Vista Equipo: Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite

Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite

The grafting, by chemical adsorption, of molecular 1.10-phenanthroline (OP) onto some Brazilian bentonite (montmorillonites) was studied to improve their adsorptive capacities to remove Cu ions from synthetic wastewater. The quantity of OP adsorbed was 112 mg g-1 of bentonite at pH 8.5 and no signif...

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Autores Principales:	Tejedor De León, Alexis, Goulart Nunes, Denise, Rubio, Jorge
Formato:	Artículo
Idioma:	Inglés Inglés
Publicado:	2018
Materias:	1.10 PHENANTHROLINE ADSORPTION BENTONITE DELAMINATED INTERCALATION PILLARE
Acceso en línea:	http://ridda2.utp.ac.pa/handle/123456789/4458 http://ridda2.utp.ac.pa/handle/123456789/4458

id	RepoUTP4458
recordtype	dspace
spelling	RepoUTP44582021-07-06T15:35:13Z Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite Tejedor De León, Alexis Goulart Nunes, Denise Rubio, Jorge 1.10 PHENANTHROLINE ADSORPTION BENTONITE DELAMINATED INTERCALATION PILLARE 1.10 PHENANTHROLINE ADSORPTION BENTONITE DELAMINATED INTERCALATION PILLARE The grafting, by chemical adsorption, of molecular 1.10-phenanthroline (OP) onto some Brazilian bentonite (montmorillonites) was studied to improve their adsorptive capacities to remove Cu ions from synthetic wastewater. The quantity of OP adsorbed was 112 mg g-1 of bentonite at pH 8.5 and no significant desorption was detectable in acidic or basic solutions. X-ray diffraction (XRD) spectra show that a complex type- is formed in which the OP molecules lay inclined in the clay interlayer. After the intercalation of OP, the adsorptive capacities of the natural bentonites increased by a factor of ten. Thus, adsorption of Cu ions, at optimal pH of 8.0±0.5, showed saturation values, which, calculated by the Langmuir model, yielded 110 mg of Cu ions g-1 of bentonite (3.5 meq g-1). The mechanisms of Cu uptake are ion-exchange adsorption onto untreated bentonite and ion exchange plus Cu2+ phenanthroline complexation (chemisorption) on the modified pillared clay. The desorption of Cu ions from OP clay revealed high uptake irreversibility and physical stability (of the adsorbent) either in strongly acidic or basic solutions. Thus, after acid treatment ~90% of the adsorbed Cu ions continued to be bound onto the OP-modified bentonite surface. The grafting, by chemical adsorption, of molecular 1.10-phenanthroline (OP) onto some Brazilian bentonite (montmorillonites) was studied to improve their adsorptive capacities to remove Cu ions from synthetic wastewater. The quantity of OP adsorbed was 112 mg g-1 of bentonite at pH 8.5 and no significant desorption was detectable in acidic or basic solutions. X-ray diffraction (XRD) spectra show that a complex type- is formed in which the OP molecules lay inclined in the clay interlayer. After the intercalation of OP, the adsorptive capacities of the natural bentonites increased by a factor of ten. Thus, adsorption of Cu ions, at optimal pH of 8.0±0.5, showed saturation values, which, calculated by the Langmuir model, yielded 110 mg of Cu ions g-1 of bentonite (3.5 meq g-1). The mechanisms of Cu uptake are ion-exchange adsorption onto untreated bentonite and ion exchange plus Cu2+ phenanthroline complexation (chemisorption) on the modified pillared clay. The desorption of Cu ions from OP clay revealed high uptake irreversibility and physical stability (of the adsorbent) either in strongly acidic or basic solutions. Thus, after acid treatment ~90% of the adsorbed Cu ions continued to be bound onto the OP-modified bentonite surface. 2018-04-06T18:26:43Z 2018-04-06T18:26:43Z 2018-04-06T18:26:43Z 2018-04-06T18:26:43Z 2003-02-01 2003-02-01 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://ridda2.utp.ac.pa/handle/123456789/4458 http://ridda2.utp.ac.pa/handle/123456789/4458 eng eng https://creativecommons.org/licenses/by-nc-sa/4.0/ info:eu-repo/semantics/openAccess application/pdf
institution	Universidad Tecnológica de Panamá
collection	Repositorio UTP – Ridda2
language	Inglés Inglés
topic	1.10 PHENANTHROLINE ADSORPTION BENTONITE DELAMINATED INTERCALATION PILLARE 1.10 PHENANTHROLINE ADSORPTION BENTONITE DELAMINATED INTERCALATION PILLARE
spellingShingle	1.10 PHENANTHROLINE ADSORPTION BENTONITE DELAMINATED INTERCALATION PILLARE 1.10 PHENANTHROLINE ADSORPTION BENTONITE DELAMINATED INTERCALATION PILLARE Tejedor De León, Alexis Goulart Nunes, Denise Rubio, Jorge Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite
description	The grafting, by chemical adsorption, of molecular 1.10-phenanthroline (OP) onto some Brazilian bentonite (montmorillonites) was studied to improve their adsorptive capacities to remove Cu ions from synthetic wastewater. The quantity of OP adsorbed was 112 mg g-1 of bentonite at pH 8.5 and no significant desorption was detectable in acidic or basic solutions. X-ray diffraction (XRD) spectra show that a complex type- is formed in which the OP molecules lay inclined in the clay interlayer. After the intercalation of OP, the adsorptive capacities of the natural bentonites increased by a factor of ten. Thus, adsorption of Cu ions, at optimal pH of 8.0±0.5, showed saturation values, which, calculated by the Langmuir model, yielded 110 mg of Cu ions g-1 of bentonite (3.5 meq g-1). The mechanisms of Cu uptake are ion-exchange adsorption onto untreated bentonite and ion exchange plus Cu2+ phenanthroline complexation (chemisorption) on the modified pillared clay. The desorption of Cu ions from OP clay revealed high uptake irreversibility and physical stability (of the adsorbent) either in strongly acidic or basic solutions. Thus, after acid treatment ~90% of the adsorbed Cu ions continued to be bound onto the OP-modified bentonite surface.
format	Artículo
author	Tejedor De León, Alexis Goulart Nunes, Denise Rubio, Jorge
author_sort	Tejedor De León, Alexis
title	Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite
title_short	Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite
title_full	Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite
title_fullStr	Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite
title_full_unstemmed	Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite
title_sort	adsorption of cu ions onto a 1.10 phenanthroline-grafted brazilian bentonite
publishDate	2018
url	http://ridda2.utp.ac.pa/handle/123456789/4458 http://ridda2.utp.ac.pa/handle/123456789/4458
_version_	1796209853304143872
score	12.041576

Adsorption of Cu ions onto a 1.10 phenanthroline-grafted Brazilian bentonite

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