Cargando…

The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix

The fixation of heavy metals (Ba, Cu, Pb) in an alkali-activated matrix was investigated. The matrix consisted of fly ash and blast furnace slag (BFS). The mixture of NaOH and Na-silicate was used as alkaline activator. Three analytical techniques were used to describe the fixation of heavy metals—X...

Descripción completa

Detalles Bibliográficos
Autores principales: Koplík, Jan, Kalina, Lukáš, Másilko, Jiří, Šoukal, František
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456941/
https://www.ncbi.nlm.nih.gov/pubmed/28773655
http://dx.doi.org/10.3390/ma9070533
_version_ 1783241424064479232
author Koplík, Jan
Kalina, Lukáš
Másilko, Jiří
Šoukal, František
author_facet Koplík, Jan
Kalina, Lukáš
Másilko, Jiří
Šoukal, František
author_sort Koplík, Jan
collection PubMed
description The fixation of heavy metals (Ba, Cu, Pb) in an alkali-activated matrix was investigated. The matrix consisted of fly ash and blast furnace slag (BFS). The mixture of NaOH and Na-silicate was used as alkaline activator. Three analytical techniques were used to describe the fixation of heavy metals—X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), and X-ray powder diffraction (XRD). All heavy metals formed insoluble salts after alkaline activation. Ba was fixed as BaSO(4), and only this product was crystalline. EDS mapping showed that Ba was cumulated in some regions and formed clusters. Pb was present in the form of Pb(OH)(2) and was dispersed throughout the matrix on the edges of BFS grains. Cu was fixed as Cu(OH)(2) and also was cumulated in some regions and formed clusters. Cu was present in two different chemical states; apart from Cu(OH)(2), a Cu–O bond was also identified.
format Online
Article
Text
id pubmed-5456941
institution National Center for Biotechnology Information
language English
publishDate 2016
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-54569412017-07-28 The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix Koplík, Jan Kalina, Lukáš Másilko, Jiří Šoukal, František Materials (Basel) Article The fixation of heavy metals (Ba, Cu, Pb) in an alkali-activated matrix was investigated. The matrix consisted of fly ash and blast furnace slag (BFS). The mixture of NaOH and Na-silicate was used as alkaline activator. Three analytical techniques were used to describe the fixation of heavy metals—X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS), and X-ray powder diffraction (XRD). All heavy metals formed insoluble salts after alkaline activation. Ba was fixed as BaSO(4), and only this product was crystalline. EDS mapping showed that Ba was cumulated in some regions and formed clusters. Pb was present in the form of Pb(OH)(2) and was dispersed throughout the matrix on the edges of BFS grains. Cu was fixed as Cu(OH)(2) and also was cumulated in some regions and formed clusters. Cu was present in two different chemical states; apart from Cu(OH)(2), a Cu–O bond was also identified. MDPI 2016-06-30 /pmc/articles/PMC5456941/ /pubmed/28773655 http://dx.doi.org/10.3390/ma9070533 Text en © 2016 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Koplík, Jan
Kalina, Lukáš
Másilko, Jiří
Šoukal, František
The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix
title The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix
title_full The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix
title_fullStr The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix
title_full_unstemmed The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix
title_short The Characterization of Fixation of Ba, Pb, and Cu in Alkali-Activated Fly Ash/Blast Furnace Slag Matrix
title_sort characterization of fixation of ba, pb, and cu in alkali-activated fly ash/blast furnace slag matrix
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5456941/
https://www.ncbi.nlm.nih.gov/pubmed/28773655
http://dx.doi.org/10.3390/ma9070533
work_keys_str_mv AT koplikjan thecharacterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix
AT kalinalukas thecharacterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix
AT masilkojiri thecharacterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix
AT soukalfrantisek thecharacterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix
AT koplikjan characterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix
AT kalinalukas characterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix
AT masilkojiri characterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix
AT soukalfrantisek characterizationoffixationofbapbandcuinalkaliactivatedflyashblastfurnaceslagmatrix