TY  - JOUR
AU  - Komlosi, A
AU  - Kuzmann, Ernő
AU  - M. Nagy, Noémi
AU  - Homonnay, Zoltán
AU  - Kubuki, S
AU  - Kónya, József
TI  - Incorporation of Fe in the interlayer of Na-bentonite via treatment with FeCl3 in acetone
JF  - CLAYS AND CLAY MINERALS
J2  - CLAY CLAY MINER
VL  - 55
PY  - 2007
IS  - 1
SP  - 89
EP  - 95
PG  - 7
SN  - 0009-8604
DO  - 10.1346/CCMN.2007.0550107
UR  - https://m2.mtmt.hu/api/publication/1354713
ID  - 1354713
N1  - Megjegyzés-20477956
DOI: 10.1346/CCMN.2007.0550107
AB  - The effect of FeCl3 in acetonic medium on the structure of Na-bentonite was studied using X-ray diffraction (XRD), Fe-57 Mossbauer spectroscopy, X-ray fluorescence spectroscopy and infrared spectroscopy to describe the structure of the bentonite before and after treatment. In the samples treated with FeCl3, an increase in the basal spacing was found by XRD, while a new magnetically split component assigned to Fe3+ incorporated within the interlayer regions of montmorillonite showed up in the low-temperature Mossbauer spectra. The Mossbauer parameters observed were close to those of Fe oxyhydroxides, suggesting the presence of some kind of nanoparticles. These results show that the treatment with acetonic FeCl3 solution is an effective method for introducing Fe into montmorillonite in the form of Fe3+ accommodated in the interlayer region. The treated samples proved to be efficient Lewis catalysts in the acylation of aldehydes (benzaldehyde and 4-OH-benzaldehyde) by acetic acid anhydride.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Nemes, Zoltán
AU  - M. Nagy, Noémi
AU  - Kónya, József
TI  - Kinetics of strontium ion adsorption on natural clay samples
JF  - JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
J2  - J RADIOANAL NUCL CHEM
VL  - 266
PY  - 2005
IS  - 2
SP  - 289
EP  - 293
PG  - 5
SN  - 0236-5731
DO  - 10.1007/s10967-005-0906-3
UR  - https://m2.mtmt.hu/api/publication/1354718
ID  - 1354718
AB  - The adsorption kinetics of strontium ion was studied on seven natural clay samples with radioactive tracer method. The kinetic curves were determined and the kinetic data were evaluated by forms of first-rate kinetic equations with different terms, generally used for adsorption of ions of low concentration. The adsorption process was reduced to two steps. Film diffusion and participle diffusion were found in the case of five samples. Gel diffusion, film diffusion and participle diffusion were found in the case of the other two samples. The presence of significant amount of cristobalite can explain the gel phase in these two samples. The rate coefficients of steps were calculated from the kinetic curves.
LA  - English
DB  - MTMT
ER  -