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Removal of Basic Red 5 on Calcined Kaolinite – Characterization and Adsorption Kinetics

  • Sultan Alam , Noor-ul Amin , F. K. Bangash and Mohammad Ali
Published/Copyright: May 1, 2013
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Abstract

Indigenous kaolin was collected from Swat district and then activated. The samples were characterized by BET surface area, FTIR, XRD, SEM, EDS, TGA/DTA, zeta potential and particle size analysis. Adsorption of basic red 5 on each sample was studied by adsorption kinetics at 20 °C, 30 °C and 40 °C. The residual concentration of the dye was determined by using UV–Vis spectrophotometer. The removal of basic red 5 from water solution was studied with respect to dye concentrations and equilibration time. Adsorption kinetics on kaolinite surface were analyzed by using parabolic diffusion, Elovich and Bangham models. Thermodynamic parameters like ΔE#, ΔH# and ΔS# were calculated from the adsorption kinetics data. The results show that the adsorption is a spontaneous and endothermic process. The negative value of entropy shows that the dye molecules take a proper position on the surface.

Kurzfassung

Kaolin wurde im heimlischen Swat-Distrit gesammelt und dann aktiviert. Die Proben wurden mittels der Bestimmung des BET-Oberflächenbereiches, der FTIR-Spektroskopie, der energiedispersiven Röntgenspektroskopie (EDS), der Röntgendiffraktion (XRD), der Rasterelektronenmikroskopie (REM), der thermischen Analyse (TGA/DTA), dem Zeta-Potential und der Partieklgrößenanalyse charakterisiert. Die Adsorption von Basic Red 5 wurde bei 20, 30 nd 40 °C über die Messung der kinetischen Adsorption untersucht. Die Restkonzentration des Basic Red 5 wurde mit einem UV–Vis-Spektrophotometer bestimmt. Die Entfernung von Basic Red 5 aus wässriger Lösung wurde in Abhängigkeit von der Farbstoffkonzentration und der Zeit für die Gleichgewichtseinstellung untersucht. Die Adsorptionskinetik an der Kaolinitoberfläche wurde mit der parabolischen Diffusion, der Elovich- und Bangham-Modelle analysiert. Aus den Daten der kinetischen Adsorption wurden thermodynamische Parameter wie ΔE#, ΔH# and ΔS# berechnet. Die Ergebnisse zeigen, dass die Adsorption ein spontaner und endothermer Vorgang ist. Die negative Entropie zeigt, dass die Farbstoffmoleküle einen ordentlichen Anteil an der Oberfläche einnehmen.


Correspondence address Dr. Sultan Alam, Assistant Professor, Department of Chemistry, University of Malakand, Chakdara, Dir, 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, regeneration of industrial spent carbon, characterization of adsorbents and surface chemistry at solid-liquid interface (clay sciences).

Dr. Noorul Amin is Assistant Professor in Analytical Chemistry AWK University, Mardan, Pakistan and currently working in the chemical activation of clay in cement mortar using different agents.

Mr. Mohammad Ali M. Phil research scholar and is working in the research group of Dr. Sultan Alam. His field of specialization is clay sciences and its correlation with surface chemistry.

Dr. Fazlullah Khan Bangash is Professor in Physical Chemistry at the University of Peshawar. His research interests include the characterization of adsorbents, water pollution and chemistry at solid-liquid interfaces.


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Received: 2013-03-16
Accepted: 2013-10-28
Published Online: 2013-05-01
Published in Print: 2014-01-20

© 2014, Carl Hanser Publisher, Munich

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