SPECIAL ISSUE PAPER
Efficiency of Multi Walled Carbon Nanotubes for Removing Direct Blue 71 from Aqueous Solutions
 
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1
Research Center for Environmental Pollutants, Qom University of Medical Sciences, Qom, IRAN
2
Department of Environmental Health Engineering, Faculty of Health, Kashan University of Medical Sciences, Kashan, IRAN
3
Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, IRAN
4
Environmental Health Engineering Research Center, Department of Environmental Health, Kerman University of Medical Sciences, Kerman, IRAN
5
Department of Environmental Health Engineering, School of Public Health, Kerman University of Medical Sciences, Kerman, IRAN
6
Social Determinants of Health Research Center, Yasuj University of Medical Sciences, Yasuj, IRAN
7
Department of Environmental Health Engineering, School of Public Health, Shahroud University of Medical Sciences, Shahroud, IRAN
Online publish date: 2018-02-02
Publish date: 2018-02-02
 
Eurasian J Anal Chem 2018;13(3):em13
KEYWORDS:
ABSTRACT:
Dye wastewater produced from industrial activity is usually toxic, resistant to biodegradation and persistent in the environment. The aim of this study was to evaluate the efficiency of multiwalled carbon nanotubes (MWCNTs) for decolorization of Direct Blue 71 (DB71). In this experimental study, the effect of various variables including contact time, solution pH, adsorbent dose, and initial dye concentration was evaluated in a batch reactor. The adsorption and kinetic models were evaluated to explain the adsorbed dye and dynamic reaction. The results of this study showed that the efficiency of dye removal increased, as the contact time and adsorbent dose increased, but as pH and initial dye concentration increased, removal efficiency decreased. The maximum efficiency of Direct Blue 71 removal was observed at acidic solution (pH=3), contact time of 90 minutes, adsorbent dose of 0.6 g/l and initial dye concentration of 25 mg/l. The adsorption of direct blue 71 best fitted the Langmuir isotherm (R2=0.87) and pseudo first order kinetic equation (R2=0.99). According to the results obtained, multiwalled nanotubes was offered as an effective adsorbent for removing direct blue 71.
 
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