Adsorption Behavior of Azo Dyes on Carbon Nanotubes Grown on Alumina: Process Optimization, Kinetics, and Equilibrium Study
Publication: Journal of Environmental Engineering
Volume 145, Issue 2
Abstract
In the present study, carbon nanotubes (CNTs) are synthesized using the chemical vapor deposition method modified by growing the CNTs on alumina (CNT/alumina). The maximum Congo red (CR) dye removal of 96.4% and 94% is obtained using CNT/alumina and CNTs, respectively, as adsorbents for initial dye concentration and an adsorbent dose of 15 mg at pH 2 and 30°C. For Direct red (DR) 80 dye, the maximum removal of 90.5% and 87% is achieved using CNT/alumina and CNTs as adsorbents, respectively, for an initial dye concentration of with an adsorbent dose of 25 mg at pH 4 and 303 K. The adsorption process fits the Langmuir isotherm. For CR dye, the enthalpy () is for CNTs and for CNT/alumina. For DR 80 dye, the value of ( for CNTs and for CNT/alumina) indicates that adsorption of both the dyes onto both adsorbents is endothermic. The values of Gibbs free energy for both dyes are negative for the temperature range between 303 and 323 K, confirming that adsorption is spontaneous and thermodynamically favorable.
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Journal of Environmental Engineering
Volume 145 • Issue 2 • February 2019
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©2018 American Society of Civil Engineers.
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Received: May 22, 2018
Accepted: Jul 18, 2018
Published online: Nov 16, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 16, 2019
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