LrgpV1, Main, Exploration, bibRecord, 001345

Fate of coagulant species and conformational effects during the aggregation of a model of a humic substance with Al13 polycations

Identifieur interne : 001345 ( Main/Exploration ); précédent : 001344; suivant : 001346

Fate of coagulant species and conformational effects during the aggregation of a model of a humic substance with Al13 polycations

Auteurs : V. Kazpard [France] ; B. S. Lartiges [France] ; C. Frochot [France] ; J. B. D'Espinose De La Caillerie [France] ; M. L. Viriot [France] ; J. M. Portal [France] ; T. Görner [France] ; J. L. Bersillon [France]

Source :

Water research : (Oxford) [ 0043-1354 ] ; 2006.

RBID : Pascal:06-0325873

Descripteurs français

Pascal (Inist)
- Floculant, Modélisation, Oxydation, Angle magique, Régime permanent, Spectrométrie fluorescence, Pyrène, Mobilité électrophorétique, Polarité, Fluorescence, Composé hydrophobe, Floculation, Composé aromatique polycyclique, Epuration physicochimique, Hydrocarbure.
Wicri :
- topic : Hydrocarbure.

English descriptors

KwdEn :
- Electrophoretic mobility, Flocculation, Flocculation reagent, Fluorescence, Fluorescence spectrometry, Hydrocarbon, Hydrophobic compound, Magic angle, Modeling, Oxidation, Physicochemical purification, Polarity, Polycyclic aromatic compound, Pyrene, Steady state.

Abstract

A model of a humic substance (MHS) obtained from auto-oxidation of catechol and glycine, was aggregated at pH 6 and 8 with Al₁₃ polycations. The fate of Al₁₃ coagulant species upon association with MHS functional groups was studied using solid state ²⁷Al Magic-angle spinning (MAS) NMR and CP-MAS ¹³C NMR. Electrophoretic measurements and steady-state fluorescence spectroscopy with pyrene as a fluoroprobe, were combined to investigate structural re-organization of humic material with aluminum concentration. MAS ²⁷Al NMR revealed that the coagulant species are Al₁₃ polycations or oligomers of Al₁₃ units at both pHs. CP MAS ¹³C spectra indicated that, at low Al concentration, hydrolyzed aluminum species bind selectively to carboxylic groups at pH 6 and to phenolic moieties at pH 8. At higher coagulant concentrations, the remaining functional groups also interact with hydrolyzed Al to yield similar CP MAS ¹³C spectra in the optimum concentration range. Negative values of electrophoretic mobility were obtained at optimum coagulant concentrations even though an overall charge balance was achieved between MHS anionic charge and Alia cationic charge at pH 6. The polarity-sensitive fluorescence of pyrene revealed that the interaction of Al₁₃ coagulant species with MHS functional groups induces the formation of intramolecular hydrophobic microenvironments. Such structural changes were reversed upon further addition of Al₁₃ polycations.

Affiliations:

France
Grand Est, Lorraine (région), Île-de-France
Nancy, Paris, Vandoeuure

Links toward previous steps (curation, corpus...)

