Structural features of polymer adsorbent LiChrolut EN and interfacial behavior of water and water/organic mixtures |
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Authors: | Gun'ko V M Turov V V Zarko V I Nychiporuk Y M Goncharuk E V Pakhlov E M Yurchenko G R Kulik T V Palyanytsya B B Borodavka T V Krupskaya T V Leboda R Skubiszewska-Zieba J Osovskii V D Ptushinskii Y G Turov A V |
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Institution: | Institute of Surface Chemistry, 17 General Naumov Street, Kiev 03164, Ukraine. gun@voliacable.com |
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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. |
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