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Spectroscopic Study of the Adsorption of Rhodamine 6G on Laponite B for Low Loadings

Published online by Cambridge University Press:  09 July 2018

M. J. Tapia Estévez ,
F. López Arbeloa ,
T. López Arbeloa ,
I. López Arbeloa  and
R. A. Schoonheydt
M. J. Tapia Estévez
Affiliation:
Departamento Química-Física, Universidad del País Vasco-EHU, Apartado 644, 48080-Bilbao, Spain
F. López Arbeloa
Affiliation:
Departamento Química-Física, Universidad del País Vasco-EHU, Apartado 644, 48080-Bilbao, Spain
T. López Arbeloa
Affiliation:
Departamento Química-Física, Universidad del País Vasco-EHU, Apartado 644, 48080-Bilbao, Spain
I. López Arbeloa
Affiliation:
Departamento Química-Física, Universidad del País Vasco-EHU, Apartado 644, 48080-Bilbao, Spain
R. A. Schoonheydt
Affiliation:
Centrum voor Oppervlaktechemie en Katalyse, Katholieke Universiteit Leuven, Kardinaal Mercierlaan 92, B-3001 Heverlee, Belgium
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Abstract

The adsorption of Rhodamine 6G in aqueous suspension on Laponite B was investigated by electronic absorption and emission spectroscopies. Fluorescence spectra suggest that the monomer is adsorbed at two different surfaces, the external and the internal. A monomer is intercalated in the interlamellar space at low loading of dye (<3% CEC), whereas the monomeric state of the dye seems to be at the solid-aqueous interface in suspensions with high loading (>12% CEC). The metachromatic effect observed in the absorption spectra, for the loading interval between 1% and 15% CEC of Laponite B, is attributed to the dimerization of the dye, which seems, from X-ray diffraction measurements, to be formed at the clay interlayer. The formation constant and the absorption spectrum of the aggregate were obtained and the dimer was structurally characterized by applying the Exciton Theory. The observed fluorescence quenching for loadings lower than 15% CEC is attributed to energy transfer from monomer to the dimer, which obeys the Perrin model.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 1 , March 1994 , pp. 105 - 113
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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