The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies

The elimination of diclofenac traces from aqueous environments is important. In this research, the effect of alkaline (NaOH) pretreatment on clinoptilolite before its modification with a surfactant (HDTMA) for diclofenac adsorption under the speculation of the sole presence of diclofenac in the aque...

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Autores principales:	Fateme Poorsharbaf Ghavi, Fereshteh Raouf, Ahmad Dadvand Koohi
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	adsorption alkaline pretreatment clinoptilolite diclofenac hdtma Public aspects of medicine RA1-1270
Acceso en línea:	https://doaj.org/article/385cbc6108c34aa3995a2aa7ff5b8fa2
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spelling	oai:doaj.org-article:385cbc6108c34aa3995a2aa7ff5b8fa22021-11-06T05:45:58ZThe effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies1477-89201996-782910.2166/wh.2020.057https://doaj.org/article/385cbc6108c34aa3995a2aa7ff5b8fa22021-02-01T00:00:00Zhttp://jwh.iwaponline.com/content/19/1/47https://doaj.org/toc/1477-8920https://doaj.org/toc/1996-7829The elimination of diclofenac traces from aqueous environments is important. In this research, the effect of alkaline (NaOH) pretreatment on clinoptilolite before its modification with a surfactant (HDTMA) for diclofenac adsorption under the speculation of the sole presence of diclofenac in the aqueous solution is investigated. The results are compared through isotherm, kinetic, and thermodynamic studies and supplemented by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), and the zeta potential analyses. The contact time was investigated in a 0–180-min range. The pH effect was studied in a range of 5–10 because of diclofenac dissociation below pH = 5. The effect of the temperature on diclofenac adsorption was also considered by establishing the experiments at 25, 35, and 45 °C. For HDTMA-modified clinoptilolite, Temkin, and for NaOH-HDTMA-modified clinoptilolite, Dubinin–Radushkevich, and Freundlich isotherm models and in both cases, the pseudo-second-order kinetic model fitted the experimental data best. All the enthalpy and the entropy changes were negative, suggesting exothermic adsorption with a decrease in the degree of freedom of diclofenac anions after the adsorption. Furthermore, diclofenac physisorption was confirmed through isotherm and kinetic studies.Fateme Poorsharbaf GhaviFereshteh RaoufAhmad Dadvand KoohiIWA Publishingarticleadsorptionalkaline pretreatmentclinoptilolitediclofenachdtmaPublic aspects of medicineRA1-1270ENJournal of Water and Health, Vol 19, Iss 1, Pp 47-66 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	adsorption alkaline pretreatment clinoptilolite diclofenac hdtma Public aspects of medicine RA1-1270
spellingShingle	adsorption alkaline pretreatment clinoptilolite diclofenac hdtma Public aspects of medicine RA1-1270 Fateme Poorsharbaf Ghavi Fereshteh Raouf Ahmad Dadvand Koohi The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies
description	The elimination of diclofenac traces from aqueous environments is important. In this research, the effect of alkaline (NaOH) pretreatment on clinoptilolite before its modification with a surfactant (HDTMA) for diclofenac adsorption under the speculation of the sole presence of diclofenac in the aqueous solution is investigated. The results are compared through isotherm, kinetic, and thermodynamic studies and supplemented by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET), and the zeta potential analyses. The contact time was investigated in a 0–180-min range. The pH effect was studied in a range of 5–10 because of diclofenac dissociation below pH = 5. The effect of the temperature on diclofenac adsorption was also considered by establishing the experiments at 25, 35, and 45 °C. For HDTMA-modified clinoptilolite, Temkin, and for NaOH-HDTMA-modified clinoptilolite, Dubinin–Radushkevich, and Freundlich isotherm models and in both cases, the pseudo-second-order kinetic model fitted the experimental data best. All the enthalpy and the entropy changes were negative, suggesting exothermic adsorption with a decrease in the degree of freedom of diclofenac anions after the adsorption. Furthermore, diclofenac physisorption was confirmed through isotherm and kinetic studies.
format	article
author	Fateme Poorsharbaf Ghavi Fereshteh Raouf Ahmad Dadvand Koohi
author_facet	Fateme Poorsharbaf Ghavi Fereshteh Raouf Ahmad Dadvand Koohi
author_sort	Fateme Poorsharbaf Ghavi
title	The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies
title_short	The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies
title_full	The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies
title_fullStr	The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies
title_full_unstemmed	The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies
title_sort	effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/385cbc6108c34aa3995a2aa7ff5b8fa2
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The effect of alkaline pretreatment on surfactant-modified clinoptilolite for diclofenac adsorption: isotherm, kinetic, and thermodynamic studies

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