首页|Competitive adsorption characteristics of rhenium in single and binary (Re-Mo) systems using Purolite A170
Competitive adsorption characteristics of rhenium in single and binary (Re-Mo) systems using Purolite A170
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NSTL
Elsevier
<![CDATA[<ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="ab0005" xml:lang="en" view="all" class="author"><ce:section-title id="st0005">Abstract</ce:section-title><ce:abstract-sec id="as0005" view="all"><ce:simple-para id="sp0040" view="all">In this study adsorption of rhenium ions from single and bi-component solutions (Re-Mo) by Purolite A170 was studied experimentally and described by isotherm, kinetic and thermodynamic modeling. Considering coefficient of determination (R<ce:sup loc="post">2</ce:sup>) and values of root mean squared error (RMSE) for the multicomponent isotherms, the extended model of Freundlich isotherm was found to be successful. Moreover, fitting the time-dependent data into different mechanisms showed that the data comply well with the pseudo-second order model. Results from the binary systems demonstrated that the presence of the secondary metal ions in the system causes a decrease in the adsorption capacity of rhenium, which is mainly due to the competitive effects of metals for adsorption sites. Furthermore, evaluation of thermodynamic parameters showed that the reaction mechanisms are different for both systems; however, due to negative values of ΔH, in competitive condition the adsorption of rhenium becomes more feasible with increasing the temperature.</ce:simple-para></ce:abstract-sec></ce:abstract><ce:abstract xmlns:ce="http://www.elsevier.com/xml/common/dtd" xmlns="http://www.elsevier.com/xml/ja/dtd" id="ab0010" class="author-highlights" xml:lang="en" view="all"><ce:section-title id="st0010">Highlights</ce:section-title><ce:abstract-sec id="as0010" view="all"><ce:simple-para id="sp0045" view="all"><ce:list id="l0005"><ce:list-item id="li0005"><ce:label>?</ce:label><ce:para id="p0005" view="all">Uptake of perrhenate ions from single and binary (Re-Mo) systems was studied.</ce:para></ce:list-item><ce:list-item id="li1005"><ce:label>?</ce:label><ce:para id="p1005" view="all">The results were analyzed using equilibrium isotherms, kinetics and thermodynamic modeling.</ce:para></ce:list-item><ce:list-item id="li0010"><ce:label>?</ce:label><ce:para id="p0010" view="all">Extended Freundlich isotherm model was well fitted to binary adsorption data.</ce:para></ce:list-item><ce:list-item id="li0015"><ce:label>?</ce:label><ce:para id="p0015" view="all">Presence of competing ions adversely impacts on the process.</ce:para></ce:list-item><ce:list-item id="li0020"><ce:label>?</ce:label><ce:para id="p0020" view="all">Kinetics were controlled by the pseudo-second-order rate equation.</ce:para></ce:list-item><ce:list-item id="li0025"><ce:label>?</ce:label><ce:para id="p0025" view="all">Competitive sorption process of perrhenate ions was found exothermic and spontaneous.</ce:para></ce:list-item></ce:list></ce:simple-para></ce:abstract-sec></ce:abstract>]]>
RheniumPurolite A170Single and binary systemsMechanism
Mohammad Bagher Fathi、Bahram Rezai、Eskandar Keshavarz Alamdari
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Department of Mining and Metallurgical Engineering, Amirkabir University of Technology
NSTL
Elsevier
