@article{ajn2021911,
author={{Vargas-Rodr¨ªguez, Y. M. and Obaya, A. and Garc¨ªa-Petronilo, J. E. and Vargas-Rodr¨ªguez, G. I. and G¨®mez-Cort¨¦s, A. and Taviz¨®n, G. and Ch¨¢vez-Carvayar, J. A.},
title={Adsorption Studies of Aqueous Solutions of Methyl Green for Halloysite Nanotubes: Kinetics, Isotherms, and Thermodynamic Parameters},
journal={American Journal of Nanomaterials},
volume={9},
number={1},
pages={1--11},
year={2021},
url={http://pubs.sciepub.com/ajn/9/1/1},
issn={2372-3122},
abstract={Halloysite nanotubes (HNTs) were used to successfully remove methyl green dye from water. The HNTs were also characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), <SUP>29</SUP>Si and <SUP>27</SUP>Al magic angle spinning nuclear magnetic resonance with magic angle spinning (MAS-NMR) and nitrogen adsorption at 77 K. SEM and TEM micrographs showed that HNTs have lengths of 0.2 to 1.5 ¦Ìm, an outer diameter of 100 nm and lumen of 20 nm wide. X-ray diffraction patterns showed that the HNTs were totally dehydrated. HNTs may be regarded as a mesoporous material with a pore size distribution in the range of 1.5-150 ? and specific surface area of 34.49 m<SUP>2</SUP>&#8226;g<SUP>-</SUP><SUP>1</SUP>. The adsorption kinetics and equilibrium data of the dye, initial dye concentration, temperature, pH and contact time effect on removal efficiency were also investigated. Pseudo-first-order, pseudo-second-order, intraparticle diffusion and Elrich models were evaluated in order to determine the rate parameters. The adsorption rate followed pseudo-second-order kinetic model. Adsorption revealed that methyl green was adsorbed as the Langmuir isotherm model describes and the maximum adsorption capacity of the HNTs was achieved (185 mg&#8226;g<SUP>?1</SUP>), being an efficient adsorbent for methyl green adsorption.},
doi={10.12691/ajn-9-1-1}
publisher={Science and Education Publishing}
}