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001-es BibID:	BIBFORM018708
Első szerző:	Komlósi Andrea
Cím:	Incorporation of Fe in the interlayer of Na-bentonite VIA treatment with FeCl3 in acetone / Komlósi, Andrea, Kuzmann, Ernő, Nagy, Noémi M., Homonnay, Zoltán, Kubuki, Shiro, Kónya, József
Dátum:	2007
ISSN:	0009-8604
Megjegyzések:	he effect of FeCl(3) in acetonic medium on the structure of Na-bentonite was studied using X-ray diffraction (XRD), (57)Fe 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 FeCl(3), an increase in the basal spacing was found by XRD, while a new magnetically split component assigned to Fe(3+) 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 FeCl(3) solution is an effective method for introducing Fe into montmorillonite in the form of Fe(3+) 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.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban bentonite clay iron Mössbauer spectroscopy
Megjelenés:	Clays And Clay Minerals. - 55 : 1 (2007), p. 89-95. -
További szerzők:	Kuzmann Ernő Nagy Noémi, M. (1960-) (vegyész, angol szakfordító) Homonnay Zoltán Kubuki, Shiro Kónya József (1937-) (vegyész)
Pályázati támogatás:	T043687 OTKA
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM102394
Első szerző:	Nagy Noémi, M. (vegyész, angol szakfordító)
Cím:	Study of the change in the properties of Mn-bentonite by aging / Noémi M. Nagy, Andrea Komlósi, József Kónya
Dátum:	2004
ISSN:	0021-9797
Megjegyzések:	In this paper the structure and properties of fresh manganese(II)?bentonite was compared with that of an old substance. It was concluded that the oxidation state of Mn changed. This did not cause many changes in the scanning electron microscope (SEM) and in the X-ray diffraction (XRD) studies; caused minor changes in the Mn concentration (determined by XRF) and thermoanalytical and electron spectroscopy analysis (ESCA). The change in the oxidation state of manganese was indicated by the colors of the samples, the difference in the surface sites, titration curves, redox potentials, adsorption, and catalytic activity of the fresh and the old Mn?bentonite. Potentiometric titration data were evaluated by a surface complexation model using the FITEQL3.2 computer program. Stability constants of edge charge reactions and the number of aluminol, silanol, and edge sites were calculated. Potentiometric titration data of commercial and freshly made MnO2 were also evaluated; the calculated constants and site numbers were compared with that of found in literature. Catalytic and adsorption activity of the samples were also investigated. It was found that fresh Mn?bentonite does not adsorb valine, while the old one and MnO2 does. Fresh Mn?bentonite does not catalyze the decomposition of H2O2, while the old one, as well as MnO2 does.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Manganese Oxidation state Bentonite Manganese dioxide Surface complexation model
Megjelenés:	Journal Of Colloid And Interface Science. - 278 : 1 (2004), p. 166-172. -
További szerzők:	Komlósi Andrea Kónya József (1937-) (vegyész)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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