کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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611689 | 880682 | 2008 | 12 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Structural features of polymer adsorbent LiChrolut EN and interfacial behavior of water and water/organic mixtures Structural features of polymer adsorbent LiChrolut EN and interfacial behavior of water and water/organic mixtures](/preview/png/611689.png)
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 (∼1500 m2/g) and pore volume (0.83 cm3/g) with a major contribution of narrow pores (R<10 nmR<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.
Structural features of polymer adsorbent LiChrolut EN differently influence the behavior of water and water/organic mixtures confined in micropores and mesopores.Figure optionsDownload as PowerPoint slide
Journal: Journal of Colloid and Interface Science - Volume 323, Issue 1, 1 July 2008, Pages 6–17