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Removal of triclosan by CTAB-modified zeolite-rich tuff from aqueous solutions

Published online by Cambridge University Press:  28 October 2020

Sonia Alvarez-García ,
Guadalupe Macedo-Miranda ,
Sonia Martínez-Gallegos ,
Eduardo Ordoñez-Regíl ,
Jessica López-Castillo  and
Enrique Aguirre-Miranda
Sonia Alvarez-García*
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Colonia Agrícola Bellavista, C.P. 52149, Metepec, México. e-mail: [email protected]
Guadalupe Macedo-Miranda
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Colonia Agrícola Bellavista, C.P. 52149, Metepec, México. e-mail: [email protected]
Sonia Martínez-Gallegos
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Colonia Agrícola Bellavista, C.P. 52149, Metepec, México. e-mail: [email protected]
Eduardo Ordoñez-Regíl
Affiliation:
Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca s/n, La Marquesa, C.P. 52750, Ocoyoacac México.
Jessica López-Castillo
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Colonia Agrícola Bellavista, C.P. 52149, Metepec, México. e-mail: [email protected]
Enrique Aguirre-Miranda
Affiliation:
Tecnológico Nacional de México/Instituto Tecnológico de Toluca, Av. Tecnológico s/n, Colonia Agrícola Bellavista, C.P. 52149, Metepec, México. e-mail: [email protected]
*
[email protected]
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Abstract

Triclosan (TCS) adsorption behavior by a modified zeolite with Cetyl Trimethyl Ammonium Bromide (CTAB) was evaluated factoring in pH, contact time, and TCS initial concentration in a batch system. Natural clinoptilolite-type zeolite from Sonora, Mexico was conditioned with a sodium chloride solution, and, subsequently, modified with CTAB. All the zeolites were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Electron Dispersive Spectroscopy (EDS), and the Zero Point Charge (pHZPC). It was found that the morphological and structural properties of natural zeolite were not affected after treatment with cationic surfactant. Furthermore, adsorption process efficiency was enhanced by the presence of CTAB, obtaining TCS maximum adsorption capacity at an optimal pH of 9.0. In this context, the positively charged surface of the modified zeolite and the anionic triclosan species present were decisive. Kinetics data were well adjusted to a pseudo-second order model with a TCS adsorption capacity of 1.430 ± 0.051 mg g-1 at an equilibrium time of 18 h. Isotherm results were best adjusted to the Langmuir model with a qmax = 2.027 mg g-1 using an initial Co concentration of 18.0 mg L-1, and reaching an equilibrium Ce concentration of 0.559 mg L-1. The mechanism for the adsorption of TCS by CTAB-modified zeolite was proposed to be electrostatic attractions between the group of partial positive charge of CTAB and the anionic species of triclosan. Consequently, CTAB-modified zeolites could be used as effective adsorbents for triclosan removal.

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Articles
Information
MRS Advances , Volume 5 , Issue 62: International Materials Research Congress XXIX , 2020 , pp. 3257 - 3264
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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