Correlation between Iron Reducibility in Natural and Iron-Modified Clays and Its Adsorptive Capability for Arsenic Removal

The study reports aspects that allowed to correlate structural and redox properties of iron species deposited on clay minerals with the capacity of geomaterials for arsenic removal. Natural ferruginous clays as well as an iron-poor clay chemically modified with Fe(III) salt (ferrihydrite species) we...

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Detalles Bibliográficos
Autores principales: Botto, Irma Lía, Tuti, Simonetta, González, María José, Gazzoli, Delia
Formato: Articulo
Lenguaje:Inglés
Publicado: 2016
Materias:
Ciencias Exactas
Química
Ciencias Naturales
Temperature programmed reduction
Iron-oxide species
Arsenic removal
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/100187
https://ri.conicet.gov.ar/11336/48501
http://file.scirp.org/Html/4-1510460_66933.htm
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-100187
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Química
Ciencias Naturales
Temperature programmed reduction
Iron-oxide species
Arsenic removal
spellingShingle Ciencias Exactas
Química
Ciencias Naturales
Temperature programmed reduction
Iron-oxide species
Arsenic removal
Botto, Irma Lía
Tuti, Simonetta
González, María José
Gazzoli, Delia
Correlation between Iron Reducibility in Natural and Iron-Modified Clays and Its Adsorptive Capability for Arsenic Removal
topic_facet Ciencias Exactas
Química
Ciencias Naturales
Temperature programmed reduction
Iron-oxide species
Arsenic removal
description The study reports aspects that allowed to correlate structural and redox properties of iron species deposited on clay minerals with the capacity of geomaterials for arsenic removal. Natural ferruginous clays as well as an iron-poor clay chemically modified with Fe(III) salt (ferrihydrite species) were investigated as adsorbents of the arsenate(V) in water. The study, carried out from minerals from abundant Argentinean deposits, was conducted with the aid of different techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM-EDS), Raman Spectroscopy, ICP-AES (Inductively Coupled Plasma) chemical analysis and Temperature Programmed Reduction (TPR). This last technique allowed to detect availability of iron species in oxidic environment with different structural complexity and to determine active sites, accessible for arsenate(V) adsorption. The effect was observed through temperature dependence of the first Fe(III) reduction step (below 570°C) of iron-oxide species. The sequence of reducibility: ferrihydrite > hydrous oxide (goethite) > anhydrous oxide (hematite) > structural iron in clay was in agreement with the availability of iron active sites for the reducing process as well as for the arsenate adsorption. The important role of very high iron content in original samples was also observed. The chemical activation of iron-poor clay by a simple and feasible modification with Fe(III) solutions promoted the deposition of the ferrihydrite active phase with an increase of 2.81% (expressed as Fe2O3) respect to the original content of 1.07%, constituting an accessible and eco-friendly technological alternative to solve the environmental problem of water containing arsenic.
format Articulo
Articulo
author Botto, Irma Lía
Tuti, Simonetta
González, María José
Gazzoli, Delia
author_facet Botto, Irma Lía
Tuti, Simonetta
González, María José
Gazzoli, Delia
author_sort Botto, Irma Lía
title Correlation between Iron Reducibility in Natural and Iron-Modified Clays and Its Adsorptive Capability for Arsenic Removal
title_short Correlation between Iron Reducibility in Natural and Iron-Modified Clays and Its Adsorptive Capability for Arsenic Removal
title_full Correlation between Iron Reducibility in Natural and Iron-Modified Clays and Its Adsorptive Capability for Arsenic Removal
title_fullStr Correlation between Iron Reducibility in Natural and Iron-Modified Clays and Its Adsorptive Capability for Arsenic Removal
title_full_unstemmed Correlation between Iron Reducibility in Natural and Iron-Modified Clays and Its Adsorptive Capability for Arsenic Removal
title_sort correlation between iron reducibility in natural and iron-modified clays and its adsorptive capability for arsenic removal
publishDate 2016
url http://sedici.unlp.edu.ar/handle/10915/100187
https://ri.conicet.gov.ar/11336/48501
http://file.scirp.org/Html/4-1510460_66933.htm
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