A vibrational spectroscopic study of the silicate mineral analcime – Na2(Al4SiO4O12)·2H2O – A natural zeolite

Frost, Ray L.; López, Andrés; Theiss, Frederick L.; Romano, Antônio Wilson; Scholz, Ricardo

doi:10.1016/j.saa.2014.06.034

Cited by 11 publications

(8 citation statements)

References 22 publications

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“…Thus, no representative bands between 3650 and 3200 cm -1 related to the vibration stretching of OH bond were found. 5,18 However, the OH vibration stretching also could be due to the OH present in minerals. So, a low content of hydroxides is expected for the surface of these solids.…”

Section: Resultsmentioning

confidence: 99%

Cold Plasma and Acid Treatment Modification Effects on Phonolite

Herrador

Tišler²,

Hájková³

et al. 2017

ACSi

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A sample of phonolite was treated by cold plasma and hydrochloric acid diluted in water to study the change of its structure and acid properties. The phonolite and treated samples were analysed by XRD, elemental analysis XRF, specific surface area BET, TPD-NH 3 and FT-IR spectroscopy. They were also tested in the adsorption of Ca, K, Mg, P and Na impurities present in waste cooking oil. Plasma treated sample presented almost the same structure with some surface differences respect to the original phonolite. However, acid treated sample presented bigger total surface compared to the other samples, different structure, composition and acid properties.

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Section: Resultsmentioning

confidence: 99%

Cold Plasma and Acid Treatment Modification Effects on Phonolite

Herrador

Tišler²,

Hájková³

et al. 2017

ACSi

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“…Moreover, the complete mineral species are depicted on Table 1. The identification of the mineral species has been done considering the following references: Fe-oxides (Jubb and Allen, 2010;Rull et al, 2007), Ti-oxides (Lukačević et al, 2012;Sekiya et al, 2001), Si-oxides (Karwowski et al, 2013;Zotov et al, 1999), carbonates (Buzgar and Apopei, 2009;Koura et al, 1996), sulfates Chio et al, 2005), silicates (Freeman et al, 2008), zeolites (Chen et al, 2007;Frost et al, 2014) and clays (Frost et al, 2001;Haley et al, 1982;Martens et al, 2002) (see Table 2). Also, the RUFF database and the Unidad Asociada spectra collection have been used for the identification (Downs et al, 2015).…”

Section: Raman Analysismentioning

confidence: 99%

“…The analcime presents the main following vibrations: (1) the water librations E g at 390 cm À1 (2) the O-(Al, Si)-O bending E g at 480 cm À1 (3) the (Al, Si)-O stretching F 2g at 1100 cm À1 (Frost et al, 2014). Concerning the clays, two types were detected: (1) kaolinite and (2) site (Haley et al, 1982).…”

Section: Raman Analysismentioning

confidence: 99%

Raman–Mössbauer–XRD studies of selected samples from “Los Azulejos” outcrop: A possible analogue for assessing the alteration processes on Mars

Lalla

Sanz-Arranz

López‐Reyes

et al. 2016

Advances in Space Research

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The outcrop of ''Los Azulejos" is visible at the interior of the Cañ adas Caldera in Tenerife Island (Spain). It exhibits a great variety of alteration processes that could be considered as terrestrial analogue for several geological processes on Mars. This outcrop is particularly interesting due to the content of clays, zeolite, iron oxides, and sulfates corresponding to a hydrothermal alteration catalogued as ''Azulejos" type alteration. A detailed analysis by portable and laboratory Raman systems as well as other different techniques such as X-ray diffraction (XRD) and Mö ssbauer spectroscopy has been carried out (using twin-instruments from Martian lander missions: Mö ssbauer spectrometer MIMOS-II from the NASA-MER mission of 2001 and the XRD diffractometer from the NASA-MSL Curiosity mission of 2012). The mineral identification presents the following mineral species: magnetite, goethite, hematite, anatase, rutile, quartz, gregoryite, sulfate (thenardite and hexahydrite), diopside, feldspar, analcime, kaolinite and muscovite. Moreover, the in-situ Raman and MicroRaman measurements have been performed in order to compare the capabilities of the portable system specially focused for the next ESA Exo-Mars mission. The mineral detection confirms the sub-aerial alteration on the surface and the hydrothermal processes by the volcanic fluid circulations in the fresh part. Therefore, the secondary more abundant mineralization acts as the color agent of the rocks. Thus, the zeolite-illite group is the responsible for the bluish coloration, as well as the feldspars and carbonates for the whitish and the iron oxide for the redish parts. The XRD system was capable to detect a minor proportion of pyroxene, which is not visible by Raman and Mö ssbauer spectroscopy due to the ''Azulejos" alteration of the parent material on the outcrop. On the other hand, Mö ssbauer spectroscopy was capable of detecting different types of iron-oxides (Fe 3+/2+ -oxide phases). These analyses emphasize the strength of the different techniques and the working synergy of the three different techniques together for planetary space missions.

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“…In the former case, the high-amplitude motions of lithium cations are accompanied by rotations of [TO 4 ] tetrahedra, while such movements occur almost parallel to the S6R units, and are accompanied by the slight deformation of these units, in Na-LTA. In the Li-LTA FIR spectrum, the remaining IR-active modes below 170 cm −1 have very low intensities and correspond to lattice vibrations of nontetrahedral cations accompanied by [TO 4 ] tetrahedra rotations (T-O-T bending). Moreover, the Li-LTA structure is characterized by a lack of sublattice vibrations of Li + in S6R-2; such vibrations are present in the other Me-LTa systems (they yield the band at 41 cm −1 in the spectrum for Na-LTA).…”

Section: -O(t) Vibrations As Well As Changes In the Number Of Intensementioning

confidence: 99%

“…Vibrational spectroscopy is one of the most important experimental methods used in studies of zeolite structures [3][4][5][6][7][8][9][10]. It allows various frameworks to be identified and structural deformation to be specified using the envelope and integral intensities of bands in the pseudolattice region of the spectrum (linked to characteristic ring vibrations [11]).…”

Section: Introductionmentioning

confidence: 99%

Periodic model of an LTA framework

2015

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Zeolites are a group of microporous aluminosilicate frameworks with numerous applications in, for example, catalysis and ion-exchange and sorption processes. One of the most important tools for analyzing the properties of zeolite structures is vibrational spectroscopy. However, the complexity of these structures often leads to difficulties when attempting to interpret the resulting spectra, so an additional complementary tool is required: computational methods. The aim of this study was to formulate a simplified periodic model of an LTA framework containing alkali metal cations (either Li(+), Na(+), K(+), Rb(+), or Cs(+)) and to perform a set of ab initio calculations aimed at assessing the influence of these cations on the properties of the vibrational spectra of the LTA framework. Additionally, chemical bonding was analyzed by means of electron density topology analysis. Results obtained were compared with experimental spectra for alkali metal forms of zeolite A. It was found that the vibrational spectra obtained using the proposed model agree well with the corresponding experimentally derived spectra, meaning that the model can be used to analyze real spectra in detail.

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A vibrational spectroscopic study of the silicate mineral analcime – Na2(Al4SiO4O12)·2H2O – A natural zeolite

Cited by 11 publications

References 22 publications

Cold Plasma and Acid Treatment Modification Effects on Phonolite

Cold Plasma and Acid Treatment Modification Effects on Phonolite

Raman–Mössbauer–XRD studies of selected samples from “Los Azulejos” outcrop: A possible analogue for assessing the alteration processes on Mars

Periodic model of an LTA framework

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