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| Description
| - Thermal oxidation of Na-cholate hydrate at 300 A degrees C in air results in a carbonaceous solid (SC-30) nanomaterial bearing a steroid interior and a significant fraction of carboxylate sites. Electron Paramagnetic Resonance spectroscopy reveals that SC-30 bears a significant concentration of stable C-based radicals located at the interior of the steroid carbonaceous matrix. H-binding, determined by potentiometric acid-base titrations show that the SC-30 contains three types of H-binding sites. One type with pKa = 4.2 corresponds to surfacial metal-binding COOH groups. A second type of sites with pKa = 6.2 corresponds to COOH buried at the interior of the SC-30 carbon matrix, which are inactive in metal binding. A third type with pKa = 8.5-is also inactive in metal binding-originates from aggregated stacked-states like those observed for cholate in solution. The surfacial COO(-) carboxylate groups, confer the solid hydrophilic character, therefore it can be easily dispersed in water at high concentrations providing clear aqueous colloids. pH-edge metal uptake experiments and Surface Complexation Modelling show that SC-30 is an efficient heavy metal adsorbent in aqueous solution for Pb(2+) and Cu(2+) ions at pH 5-8. A structural/functional model is discussed based on the heterogeneous character of the SC-30 material.
- Thermal oxidation of Na-cholate hydrate at 300 A degrees C in air results in a carbonaceous solid (SC-30) nanomaterial bearing a steroid interior and a significant fraction of carboxylate sites. Electron Paramagnetic Resonance spectroscopy reveals that SC-30 bears a significant concentration of stable C-based radicals located at the interior of the steroid carbonaceous matrix. H-binding, determined by potentiometric acid-base titrations show that the SC-30 contains three types of H-binding sites. One type with pKa = 4.2 corresponds to surfacial metal-binding COOH groups. A second type of sites with pKa = 6.2 corresponds to COOH buried at the interior of the SC-30 carbon matrix, which are inactive in metal binding. A third type with pKa = 8.5-is also inactive in metal binding-originates from aggregated stacked-states like those observed for cholate in solution. The surfacial COO(-) carboxylate groups, confer the solid hydrophilic character, therefore it can be easily dispersed in water at high concentrations providing clear aqueous colloids. pH-edge metal uptake experiments and Surface Complexation Modelling show that SC-30 is an efficient heavy metal adsorbent in aqueous solution for Pb(2+) and Cu(2+) ions at pH 5-8. A structural/functional model is discussed based on the heterogeneous character of the SC-30 material. (en)
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| Title
| - A water-dispersible, carboxylate-rich carbonaceous solid: synthesis, heavy metal uptake and EPR study A
- A water-dispersible, carboxylate-rich carbonaceous solid: synthesis, heavy metal uptake and EPR study A (en)
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| skos:prefLabel
| - A water-dispersible, carboxylate-rich carbonaceous solid: synthesis, heavy metal uptake and EPR study A
- A water-dispersible, carboxylate-rich carbonaceous solid: synthesis, heavy metal uptake and EPR study A (en)
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| skos:notation
| - RIV/61989592:15310/12:33142309!RIV13-MSM-15310___
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| http://linked.open...avai/riv/aktivita
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| http://linked.open...avai/riv/aktivity
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| http://linked.open...iv/cisloPeriodika
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| http://linked.open...vai/riv/dodaniDat
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| http://linked.open...aciTvurceVysledku
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| http://linked.open.../riv/druhVysledku
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| http://linked.open...iv/duvernostUdaju
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| http://linked.open...titaPredkladatele
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| http://linked.open...dnocenehoVysledku
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| http://linked.open...ai/riv/idVysledku
| - RIV/61989592:15310/12:33142309
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| http://linked.open...riv/jazykVysledku
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| http://linked.open.../riv/klicovaSlova
| - study; EPR; uptake; metal; heavy; synthesis; solid; carbonaceous; carboxylate-rich; water-dispersible (en)
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| http://linked.open.../riv/klicoveSlovo
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| http://linked.open...odStatuVydavatele
| - US - Spojené státy americké
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| http://linked.open...ontrolniKodProRIV
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| http://linked.open...i/riv/nazevZdroje
| - Journal of Materials Science
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| http://linked.open...in/vavai/riv/obor
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| http://linked.open...ichTvurcuVysledku
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| http://linked.open...cetTvurcuVysledku
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| http://linked.open...vavai/riv/projekt
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| http://linked.open...UplatneniVysledku
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| http://linked.open...v/svazekPeriodika
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| http://linked.open...iv/tvurceVysledku
| - Zbořil, Radek
- Deligiannakis, Y.
- Stathi, P.
- Bourlinos, Ab
- Drosos, M.
- Tselepidou, A.
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| http://linked.open...ain/vavai/riv/wos
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| issn
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| number of pages
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| http://bibframe.org/vocab/doi
| - 10.1007/s10853-011-6148-6
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| http://localhost/t...ganizacniJednotka
| |
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