Removal of cadmium(II) ions from aqueous solution using Ni (15 wt.%)-doped α-Fe2O3 nanocrystals: equilibrium, thermodynamic, and kinetic studies.
Identifieur interne : 000044 ( Main/Exploration ); précédent : 000043; suivant : 000045Removal of cadmium(II) ions from aqueous solution using Ni (15 wt.%)-doped α-Fe2O3 nanocrystals: equilibrium, thermodynamic, and kinetic studies.
Auteurs : Mohamed Ouldm'Hamed [Arabie saoudite] ; L. Khezami [Arabie saoudite] ; Abdulrahman G. Alshammari [Arabie saoudite] ; S M Ould-Mame [Mauritanie] ; I. Ghiloufi [Tunisie] ; O M Lemine [Arabie saoudite]Source :
- Water science and technology : a journal of the International Association on Water Pollution Research [ 0273-1223 ] ; 2015.
English descriptors
- KwdEn :
- MESH :
- chemical , analysis : Waste Water.
- chemical , chemistry : Cadmium, Ferric Compounds, Nickel.
- chemistry : Metal Nanoparticles, Nanoparticles.
- methods : Waste Disposal, Fluid.
- Hydrogen-Ion Concentration, Models, Theoretical, Temperature.
Abstract
The present publication investigates the performance of nanocrystalline Ni (15 wt.%)-doped α-Fe2O3 as an effective nanomaterial for the removal of Cd(II) ions from aqueous solutions. The nanocrystalline Ni-doped α-Fe2O3 powders were prepared by mechanical alloying, and characterized by X-ray diffraction and a vibrating sample magnetometer. Batch-mode experiments were realized to determine the adsorption equilibrium, kinetics, and thermodynamic parameters of toxic heavy metal ions by Ni (15 wt.%)-doped α-Fe2O3. The adsorption isotherms data were found to be in good agreement with the Langmuir model. The adsorption capacity of Cd(II) ion reached a maximum value of about 90.91 mg g(-1) at 328 K and pH 7. The adsorption process kinetics was found to comply with pseudo-second-order rate law. Thermodynamic parameters related to the adsorption reaction, free energy change, enthalpy change and entropy change, were evaluated. The found values of free energy and enthalpy revealed a spontaneous endothermic adsorption-process. Moreover, the positive entropy suggests an increase of randomness during the process of heavy metal removal at the adsorbent-solution interface.
DOI: 10.2166/wst.2015.245
PubMed: 26247760
Affiliations:
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Ghiloufi</name><affiliation wicri:level="1"><nlm:affiliation>Department of Physics, College of Sciences, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia; Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Faculty of Sciences, Gabes University, Gabes, Tunisia.</nlm:affiliation><country xml:lang="fr">Tunisie</country><wicri:regionArea>Department of Physics, College of Sciences, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia; Laboratory of Physics of Materials and Nanomaterials Applied at Environment (LaPhyMNE), Faculty of Sciences, Gabes University, Gabes</wicri:regionArea><wicri:noRegion>Gabes</wicri:noRegion></affiliation></author><author><name sortKey="Lemine, O M" sort="Lemine, O M" uniqKey="Lemine O" first="O M" last="Lemine">O M Lemine</name><affiliation wicri:level="1"><nlm:affiliation>Department of Physics, College of Sciences, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia.</nlm:affiliation><country xml:lang="fr">Arabie saoudite</country><wicri:regionArea>Department of Physics, College of Sciences, Al Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh</wicri:regionArea><wicri:noRegion>Riyadh</wicri:noRegion></affiliation></author></analytic><series><title level="j">Water science and technology : a journal of the International Association on Water Pollution Research</title><idno type="ISSN">0273-1223</idno><imprint><date when="2015" type="published">2015</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cadmium (chemistry)</term><term>Ferric Compounds (chemistry)</term><term>Hydrogen-Ion Concentration</term><term>Metal Nanoparticles (chemistry)</term><term>Models, Theoretical</term><term>Nanoparticles (chemistry)</term><term>Nickel (chemistry)</term><term>Temperature</term><term>Waste Disposal, Fluid (methods)</term><term>Waste Water (analysis)</term></keywords><keywords scheme="MESH" type="chemical" qualifier="analysis" xml:lang="en"><term>Waste Water</term></keywords><keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Cadmium</term><term>Ferric Compounds</term><term>Nickel</term></keywords><keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Metal Nanoparticles</term><term>Nanoparticles</term></keywords><keywords scheme="MESH" qualifier="methods" xml:lang="en"><term>Waste Disposal, Fluid</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Hydrogen-Ion Concentration</term><term>Models, Theoretical</term><term>Temperature</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The present publication investigates the performance of nanocrystalline Ni (15 wt.%)-doped α-Fe2O3 as an effective nanomaterial for the removal of Cd(II) ions from aqueous solutions. The nanocrystalline Ni-doped α-Fe2O3 powders were prepared by mechanical alloying, and characterized by X-ray diffraction and a vibrating sample magnetometer. Batch-mode experiments were realized to determine the adsorption equilibrium, kinetics, and thermodynamic parameters of toxic heavy metal ions by Ni (15 wt.%)-doped α-Fe2O3. The adsorption isotherms data were found to be in good agreement with the Langmuir model. The adsorption capacity of Cd(II) ion reached a maximum value of about 90.91 mg g(-1) at 328 K and pH 7. The adsorption process kinetics was found to comply with pseudo-second-order rate law. Thermodynamic parameters related to the adsorption reaction, free energy change, enthalpy change and entropy change, were evaluated. The found values of free energy and enthalpy revealed a spontaneous endothermic adsorption-process. Moreover, the positive entropy suggests an increase of randomness during the process of heavy metal removal at the adsorbent-solution interface.</div></front></TEI><affiliations><list><country><li>Arabie saoudite</li><li>Mauritanie</li><li>Tunisie</li></country></list><tree><country name="Arabie saoudite"><noRegion><name sortKey="Ouldm Hamed, Mohamed" sort="Ouldm Hamed, Mohamed" uniqKey="Ouldm Hamed M" first="Mohamed" last="Ouldm'Hamed">Mohamed Ouldm'Hamed</name></noRegion><name sortKey="Alshammari, Abdulrahman G" sort="Alshammari, Abdulrahman G" uniqKey="Alshammari A" first="Abdulrahman G" last="Alshammari">Abdulrahman G. Alshammari</name><name sortKey="Khezami, L" sort="Khezami, L" uniqKey="Khezami L" first="L" last="Khezami">L. Khezami</name><name sortKey="Lemine, O M" sort="Lemine, O M" uniqKey="Lemine O" first="O M" last="Lemine">O M Lemine</name></country><country name="Mauritanie"><noRegion><name sortKey="Ould Mame, S M" sort="Ould Mame, S M" uniqKey="Ould Mame S" first="S M" last="Ould-Mame">S M Ould-Mame</name></noRegion></country><country name="Tunisie"><noRegion><name sortKey="Ghiloufi, I" sort="Ghiloufi, I" uniqKey="Ghiloufi I" first="I" last="Ghiloufi">I. Ghiloufi</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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