Comparative Fourier Transform Infrared and X-Ray Powder Diffraction Analysis of Naturally Occurred K-Feldspars

Theodosoglou, Eleni; Koroneos, A.; Σολδάτος, Τ.; Zorba, T.; Paraskevopoulos, K. M.

doi:10.12681/bgsg.11681

Cited by 40 publications

(39 citation statements)

References 10 publications

(17 reference statements)

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“…3. All the samples show a broad, intense absorption band with a maximum at 1030 cm −1 associated with the Si-O stretching vibrations (Theodosoglou et al 2010;Hsiao et al 2017;Sidorenko et al 2018).…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Reinoso

Angeletti

Cervellini

et al. 2020

Braz. J. Chem. Eng.

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This paper aims to characterize a natural sediment from Bahía Blanca estuary (Argentina) as a new clay source and determine the catalytic capacity after its structural modification by an acid activation process. The acid treatment was performed by employing H 2 SO 4 at different concentrations at 353 K and 60 min. The raw material and acid-activated samples were characterized by XRD, XRF, FTIR, N 2 physisorption, TGA, SEM, EDX, potentiometric titration and pyridine adsorption monitored by FTIR. Moreover, the catalytic activity on lauric acid esterification with methanol was evaluated as a test reaction. From the structural characterization, it was determined that the material studied contains mainly Ca-montmorillonite, illite, albite and quartz. Likewise, the results obtained showed that the acid-treatment impacts the material characteristics, predominantly surface acidity and textural properties. Particularly, it was evidenced that the samples treated under medium acid activation conditions lead to an increase in acid site number and strength and specific surface area and consequently improve the catalytic activity. The results obtained evidenced that this low cost and widely available raw material presents an interesting mineralogical composition with a high clay mineral content. Additionally, the catalytic performance showed a good conversion in the test reaction regarding other heterogeneous catalysts. Hence, considering these results, this natural sediment merits further research on its purification and application.

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Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Reinoso

Angeletti

Cervellini

et al. 2020

Braz. J. Chem. Eng.

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“…The Si O stretching bands in the 1120-1000 cm −1 and the Al O bending at 915 cm −1 are characteristic of aluminosilicate minerals. The doublet at 800-780 cm −1 and the 720-500 cm −1 zone are respectively due to quartz and feldspar admixtures in the clayey material [20][21][22]. The scanning electron microscope SEM) enabled the observation of the platy-like appearance characteristic of kaolinite [23,24] and locally honeycomb aspect of very thin flakes of extremely small particle size, usually observed for smectite and illite [23,25] in the clayey material (Fig.…”

Section: Mineralogymentioning

confidence: 99%

The Ndop plain clayey materials (Bamenda area – NW Cameroon): Mineralogical, geochemical, physical characteristics and properties of their fired products

Yongue-Fouateu

Ndimukong

Njoya

et al. 2016

Journal of Asian Ceramic Societies

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a b s t r a c tThe physicochemical, mineralogical and technological properties of clayey materials from the Ndop plain (NW Cameroon) have been investigated, for their ceramic applications. The clayey materials have mixed facies with colour ranging from brown, grey, mottled and yellowish brown. The thickness of the exploitable clay layer is more than 5 m. Their mineralogical constituents are quartz, kaolinite, illite and feldspars, with kaolinite as major clay mineral. Based on the geochemistry, their source rocks might be felsic, with a mafic rock inference. These materials display high percentage in fine particles and high Atterberg limits. For all the firing temperatures, flexural strength (1.2-11 MPa), water absorption (8.03-24.27%), linear shrinkage (2.10%), weight loss (4.88-16.54%) and bulk density (1.57-2.03 g/cm 3 ) indicate good ceramic properties for firing samples between 900 and 1100 • C. Most of the fired test bricks show a brick red colour with good to very good cohesion. The studied clays were thus, suitable as raw materials for roof tiles, light weight blocks and hollow bricks; however, mixing of high clayey and highly silty materials could improve the quality of the products.

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“…The band located at ~429 cm −1 is due to deformation of O–Si–O bond. K–O stretching is observed at around ~467 cm −1 , which is also coupled with Si–O–Si bending vibration . Saikia et al., also, declare that Fe bearing bonds such as Fe–O are located approximately at around ~532 cm −1 .…”

Section: Resultsmentioning

confidence: 94%

“…Absorption at ~776 cm −1 is correlated with Si–O–Si stretching vibration of quartz . Absorptions located in the range of 1000‐1150 cm −1 are ascribed to Si–O stretching vibrations and the maximum absorption, which is seen at around ~1036 cm −1 is due to the stretching vibration of Si–O bonds . At FTIR spectra of minerals, O–H bonds usually fall in the range of 1600‐3700 cm −1 .…”

Section: Resultsmentioning

confidence: 98%

In situ synthesis of leucite‐based feldspathic dental porcelain with minor kalsilite and Fe₂O₃ impurities

Salimkhani

Fesaghandis

Salimkhani

et al. 2018

Int J Applied Ceramic Tech

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K-Feldspar was used as a raw material for in situ synthesis of leucite particles by solid-state reaction method. Prior to synthesis of leucite, K-Feldspar was treated by oxalic acid (C 2 H 2 O 4 ) to eliminate Fe content. The parameters affecting the structure and amount of Fe in K-Feldspar was investigated to reach an optimal leaching condition. Next, kasilite removal was studied by introducing CaF 2 to the composition of dental porcelain. To synthesis leucite, the prepared materials were heated up to 1450°C for 3 hours until fusion phenomena occurred, then cooled down to 865°C to permit the leucite crystals nucleate and grow. To find out the chemical composition of powder, XRF, EDX, and Atomic absorption spectroscopy were used. Fourier Transform Infrared Spectroscopy and X-Ray Diffractometer and Scanning Electron Microscopy were employed to study the structure of mineral. Spectrophotometry was chosen to analyze whiteness index of powder after acid treatment. Differential Thermal Analysis was employed to determine the crystallization temperature. Results indicated a dramatic decrease in Fe content (0.018%wt) by employing C 2 H 2 O 4 as a leachant at 50°C. In addition, whiteness index of 91% was achieved through this procedure for raw feldspar. Finally, 1% wt of CaF 2 prevented formation of kalsilite.

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Comparative Fourier Transform Infrared and X-Ray Powder Diffraction Analysis of Naturally Occurred K-Feldspars

Abstract: Natural K-feldspars from igneous rocks have been examined by means of X-ray powder diffraction (XRPD) and Fourier transform infrared (FTIR) spectroscopy in the spectral

Cited by 40 publications

References 10 publications

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

The Ndop plain clayey materials (Bamenda area – NW Cameroon): Mineralogical, geochemical, physical characteristics and properties of their fired products

In situ synthesis of leucite‐based feldspathic dental porcelain with minor kalsilite and Fe₂O₃ impurities

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Comparative Fourier Transform Infrared and X-Ray Powder Diffraction Analysis of Naturally Occurred K-Feldspars

Abstract: Natural K-feldspars from igneous rocks have been examined by means of X-ray powder diffraction (XRPD) and Fourier transform infrared (FTIR) spectroscopy in the spectral

Cited by 40 publications

References 10 publications

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

Study of structural properties of acid-treated natural sediment and its application as a sustainable catalyst

The Ndop plain clayey materials (Bamenda area – NW Cameroon): Mineralogical, geochemical, physical characteristics and properties of their fired products

In situ synthesis of leucite‐based feldspathic dental porcelain with minor kalsilite and Fe2O3 impurities

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In situ synthesis of leucite‐based feldspathic dental porcelain with minor kalsilite and Fe₂O₃ impurities