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Adsorptive Removal of Ni2+ from Aqueous Solution by Low Cost Cellulosic Adsorbent-Adsorption Kinetics and Isotherm Study

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Veröffentlicht/Copyright: 22. August 2013
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Abstract

Adsorptive removal of Ni2+ from aqueous solution by low cost cellulosic adsorbent was investigated with respect to adsorption kinetics and adsorption isotherm. Adsorbent was characterized by BET surface area, SEM, EDX, FTIR and Zeta potential technique and reported earlier. The surfaces contain carbonyl and hydroxyl functional groups, which act as binding sites for Ni2+ ion. Adsorption kinetics of Ni2+ was tested by first order, Elovich, parabolic diffusion and Bangham kinetic equations. Thermodynamic parameters like ΔH, ΔS and ΔG were calculated from the kinetic data. The rate of adsorption was high at high adsorption temperature. Positive values of ΔS reflect some structural exchange among the active site of the adsorbent and metal ion. Freundlich, Langmuir, Temkin isotherms and distribution coefficient were found fit to the adsorption isotherm data.

Kurzfassung

Es wurde die Entfernung von Ni2+ aus wässriger Lösung durch Adsorption an preiswerten Celluloseadsorbentien hinsichtlich der Adsorptionskinetik und Adosptionsisothermen untersucht. Das Adsorbens wurde mit Hilfe der BET-Oberfläche, SEM, EDX, FT-IR und des Zetapotentials charakterisiert, wie schon berichtet wurde. An der Oberfläche sind funktionelle Carbonyl- und Hydroxylgruppen vorhanden, die als Bindungsstellen für das Ni2+-Ionen dienen. Die Adsorptionskinetik der Ni2+-Ionen wurde mit folgenden Modellgleichungen getestet: Modell erster Ordnung, Elovich, Banham- und dem parabolischen Diffusionsmodell. Die thermodynamischen Parameter ΔH, ΔS und ΔG wurden aus den kinetischen Daten bestimmt. Die Adsorptionsgeschwindigkeit war bei hohen Adsorptionstemperaturen hoch. Die positiven ΔS-Werte weisen auf einen Strukturaustausch zwischen dem Adsorbens und dem Metallion auf den aktiven Plätzen hin. Die Adsorptionsdaten wurden an die Freundlich-, Langmuir- und Temkin-Isothermen angepasst und die Verteilungskoeffizienten daraus berechnet.


1 Correspondence to Prof. Dr. Sultan Alam, Department of Chemistry, University of Malakand, Chakdara, Pakistan. E-Mail:

Dr. Sultan Alam is Assistant Professor in Physical Chemistry, University of Malakand, at Chakdara, Dir (L), Pakistan. His research interest includes, conversion of low cost precursors into activated carbon like agricultural waste material, fast growing wood and animal bones, regeneration of industrial spent carbon, characterization of adsorbents by surface area (BET, DR, BJH, and Langmuir), pore size distribution, FTIR, XRD, SEM and EDS, surface chemistry at solid-liquid interface i. e. Activated carbon, Clays and Soil, removal of organic and in-organic pollutants from aqueous solutions by active adsorbents like activated carbon, clays and soil.

Dr. Noorul Amin is Assistant Professor in AWK University, Mardan, Pakistan and currently working in the field of environmental chemistry.

Najeeb-ur-Rehman is Assistant Professor in Physical Chemistry at the University of Malakant, Khyber Pakhtunkhwa, Pakistan. He graduated at the University of Peshawar. His fields of interests are surface chemistry and interaction between water soluble polymers and charged surfactants.

Mr. Azmat Ullah is lecturer in Chemistry, Govt Post Graduate College Daggar Buner and is working in the research group of Dr. Sultan Alam. His field of specialization is surface chemistry. His research interest includes, conversion of low cost precursors into activated carbon like agricultural waste material, fast growing wood and animal bones, regeneration of industrial spent carbon, characterization of adsorbents by surface area (BET, DR, BJH, and Langmuir), pore size distribution, FTIR, XRD, SEM and EDS, surface chemistry at solid-liquid interface i. e. Activated carbon, Clays and Soil, removal of organic and in-organic pollutants from aqueous solutions by active adsorbents like activated carbon, clays and soil.


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Received: 2012-1-9
Revised: 2012-4-26
Published Online: 2013-08-22
Published in Print: 2013-03-15

© 2013, Carl Hanser Publisher, Munich

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