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

Clay Minerals - Tập 29 Số 1 - Trang 105-113 - 1994
María J. Tapia1, F. López Arbeloa1, Teresa Arbeloa1, Íñigo López‐Arbeloa1, Robert A. Schoonheydt2
1Departamento Química-Física, Universidad del País Vasco-EHU, Apartado 644, 48080-Bilbao, Spain
2Centrum voor Oppervlaktechemie en Katalyse, Katholieke Universiteit Leuven, Kardinaal Mercierlaan 92, B-3001 Heverlee, Belgium

Tóm tắt

AbstractThe 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.

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Tài liệu tham khảo

10.1039/ft9908601593

Yariv, 1988, Adsorption of aromatic cations (dyes) by montmorillonite—a review, Int. J. Trop. Agrie., VI, 1

10.1021/la00073a019

Turro, 1978, Modern Molecular Photochemistry

10.1016/0021-9797(92)90254-J

10.1346/CCMN.1990.0380307

Schoonheydt, 1981, Advanced Techniques for Clay Mineral Analysis, 163

Newman, 1987, Chemistry of Clays and Clay Minerals

10.1346/CCMN.1988.0360210

10.1002/ps.2780180202

10.1021/j100159a022

10.1016/0047-2670(80)80001-3

10.1351/pac196511030371

Forster, 1965, Modern Quantum Chemistry Vol III, 93

10.1016/0022-3697(88)90115-1

10.1016/0022-3697(86)90009-0

Dixon, 1977, Minerals in Soil Environments

10.1021/bk-1990-0415.ch019

10.1346/CCMN.1988.0360302

Cenens, 1988, Dissertationes de Agricultura, Spectroscopy of Dye Molecules at Clay Surfaces

10.1021/j100262a019

10.1021/j150668a042

Theng, 1974, The Chemistry of Clay-Organic Reactions

10.1007/978-1-4615-7658-7

10.1180/claymin.1983.018.4.03

Avnir, 1986, Electronic energy transfer on clay surfaces. Rhodamine 6G to cationic dye acceptors, New J., Chem., 10, 153

Grauer, 1984, Adsorption of rhodamine 6G on montmorillonite and laponite, elucidated from electronic absorption and emission spectra. Can, J. Chem., 62, 1889

Ghosal, 1972, Studies on the sorption and desorption of crystal violet on and from bentonite and kaolinite. J. Ind, J, Chem. Soc., 49, 569

10.1016/1010-6030(91)80031-C

Van Olphen, 1979, Data Handbook for Clay Materials and other Non-Metallic Minerals

10.1180/claymin.1992.027.1.10

Sandorfy, 1964, Electronic Spectra and Quantum Chemistry

10.1016/B978-1-4831-9824-8.50007-4

10.1346/CCMN.1990.0380306

10.1021/j100679a009

10.1039/f29888401903

Dale Ortego, 1991, Interactions of montmorillonite with organic compounds, Adsorptive and catalytic properties. Chemospher., 22, 769

10.1039/F29817701725

Laszlo, 1991, Catalysis of organic reactions by inorganic solids. Surf, Sci. Ser., 38, 437

10.1039/f29827800989

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Clay Minerals

Tập 29 Số 1

105-113

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