Sorption of rhodamine B by montmorillonite and laponite

Grauer, Zvi; Malter, Adina B.; Yariv, S.; Avnir, David

doi:10.1016/0166-6622(87)80268-8

Cited by 52 publications

(44 citation statements)

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“…the replacement of the main absorption band of the organic compound by other bands at higher energies. This effect is attributed to the selfaggregation of the dye when it is adsorbed on the clay surface (Grauer et al, 1987;Cenens et al, 1990), although an interaction between the electronlone pair of the oxygen atoms of the silicate layer with the n-electrons of the aromatic system can not be excluded (Yariv et al, 1990).…”

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confidence: 99%

“…Moreover, these dyes are cationic compounds with a high tendency to be adsorbed on the clay surface by cation exchange. Due to steric hindrance of the carboxyphenyl group of the dye, the ~-system rhodamine-clay interaction would be negligible (Grauer et al, 1987) and, therefore, the metachromasy should be attributed to the self association of the dye. The dye aggregation of rhodamines in homogeneous solutions is a well documented phenomenon (L6pez Arbeloa et al, 1982Arbeloa et al, , 1988.…”

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confidence: 99%

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Spectroscopic study of the adsorption of rhodamine 6G on clay minerals in aqueous suspensions

Arbeloa

Tapia²,

Arbeloa³

et al. 1997

Clay miner.

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A B STRACT: Absorption and fluorescence spectroscopies were applied to study the adsorption of rhodamine 6G on several smectite-type clays in aqueous suspension. The dye can be adsorbed as the monomeric and the dimeric forms on both the external and the interlamellar surfaces of the clay. The presence of these species and their evolution with the stirring time of the sample and the relative dye/ clay concentration depend on the nature of the smectite, the clay concentration and the particle size, factors that also affect the dispersion degree of the clay particles in water.In recent years, the research on colloidal systems has become more important to the scientific community, since colloid chemistry plays a significant role in the progress of modem chemistry and engineering. The use of aromatic compounds as molecular probes has allowed the application of electronic spectroscopies to study the properties of microheterogeneous systems (Thomas, 1984;Kalyanasundaram, 1987;Gehlen & De Schryver, 1993), providing significant information on the surface properties of the interface between the dispersed phase and the dispersing medium. These properties affect the adsorption and distribution of compounds in both phases of organized media. One of these systems is clay minerals in aqueous suspensions, the interest in which is based on their important applications in several fields such as agriculture, catalysis, decontamination of waste water and pharmaceutical and paint industries (Theng, 1974;Laszlo, 1991;Murray, 1991).Smectite-type clays have a lamellar structure formed by the condensation of an octahedral sheet of A1203 or MgO between two tetrahedral SiO2 sheets, the so-called TOT layer (Newman, 1987). The isomorphic substitution of some A13+, Mg 2+ or Si 4 § by cations with a lower oxidation number gives rise to a negative charge of the layers which is compensated by interchangeable inorganic cations at the lamellar surface. The inorganic cations can cause the stacking of clay layers in parallel planes, the face-to-face aggregation, leading to the tactoidal structure of smectites with two main adsorption surfaces: the external and the internal. The dispersion of smectite particles in aqueous suspensions and the capacity of clays to adsorb organic compounds depend, among other factors, on the nature of the negative charge of the layers (octahedral or tetrahedral substitution), the nature of the inorganic cations, the swelling of the interlamellar space, and the particle size.Although several techniques (thermogravimetry, X-ray diffraction and FTIR, SERS and NMR spectroscopies) have been largely used to study organo-clay systems in the solid state, these methods are limited techniques in the study of organo-clay systems in aqueous suspensions. Recently, the X-ray microscopic technique has been applied to study clay aggregates in aqueous environments (Niemeyer et al., 1994), but this technique gives information on the clay particles rather than the distribution of organic compounds on clays. The UV-Vis absorption and fluo...

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confidence: 99%

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confidence: 99%

Spectroscopic study of the adsorption of rhodamine 6G on clay minerals in aqueous suspensions

Arbeloa

Tapia²,

Arbeloa³

et al. 1997

Clay miner.

