Adsorption of fulvic acids from aqueous solutions by carbon nanotubes
Identifieur interne : 000633 ( Main/Exploration ); précédent : 000632; suivant : 000634Adsorption of fulvic acids from aqueous solutions by carbon nanotubes
Auteurs : Shu-Guang Wang [République populaire de Chine] ; Xian-Wei Liu [République populaire de Chine] ; Wen-Xin Gong [République populaire de Chine] ; Wei Nie [République populaire de Chine] ; Bao-Yu Gao [République populaire de Chine] ; Qin-Yan Yue [République populaire de Chine]Source :
- Journal of Chemical Technology & Biotechnology [ 0268-2575 ] ; 2007-08.
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Abstract
Carbon nanotubes (CNTs) were used as adsorbent to remove fulvic acids (FA) from aqueous solutions. The adsorption capacity of CNTs for FA can reach 24 mg g−1 at 5 °C and equilibrium concentration of 18 mg dm−3. The kinetic and thermodynamic parameters, such as rate of adsorption, standard free energy changes (ΔG0), standard enthalpy change (ΔH0) and standard entropy change (ΔS0), have been obtained. Acidic conditions (pH = 2–5) favor FA removal. An increase in the ionic strength or the addition of divalent cations increase the adsorption of FA dramatically (FA = 60 mg dm−3). An increase in the maximum adsorbed amount of FA was observed when treating FA in synthetic seawater. Desorption studies reveal that FA can be easily and quickly removed from CNTs by altering the pH values of the solution. Good adsorption capacity and quick desorption indicate that CNTs are a promising adsorbent to remove FA from aqueous solutions. Copyright © 2007 Society of Chemical Industry
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DOI: 10.1002/jctb.1708
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Chem. Technol. Biotechnol.</title><idno type="ISSN">0268-2575</idno><idno type="eISSN">1097-4660</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2007-08">2007-08</date><biblScope unit="volume">82</biblScope><biblScope unit="issue">8</biblScope><biblScope unit="page" from="698">698</biblScope><biblScope unit="page" to="704">704</biblScope></imprint><idno type="ISSN">0268-2575</idno></series><idno type="istex">C56C637608284B191DE7134F52C9A83F405DB5F5</idno><idno type="DOI">10.1002/jctb.1708</idno><idno type="ArticleID">JCTB1708</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0268-2575</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>adsorption</term><term>carbon nanotubes</term><term>desorption</term><term>fulvic acids</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Carbon nanotubes (CNTs) were used as adsorbent to remove fulvic acids (FA) from aqueous solutions. The adsorption capacity of CNTs for FA can reach 24 mg g−1 at 5 °C and equilibrium concentration of 18 mg dm−3. The kinetic and thermodynamic parameters, such as rate of adsorption, standard free energy changes (ΔG0), standard enthalpy change (ΔH0) and standard entropy change (ΔS0), have been obtained. Acidic conditions (pH = 2–5) favor FA removal. An increase in the ionic strength or the addition of divalent cations increase the adsorption of FA dramatically (FA = 60 mg dm−3). An increase in the maximum adsorbed amount of FA was observed when treating FA in synthetic seawater. Desorption studies reveal that FA can be easily and quickly removed from CNTs by altering the pH values of the solution. Good adsorption capacity and quick desorption indicate that CNTs are a promising adsorbent to remove FA from aqueous solutions. Copyright © 2007 Society of Chemical Industry</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Wang, Shu Uang" sort="Wang, Shu Uang" uniqKey="Wang S" first="Shu-Guang" last="Wang">Shu-Guang Wang</name></noRegion><name sortKey="Gao, Bao U" sort="Gao, Bao U" uniqKey="Gao B" first="Bao-Yu" last="Gao">Bao-Yu Gao</name><name sortKey="Gong, Wen In" sort="Gong, Wen In" uniqKey="Gong W" first="Wen-Xin" last="Gong">Wen-Xin Gong</name><name sortKey="Liu, Xian Ei" sort="Liu, Xian Ei" uniqKey="Liu X" first="Xian-Wei" last="Liu">Xian-Wei Liu</name><name sortKey="Liu, Xian Ei" sort="Liu, Xian Ei" uniqKey="Liu X" first="Xian-Wei" last="Liu">Xian-Wei Liu</name><name sortKey="Nie, Wei" sort="Nie, Wei" uniqKey="Nie W" first="Wei" last="Nie">Wei Nie</name><name sortKey="Yue, Qin An" sort="Yue, Qin An" uniqKey="Yue Q" first="Qin-Yan" last="Yue">Qin-Yan Yue</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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