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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 25, 2013
Accepted May 6, 2013

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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The adsorption of malachite green (MG) as a cationic dye onto functionalized multi walled carbon nanotubes

Mohammad Shirmardi^{1 2} Amir Hossein Mahvi^{3 4†} Bayram Hashemzadeh⁵ Abolfazl Naeimabadi⁶ Ghasem Hassani¹ Mehdi Vosoughi Niri¹

¹Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ²Member of Student Research Committee of Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ³School of Public Health and Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran ⁴National Institute of Health Research, Tehran University of Medical Sciences, Tehran, Iran ⁵Department of Environmental Health, Khoy School of Nursing and Public Health, Urmia University of Medical Sciences, Urmia, Iran ⁶Department of Environmental Health, School of Public Health, North Khorasan University of Medical Sciences, Bojnourd, Iran

Korean Journal of Chemical Engineering, August 2013, 30(8), 1603-1608(6), 10.1007/s11814-013-0080-1

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Abstract

Synthetic dyes are widely used by several industries to color their products. The discharge of colored wastewater into the hydrosphere causes serious environmental problems. We used functionalized multi wall carbon nanotubes as an adsorbent for the adsorption of cationic dye, malachite green, from aqueous solution. Based on information provided by the Iranian Research Institute of Petroleum Industry, carbon nanotubes are produced using a chemical vapor deposition (CVD) technique. These as-received MWCNTs were functionalized by acid treatment. The remaining dye concentration was read by UV-visible absorption spectroscopy at maximum adsorption wavelength. The effect of different operational parameters such as contact time, pH of solution, adsorbent dose and initial dye concentration were studied. The results showed that by increasing of contact time, pH and adsorbent dose the removal of dye increased, but by increasing initial dye concentration, the removal efficiency decreased. Adsorption isotherms and kinetics behavior of f-MWCNTs for removal of malachite green was analyzed, and fitted to various existing models. The experimental data were well correlated with the Langmuir isotherm with a maximum adsorption capacity (qm) and regression coefficient (R2) of 142.85 mg/g and 0.997, respectively. The results of this study indicate that functionalized multi wall carbon nanotubes can be used as an effective adsorbent for the removal of dyes.

Keywords

Adsorption Carbon Nanotube Dye Isotherm Kinetic Study

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