initials: VD
authors.lastname: Osovskii
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authors.initials: YG
authors.lastname: Ptushinskii
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authors.initials: AV
authors.lastname: Turov