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001-es BibID:	BIBFORM081337
Első szerző:	Kalmár József (vegyész)
Cím:	Kinetics and mechanism of the adsorption of methylene blue from aqueous solution on the surface of a quartz cuvette by on-line UV-Vis spectrophotometry / József Kalmár, Gábor Lente, István Fábián
Dátum:	2016
ISSN:	0143-7208
Megjegyzések:	It is often challenging to follow fast surface adsorption processes with sufficient time resolution. Here we report a convenient UV-Vis spectrophotometry based method to study the fast kinetics of an archetypical surface process: the adsorption of MB on quartz. The test object was a commercial quartz cuvette. About 3.3% of the dye was adsorbed from a 34 ?M solution at pH 7 in 10 min. Biphasic kinetics was observed for the depletion of MB under continuous stirring at 1000 rpm. A kinetic model was postulated for the interpretation of time resolved spectral changes. This model assumes the reversible adsorption of MB on the surface which is followed by the isomerization of the binding mode. The overall process is kinetically first order with respect to MB, thus dimer formation, which was previously proposed to be favored on quartz, can be ruled out. The experimental adsorption isotherm is consistent with the formation of an adsorption monolayer from single molecules. The UV-vis absorbance spectrum of adsorbed MB does not show any blue shift. With the simplest experimental setup, it is shown that the dimerization of MB is not exceptionally favored on quartz surface.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Methylene blue Quartz Adsorption Kinetics Mechanism UV-Vis spectroscopy
Megjelenés:	Dyes And Pigments. - 127 (2016), p. 170-178. -
További szerzők:	Lente Gábor (1973-) (vegyész) Fábián István (1956-) (vegyész)
Pályázati támogatás:	OTKA NK-105156 OTKA DE RH/751/2015 Egyéb TÁMOP-4.2.2.A-11/1/KONV-2012-0043 TÁMOP
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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