期刊
CHEMICAL ENGINEERING RESEARCH & DESIGN
卷 109, 期 -, 页码 824-834出版社
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.cherd.2016.04.001
关键词
Calcined eggshell; MWCNTs; Congo red; Removal
资金
- Research Council of Azarbaijan Shahid Madani University
In this study multiwall carbon nanotubes (MWCNTs) was decorated on calcined eggshell (CES) to obtain a novel and low cost nano-sorbent for removal purposes. The MWCNTs/CES was prepared by a simple hydrothermal method and was characterized by X-ray powder diffraction, scanning electron microscopy and zeta potential measurements. Removal efficiency of the nano-sorbent was evaluated using anionic Congo red dye as a sample pollutant. The experiments were carried out in a batch system to optimize operation variables such as adsorbent dosage, Congo red concentration, solution pH and contact time. Langmuir, Freundlich, Tempkin and Dubinin-Raduskovich adsorption isotherm models were studied and the experimental results were addressed by Langmuir isotherm model. The maximum adsorption capacity was 136.99 mg g(-1), indicating high potential of MWCNTs/CES in the adsorption of Congo red. The adsorption kinetics was studied with the pseudo-first-order, pseudo-second-order, Elovich and intraparticle diffusion models. The thermodynamic parameters indicated that the adsorption of Congo red on the MWCNTs/CES was an exothermic and spontaneous process. Based on experimental results, MWCNTs/CES exhibit improved adsorption performance in comparison with non-treated eggshell (NES) and CES. (C) 2016 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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