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Statements

Subject Item
n2:RIV%2F61989592%3A15310%2F12%3A33141405%21RIV13-MSM-15310___
rdf:type
n17:Vysledek skos:Concept
dcterms:description
Magnetic Fe2O3/carbon hybrids were prepared in a two-step process. First, acetic acid vapor interacted with iron cations dispersed on the surface of a nanocasted ordered mesoporous carbon (CMK-3). In the second step, the primarily created iron acetate species underwent pyrolysis and transformed to magnetic iron oxide nanoparticles. X-ray diffraction, Fouriertransform infrared, and Raman spectroscopies were used for the chemical and structural characterization of the hybrids, while surface area measurements, thermal analysis, and transmission electron microscopy were employed to determine their physical, surface, and textural properties. These results revealed the preservation of the host carbon structure, which was homogenously and controllably loaded (up to 27 wt %) with nanosized (ca. 20 nm) iron oxides inside the mesoporous system. Mössbauer spectroscopy and magnetic measurements at low temperatures confirmed the formation of gama-Fe2O3 nanoparticles exhibiting superparamagnetic behavior. The kinetic studies showed a rapid removal of Cr(VI) ions from the aqueous solutions in the presence of these magnetic mesoporous hybrids and a considerably increased adsorption capacity per unit mass of sorbent in comparison to that of pristine CMK-3 carbon. The results also indicate highly pH-dependent sorption efficiency of the hybrids, whereas their kinetics was described by a pseudo-second-order kinetic model. Taking into account the simplicity of the synthetic procedure and possibility of magnetic separation of hybrids with immobilized pollutant, the developed mesoporousnanomaterials have quite real potential for applications in water treatment technologies. Magnetic Fe2O3/carbon hybrids were prepared in a two-step process. First, acetic acid vapor interacted with iron cations dispersed on the surface of a nanocasted ordered mesoporous carbon (CMK-3). In the second step, the primarily created iron acetate species underwent pyrolysis and transformed to magnetic iron oxide nanoparticles. X-ray diffraction, Fouriertransform infrared, and Raman spectroscopies were used for the chemical and structural characterization of the hybrids, while surface area measurements, thermal analysis, and transmission electron microscopy were employed to determine their physical, surface, and textural properties. These results revealed the preservation of the host carbon structure, which was homogenously and controllably loaded (up to 27 wt %) with nanosized (ca. 20 nm) iron oxides inside the mesoporous system. Mössbauer spectroscopy and magnetic measurements at low temperatures confirmed the formation of gama-Fe2O3 nanoparticles exhibiting superparamagnetic behavior. The kinetic studies showed a rapid removal of Cr(VI) ions from the aqueous solutions in the presence of these magnetic mesoporous hybrids and a considerably increased adsorption capacity per unit mass of sorbent in comparison to that of pristine CMK-3 carbon. The results also indicate highly pH-dependent sorption efficiency of the hybrids, whereas their kinetics was described by a pseudo-second-order kinetic model. Taking into account the simplicity of the synthetic procedure and possibility of magnetic separation of hybrids with immobilized pollutant, the developed mesoporousnanomaterials have quite real potential for applications in water treatment technologies.
dcterms:title
Synthesis and Characterization of gamma-Fe2O3/Carbon Hybrids and Their Application in Removal of Hexavalent Chromium Ions from Aqueous Solutions Synthesis and Characterization of gamma-Fe2O3/Carbon Hybrids and Their Application in Removal of Hexavalent Chromium Ions from Aqueous Solutions
skos:prefLabel
Synthesis and Characterization of gamma-Fe2O3/Carbon Hybrids and Their Application in Removal of Hexavalent Chromium Ions from Aqueous Solutions Synthesis and Characterization of gamma-Fe2O3/Carbon Hybrids and Their Application in Removal of Hexavalent Chromium Ions from Aqueous Solutions
skos:notation
RIV/61989592:15310/12:33141405!RIV13-MSM-15310___
n17:predkladatel
n18:orjk%3A15310
n3:aktivita
n5:P
n3:aktivity
P(ED2.1.00/03.0058), P(GAP208/10/1742), P(KAN115600801)
n3:cisloPeriodika
8
n3:dodaniDat
n7:2013
n3:domaciTvurceVysledku
n6:7008686 n6:9251189 n6:7321023
n3:druhVysledku
n10:J
n3:duvernostUdaju
n14:S
n3:entitaPredkladatele
n20:predkladatel
n3:idSjednocenehoVysledku
172920
n3:idVysledku
RIV/61989592:15310/12:33141405
n3:jazykVysledku
n19:eng
n3:klicovaSlova
surface; adsorption; waste-water; MCM-48 silica; transition-metal; maghemite nanoparticles; magnetic nanoparticles; iron-oxide; activated carbon; ordered mesoporous carbon
n3:klicoveSlovo
n4:adsorption n4:MCM-48%20silica n4:activated%20carbon n4:surface n4:iron-oxide n4:transition-metal n4:ordered%20mesoporous%20carbon n4:maghemite%20nanoparticles n4:magnetic%20nanoparticles n4:waste-water
n3:kodStatuVydavatele
US - Spojené státy americké
n3:kontrolniKodProRIV
[334BA33D77D2]
n3:nazevZdroje
Langmuir: the A C S journal of surfaces and colloids
n3:obor
n12:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
9
n3:projekt
n8:KAN115600801 n8:GAP208%2F10%2F1742 n8:ED2.1.00%2F03.0058
n3:rokUplatneniVysledku
n7:2012
n3:svazekPeriodika
28
n3:tvurceVysledku
Anagnostopoulos, Dimitrios Baikousi, Maria Zbořil, Radek Karakassides, Michael A Bourlinos, Athanasios Bakas, Thomas Douvalis, Alexios Šafářová, Klára Tuček, Jiří
n3:wos
000300757700031
s:issn
0743-7463
s:numberOfPages
13
n11:doi
10.1021/la204006d
n16:organizacniJednotka
15310