Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 206, Issue -, Pages 151-158Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molliq.2015.02.007
Keywords
Multi-walled carbon nanotubes (MWCNTs); Adsorption; Carboxylate group; Malachite green (MG); Removal of dye
Funding
- Islamic Azad University
- Department of Science and Technology, New Delhi, India under project grant DST/INT/South Africa [P-03/2014]
- Deanship of Scientific Research grant for the Research Group at King Saud University [RGP-VPP-292]
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Carboxylate group functionalized multi-walled carbon nanotubes (MWCNT-COOH) were synthesized by microwave-assisted method and characterized by Infrared spectroscopy; XRD methods and scanning electron microscope (SEM). These were used as adsorbent for the rapid removal of hazardous toxic dye Malachite green (MG) from aqueous phase. The impact of several effective parameters such as contact time, temperature, initial concentration, and agitation speed was investigated and the optimized values of influential parameters like pH, contact time, temperature, initial concentration, and agitation speed on experimentation were found to be 6, 50 min, 298 K, 15 mg/L and 150 rpm respectively. The experimental kinetic data were well fitted to the pseudo-first order reaction kinetics and results. Different adsorption isotherm models like Freundlich, Langmuir and Temkin are used to describe equilibrium adsorption in the adsorbent system and on experimentation the best agreement was achieved with the Langmuir model, for MG, the adsorption capacity of MWCNT-COOH surface was 49.45 mg/g at 298 K. (C) 2015 Elsevier B.V. All rights reserved.
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