This HTML5 document contains 44 embedded RDF statements represented using HTML+Microdata notation.

The embedded RDF content will be recognized by any processor of HTML5 Microdata.

Namespace Prefixes

PrefixIRI
dctermshttp://purl.org/dc/terms/
n7http://linked.opendata.cz/resource/domain/vavai/riv/tvurce/
n9http://linked.opendata.cz/ontology/domain/vavai/
n17http://linked.opendata.cz/resource/domain/vavai/vysledek/RIV%2F61388980%3A_____%2F14%3A00439270%21RIV15-AV0-61388980/
shttp://schema.org/
skoshttp://www.w3.org/2004/02/skos/core#
n4http://linked.opendata.cz/ontology/domain/vavai/riv/
n14http://bibframe.org/vocab/
n2http://linked.opendata.cz/resource/domain/vavai/vysledek/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
n6http://linked.opendata.cz/ontology/domain/vavai/riv/klicoveSlovo/
n5http://linked.opendata.cz/ontology/domain/vavai/riv/duvernostUdaju/
xsdhhttp://www.w3.org/2001/XMLSchema#
n15http://linked.opendata.cz/ontology/domain/vavai/riv/aktivita/
n13http://linked.opendata.cz/ontology/domain/vavai/riv/jazykVysledku/
n16http://linked.opendata.cz/ontology/domain/vavai/riv/druhVysledku/
n10http://linked.opendata.cz/ontology/domain/vavai/riv/obor/
n11http://reference.data.gov.uk/id/gregorian-year/

Statements

Subject Item
n2:RIV%2F61388980%3A_____%2F14%3A00439270%21RIV15-AV0-61388980
rdf:type
n9:Vysledek skos:Concept
dcterms:description
The iron chemistry of aluminosilicates can markedly affect their adsorption properties due to possible changes in surface charge upon exposure to a variety of processes in the environment. One of these processes is chemical leaching, but to date little has been reported on the susceptibility of structural Fe to chemical leaching. The purpose of the current study was to determine the effects of solution pH on the stability of structural Fe in kaolinites, illite, and bentonite and the potential for formation of ancillary (oxyhydr)oxides. Structurally bound Fe does not participate in sorption properties but Fe that is released and phase transformed during leaching could take part in adsorption processes and form complexes and/or covalent bonds via Fe ions. Five different Fe-bearing clay minerals were treated in 0.5 M and 2 M HCl, distilled H2O, 0.1 M KCl, and 0.5 M KHCO3 for 24 h. The amount of Fe leached varied from 10 mu g g(-1) (for 0.1 M KCl) to 104 fig (for 2 M HCl) depending on the leaching agents. Acidic and water treatments indicated a relative independence of leached Fe on the initial Fe content in the clay and, conversely, a heavy dependence on the crystallinity of initial Fe phases. Well crystallized Fe(III) was stable during the leaching process, while poorly crystallized and amorphous Fe(III) phases were less stable, forming new ion-exchangeable Fe3+ particles. Under alkaline conditions, no relation between Fe crystallinity and mobility was found. The structural and surface changes resulting from leaching processes were identified by equilibrium adsorption isotherms. In kaolinite, the specific surface area (SBET) and porosity changed independently of Fe leaching due to the stability and crystallinity of Fe. The iron chemistry of aluminosilicates can markedly affect their adsorption properties due to possible changes in surface charge upon exposure to a variety of processes in the environment. One of these processes is chemical leaching, but to date little has been reported on the susceptibility of structural Fe to chemical leaching. The purpose of the current study was to determine the effects of solution pH on the stability of structural Fe in kaolinites, illite, and bentonite and the potential for formation of ancillary (oxyhydr)oxides. Structurally bound Fe does not participate in sorption properties but Fe that is released and phase transformed during leaching could take part in adsorption processes and form complexes and/or covalent bonds via Fe ions. Five different Fe-bearing clay minerals were treated in 0.5 M and 2 M HCl, distilled H2O, 0.1 M KCl, and 0.5 M KHCO3 for 24 h. The amount of Fe leached varied from 10 mu g g(-1) (for 0.1 M KCl) to 104 fig (for 2 M HCl) depending on the leaching agents. Acidic and water treatments indicated a relative independence of leached Fe on the initial Fe content in the clay and, conversely, a heavy dependence on the crystallinity of initial Fe phases. Well crystallized Fe(III) was stable during the leaching process, while poorly crystallized and amorphous Fe(III) phases were less stable, forming new ion-exchangeable Fe3+ particles. Under alkaline conditions, no relation between Fe crystallinity and mobility was found. The structural and surface changes resulting from leaching processes were identified by equilibrium adsorption isotherms. In kaolinite, the specific surface area (SBET) and porosity changed independently of Fe leaching due to the stability and crystallinity of Fe.
dcterms:title
Stability of iron in clays under different leaching conditions Stability of iron in clays under different leaching conditions
skos:prefLabel
Stability of iron in clays under different leaching conditions Stability of iron in clays under different leaching conditions
skos:notation
RIV/61388980:_____/14:00439270!RIV15-AV0-61388980
n4:aktivita
n15:I
n4:aktivity
I
n4:cisloPeriodika
1-2
n4:dodaniDat
n11:2015
n4:domaciTvurceVysledku
n7:4208994
n4:druhVysledku
n16:J
n4:duvernostUdaju
n5:S
n4:entitaPredkladatele
n17:predkladatel
n4:idSjednocenehoVysledku
46951
n4:idVysledku
RIV/61388980:_____/14:00439270
n4:jazykVysledku
n13:eng
n4:klicovaSlova
Clays; Iron; Leaching Stability; Structure; Surface Properties
n4:klicoveSlovo
n6:Iron n6:Surface%20Properties n6:Clays n6:Leaching%20Stability n6:Structure
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[0ED2F3C55EB7]
n4:nazevZdroje
Clays and Clay Minerals
n4:obor
n10:DD
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
6
n4:rokUplatneniVysledku
n11:2014
n4:svazekPeriodika
62
n4:tvurceVysledku
Matys Grygar, Tomáš Spurná, P. Fuitová, L. Koloušek, D. Doušová, B. Lhotka, M.
n4:wos
000339858200016
s:issn
0009-8604
s:numberOfPages
8
n14:doi
10.1346/CCMN.2014.0620207