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“…The smaller shifts in montmorillonite and Hectorite were attributed to monomer absorption on the external clay surface and the intermediate shifts were attributed to monomer adsorption in the interlamellar regions, and the larger shifts were attributed to dimers or higher order aggregates. Grauer et al [34] found red shift of about 10 nm for rhodamine 6G in Laponite surface. Tapia Este´vez and co-workers reported a red shift of the monomer absorption of rhodamine 6G by 11 and 24 nm in Laponite [36,37].…”

Section: Spectroscopic Investigationmentioning

confidence: 96%

“…The adsorption of the dye in clay systems has generally been attributed to ion exchange [32][33][34][35][36], although Yariv et. al.…”

Section: Spectroscopic Investigationmentioning

confidence: 99%

Fluorescence Resonance Energy Transfer between organic dyes adsorbed onto nano-clay and Langmuir–Blodgett (LB) films

Hussain

Chakraborty

Bhattacharjee

et al. 2010

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Abstract:In this communication we investigate two dyes N N ′ , -dioctadecyl thiacyanine perchlorate (NK) and octadecyl rhodamine B chloride (RhB) in Langmuir and Langmuir-Blodgett (LB) films with or with out a synthetic clay laponite. Observed changes in isotherms of RhB in absence and presence of nano-clay platelets indicate the incorporation of clay platelets onto RhB-clay hybrid films. AFM image confirms the incorporation of clay in hybrid films. FRET was observed in clay dispersion and LB films with and without clay. Efficiency of energy transfer was maximum in LB films with clay.Keywords: Fluorescence Resonance Energy Transfer (FRET), Langmuir-Blodgett, pressure-area isotherm, clay, dyes, Atomic Force Microscope (AFM). IntroductionFluorescence Resonance Energy Transfer (FRET) is a physical phenomenon first described over 50 years ago [1,2]. Due to its sensitivity to distance, FRET has been used to investigate molecular level interaction. Fluorescence emission rate of energy transfer has wide applications in biomedical, protein folding, RNA/DNA identification and their energy transfer process [3][4][5][6][7][8][9]. Another important application of energy transfer is in dye lasers. Dye lasers have some limitations as the dye solution used as an active medium absorbs energy from the excitation source in a very limited spectral range and so the emission band also has these limitations. If a dye laser has to be used as an ideal source its spectral range needs to be extended. In order to extend the spectral range of operation, mixtures of different dye solutions/dye molecules embedded in solid matrices are being used. The work on energy transfer between different dye molecules in such mixtures in various solvents and solid matrices is, therefore, of great importance. The use of such energy transfer in dye lasers is also helpful in minimizing the photo-quenching effects and thereby, increasing the laser efficiency.FRET is the relaxation of an excited donor molecule by transfer of its excited energy to an acceptor molecule

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“…Ref. [1][2][3][4][5][6][7][8] because of the importance of this reaction in various iridustrial, environmental and agricultural processes. In recent years laponite, a synthetic hectorite, has replaced montmorillonite in some of its industrial applications, and consequently, the adsorption of organic aromatic dyes by this mineral has been investigated by several authors (see e.g.…”

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confidence: 99%

Thermal analytic study of the adsorption of crystal violet by laponite

Yariv

Müller-Vonmoos

Kahr

et al. 1989

Journal of Thermal Analysis

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The adsorption of crystal violet on laponite was investigated by X-ray diffraction and thermal analysis. DTA, TG and DTG curves were recorded in air. The evolved H20, CO2, NO2, H2 and C2H 6 were simultaneously determined by mass spectrometry. The thermal analysis curves were compared on one hand with the thermal analysis curves of laponite and on the other hand with thermal analysis curves of non-adsorbed crystal violet and of crystal violet adsorbed on montmorillonite. The thermal analysis curves of crystal violet adsorbed on laponite show similarities to the curves of the non-adsorbed crystal violet/but differ from the curves of crystal violet adsorbed on montmorillonite. The differences in the thermal behaviour were attributed to n interactions ~vhich do not occur between crystal violet and laponite but do occur between this dye and montmorillonite.

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Sorption of rhodamine B by montmorillonite and laponite

Cited by 52 publications

References 10 publications

Spectroscopic study of the adsorption of rhodamine 6G on clay minerals in aqueous suspensions

Spectroscopic study of the adsorption of rhodamine 6G on clay minerals in aqueous suspensions

Fluorescence Resonance Energy Transfer between organic dyes adsorbed onto nano-clay and Langmuir–Blodgett (LB) films

Thermal analytic study of the adsorption of crystal violet by laponite

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