Metachromasy in clay minerals. Spectroscopic study of the adsorption of crystal violet by laponite

1990 ◽  
Vol 86 (9) ◽  
pp. 1593 ◽  
Author(s):  
Shmuel Yariv ◽  
Ahmed Nasser ◽  
Ptahia Bar-on
Keyword(s):  
Spectroscopic Study ◽  
Clay Minerals ◽  
Crystal Violet

A Mössbauer Spectroscopic Study of Aluminum- and Iron-Pillared Clay Minerals

2010 ◽  
Vol 58 (2) ◽  
pp. 164-173 ◽  
Author(s):  
Amina Aouad ◽  
Alexandre S. Anastácio ◽  
Faïza Bergaya ◽  
Joseph W. Stucki
Keyword(s):  
Spectroscopic Study ◽  
Clay Minerals ◽  
Pillared Clay

scholarly journals Two-dimensional electronic-vibrational spectroscopic study of conical intersection dynamics: an experimental and electronic structure study

2019 ◽  
Vol 21 (26) ◽  
pp. 14153-14163 ◽  
Author(s):  
Eric C. Wu ◽  
Qinghui Ge ◽  
Eric A. Arsenault ◽  
Nicholas H. C. Lewis ◽  
Natalie L. Gruenke ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Spectroscopic Study ◽  
Crystal Violet ◽  
Structure Study ◽  
Conical Intersection ◽  
Singlet Excited State ◽  
Two Dimensional ◽  
Triphenylmethane Dyes ◽  
Green Is

The relaxation from the lowest singlet excited state of the triphenylmethane dyes, crystal violet and malachite green, is studied via two-dimensional electronic-vibrational (2DEV) spectroscopy.

scholarly journals PRELIMINARY SPECTROSCOPIC STUDY OF FE-BEARING CLAY MINERALS IN ALTERED PILLOW LAVAS FROM LAMIA AREA, GREECE1

2017 ◽  
Vol 50 (4) ◽  
pp. 2163
Author(s):  
B. Katranidou ◽  
A. Godelitsas ◽  
I. Sanakis
Keyword(s):  
Spectroscopic Study ◽  
Clay Minerals ◽  
Geological Material ◽  
Spectroscopic Measurements ◽  
Central Greece ◽  
Pillow Lavas ◽  
First Time

Geological material, of greenish color, filling interspaces in altered Triassic pillow lavas of Lamia area (central Greece) was studied, for the first time in the literature. According to XRD and SEM-EDS data it predominantly consists of calcite, zeolites and clay minerals. The zeolites concern thomsonite and analcime. The clay minerals, on the basis of XRD, FTIR and Mössbauer spectroscopic measurements, constitute a Fe-bearing phase of the illlite-glauconite-celadonite group (most likely Fe-illite).

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

Clay Minerals ◽  
1997 ◽  
Vol 32 (1) ◽  
pp. 97-106 ◽  
Author(s):  
F. Lopez Arbeloa ◽  
M. J. Tapia Estevez ◽  
T. Lopez Arbeloa ◽  
I. Lopez Arbeloa
Keyword(s):  
Particle Size ◽  
Spectroscopic Study ◽  
Clay Minerals ◽  
Rhodamine 6G ◽  
Aqueous Suspension ◽  
Clay Particles ◽  
Aqueous Suspensions ◽  
Clay Concentration ◽  
Dispersion Degree ◽  
Stirring Time

AbstractAbsorption 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.

scholarly journals X-ray Photoelectron Spectroscopic Study of Some Organic and Inorganic Modified Clay Minerals

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7115
Author(s):  
J. Theo Kloprogge ◽  
Concepcion P. Ponce ◽  
Danilo O. Ortillo
Keyword(s):  
Spectroscopic Study ◽  
Clay Minerals ◽  
Functional Groups ◽  
Organic Compounds ◽  
Oxidation State ◽  
Binding Energies ◽  
X Ray ◽  
Oxidative Transformations ◽  
Layered Clay

Layered clay systems intercalated with inorganic and organic compounds were analyzed to highlight how XPS can provide information on the different environments surrounding a particular atom as well as provide discernments on the size, coordination, and structural and oxidative transformations of the intercalating/pillaring compounds. XPS data on the intercalation of urea and K-acetate in low- and high-defect kaolinite revealed the interaction of the intercalating group NH2 with the siloxane functional groups in the interlayer surface. The intercalation of HDTMA in Mt demonstrated the use of XPS in monitoring the change in conformation assumed by alkylammonium intercalating compounds in Mt with increasing CEC. Studies on the pillaring of Mt by Al13 and Ga13 by XPS allowed determination of the coordination of the pillaring compound within the Mt layer. Lastly, the intercalation of hexacyanoferrate in hydrotalcite demonstrated the capability of XPS in following changes in the oxidation state of the iron compound. These were gleaned from interpretation of the shifts in binding energies and presence of multiplet splitting in the XPS of the component elements of the minerals or the intercalating compounds.

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