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Equilibrium and Thermodynamics Studies for Decolorization of Reactive Black 5 (Rb5) by Adsorption Onto Mwcnts Publisher



Bazrafshan E1 ; Kord Mostafapour F1 ; Rahdar S1 ; Mahvi AH2, 3, 4
Authors
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Authors Affiliations
  1. 1. Health Promotion Research Center, Zahedan University of Medical Sciences, Zahedan, Iran
  2. 2. School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Center for Solid Waste Research, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran

Source: Desalination and Water Treatment Published:2015


Abstract

At present study, multi-walled carbon nanotubes were used as an adsorbent for Reactive Black 5 (RB5) removal from aqueous solutions. The influence of important parameters including initial pH, concentration of dye, contact time, adsorbent dosage, and temperature has been investigated in order to find the optimum adsorption conditions. The results show that all the parameters have a strong effect on the adsorption of RB5 onto adsorbent. Adsorption kinetics was best described by the pseudo-second-order model. In addition, equilibrium data were better represented by Freundlich isotherm among Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich equilibrium isotherm models. The negative values of free-energy change confirmed the feasibility of the process and the spontaneous nature of adsorption. Furthermore, from the magnitude of ΔH, the process was found to be endothermic physisorption. © 2014 Balaban Desalination Publications. All rights reserved.
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