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Le document en format XML

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<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Département de Chimie Physique des Réactions (CDPR-GRAPP), UMR 7630 ENSIC-CNRS-INPL, 1 rue Granduille, BP 451</s1>
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<placeName><region type="region" nuts="2">Grand Est</region>
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<author><name sortKey="D Espinose De La Caillerie, J B" sort="D Espinose De La Caillerie, J B" uniqKey="D Espinose De La Caillerie J" first="J. B." last="D'Espinose De La Caillerie">J. B. D'Espinose De La Caillerie</name>
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<country>France</country>
<placeName><region type="region" nuts="2">Île-de-France</region>
<settlement type="city">Paris</settlement>
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</author>
<author><name sortKey="Viriot, M L" sort="Viriot, M L" uniqKey="Viriot M" first="M. L." last="Viriot">M. L. Viriot</name>
<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Département de Chimie Physique des Réactions (CDPR-GRAPP), UMR 7630 ENSIC-CNRS-INPL, 1 rue Granduille, BP 451</s1>
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<country>France</country>
<placeName><region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
<settlement type="city">Nancy</settlement>
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<author><name sortKey="Portal, J M" sort="Portal, J M" uniqKey="Portal J" first="J. M." last="Portal">J. M. Portal</name>
<affiliation wicri:level="3"><inist:fA14 i1="04"><s1>CRPG-CNRS, 15 Rue Notre Dame des Pauvres, BP 5</s1>
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<s3>FRA</s3>
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</author>
<author><name sortKey="Gorner, T" sort="Gorner, T" uniqKey="Gorner T" first="T." last="Görner">T. Görner</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Uniuersity of Nancy-LEM-ENSG/INPL-CNRS, Pôle de l'Eau 15 Avenue du Charmois, BP 40</s1>
<s2>54501 Vandoeuure</s2>
<s3>FRA</s3>
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<placeName><region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
<settlement type="city">Vandoeuure</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Bersillon, J L" sort="Bersillon, J L" uniqKey="Bersillon J" first="J. L." last="Bersillon">J. L. Bersillon</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Uniuersity of Nancy-LEM-ENSG/INPL-CNRS, Pôle de l'Eau 15 Avenue du Charmois, BP 40</s1>
<s2>54501 Vandoeuure</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
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<sZ>7 aut.</sZ>
<sZ>8 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Grand Est</region>
<region type="old region" nuts="2">Lorraine (région)</region>
<settlement type="city">Vandoeuure</settlement>
</placeName>
</affiliation>
</author>
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<series><title level="j" type="main">Water research : (Oxford)</title>
<title level="j" type="abbreviated">Water res. : (Oxf.)</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Electrophoretic mobility</term>
<term>Flocculation</term>
<term>Flocculation reagent</term>
<term>Fluorescence</term>
<term>Fluorescence spectrometry</term>
<term>Hydrocarbon</term>
<term>Hydrophobic compound</term>
<term>Magic angle</term>
<term>Modeling</term>
<term>Oxidation</term>
<term>Physicochemical purification</term>
<term>Polarity</term>
<term>Polycyclic aromatic compound</term>
<term>Pyrene</term>
<term>Steady state</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Floculant</term>
<term>Modélisation</term>
<term>Oxydation</term>
<term>Angle magique</term>
<term>Régime permanent</term>
<term>Spectrométrie fluorescence</term>
<term>Pyrène</term>
<term>Mobilité électrophorétique</term>
<term>Polarité</term>
<term>Fluorescence</term>
<term>Composé hydrophobe</term>
<term>Floculation</term>
<term>Composé aromatique polycyclique</term>
<term>Epuration physicochimique</term>
<term>Hydrocarbure</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Hydrocarbure</term>
</keywords>
</textClass>
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</teiHeader>
<front><div type="abstract" xml:lang="en">A model of a humic substance (MHS) obtained from auto-oxidation of catechol and glycine, was aggregated at pH 6 and 8 with Al<sub>13</sub>
 polycations. The fate of Al<sub>13</sub>
 coagulant species upon association with MHS functional groups was studied using solid state <sup>27</sup>
Al Magic-angle spinning (MAS) NMR and CP-MAS <sup>13</sup>
C NMR. Electrophoretic measurements and steady-state fluorescence spectroscopy with pyrene as a fluoroprobe, were combined to investigate structural re-organization of humic material with aluminum concentration. MAS <sup>27</sup>
Al NMR revealed that the coagulant species are Al<sub>13</sub>
 polycations or oligomers of Al<sub>13</sub>
 units at both pHs. CP MAS <sup>13</sup>
C spectra indicated that, at low Al concentration, hydrolyzed aluminum species bind selectively to carboxylic groups at pH 6 and to phenolic moieties at pH 8. At higher coagulant concentrations, the remaining functional groups also interact with hydrolyzed Al to yield similar CP MAS <sup>13</sup>
C spectra in the optimum concentration range. Negative values of electrophoretic mobility were obtained at optimum coagulant concentrations even though an overall charge balance was achieved between MHS anionic charge and Alia cationic charge at pH 6. The polarity-sensitive fluorescence of pyrene revealed that the interaction of Al<sub>13</sub>
 coagulant species with MHS functional groups induces the formation of intramolecular hydrophobic microenvironments. Such structural changes were reversed upon further addition of Al<sub>13</sub>
 polycations.</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
</country>
<region><li>Grand Est</li>
<li>Lorraine (région)</li>
<li>Île-de-France</li>
</region>
<settlement><li>Nancy</li>
<li>Paris</li>
<li>Vandoeuure</li>
</settlement>
</list>
<tree><country name="France"><region name="Grand Est"><name sortKey="Kazpard, V" sort="Kazpard, V" uniqKey="Kazpard V" first="V." last="Kazpard">V. Kazpard</name>
</region>
<name sortKey="Bersillon, J L" sort="Bersillon, J L" uniqKey="Bersillon J" first="J. L." last="Bersillon">J. L. Bersillon</name>
<name sortKey="D Espinose De La Caillerie, J B" sort="D Espinose De La Caillerie, J B" uniqKey="D Espinose De La Caillerie J" first="J. B." last="D'Espinose De La Caillerie">J. B. D'Espinose De La Caillerie</name>
<name sortKey="Frochot, C" sort="Frochot, C" uniqKey="Frochot C" first="C." last="Frochot">C. Frochot</name>
<name sortKey="Gorner, T" sort="Gorner, T" uniqKey="Gorner T" first="T." last="Görner">T. Görner</name>
<name sortKey="Lartiges, B S" sort="Lartiges, B S" uniqKey="Lartiges B" first="B. S." last="Lartiges">B. S. Lartiges</name>
<name sortKey="Portal, J M" sort="Portal, J M" uniqKey="Portal J" first="J. M." last="Portal">J. M. Portal</name>
<name sortKey="Viriot, M L" sort="Viriot, M L" uniqKey="Viriot M" first="M. L." last="Viriot">M. L. Viriot</name>
</country>
</tree>
</affiliations>
</record>

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Fate of coagulant species and conformational effects during the aggregation of a model of a humic substance with Al13 polycations

Fate of coagulant species and conformational effects during the aggregation of a model of a humic substance with Al13 polycations

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri