Ftir and mössbauer investigation of a substituted palygorskite: Silicate with a channel structure

Augsburger, M. S.; Strasser, Edgardo N.; Perino, Ernesto; Mercader, R. C.; Pedregosa, J. C.

doi:10.1016/s0022-3697(97)00166-2

Cited by 97 publications

(46 citation statements)

References 15 publications

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“…The bands were dislocated when compared to the results of Augsburger et al 11 . The bands and the respective binding vibrations were: at 3614 cm …”

Section: Resultsmentioning

confidence: 60%

“…bending mode in water (coordinated water and adsorbed water); 1120 cm -1 , asymmetric mode of the terminal group O'-SiO 3 ; at 910 cm 11 , the band at 983 cm -1 is related to the asymmetric mode of the terminal group O'-SiO 3 . Another study found that the band at 960cm -1 could be attributed to Si-O-H vibration, present in activated palygorskite 22 .…”

Section: Resultsmentioning

confidence: 99%

“…Since the clay has a natural origin, the channels can be full of impurities. Moreover, other materials like quartz and carbonates can be aggregated 5,[9][10][11][12][13] . Palygorskite has been used in health care for different goals: purification of domestic water 4 ; in the formulation of intestinal adsorbents for toxic agents 14 ; cosmetics 15 ;…”

Section: Introductionmentioning

confidence: 99%

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The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design

et al. 2013

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Palygorskite is fibrous clay in which the structural tetrahedral and octahedral layers are organized in a way that structural channels are formed, leading to high surface area. However, impurities inside the channels and aggregated ones considerably reduce the available area. In order to increase the surface area, an activation treatment can be considered useful. The goal of this work is the activation of palygorskite from Guadalupe, Piauí, via sulfuric acid treatment using a two-level factorial design. The influence of three parameters (solution molarity, temperature and time) on BET surface area was determined. Moreover, samples were characterized via X-ray diffraction (XRD) and fluorescence (XRF), Fourier-transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The largest surface area (282 m 2 /g) without considerable changes in clay structure and morphology was found in a sample treated with 5M H 2 SO 4 at 70°C for 1h. The main parameters that favored the improvement of the surface area were the solution's molarity, temperature and their interaction.

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“…The bands were dislocated when compared to the results of Augsburger et al 11 . The bands and the respective binding vibrations were: at 3614 cm …”

Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design

et al. 2013

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“…This peak is not present in the LIS sample, while in the TOR sample it appears with the highest intensity. Mendelovici (1973) found a peak at 3590 cm 1 which shifts to 3570 cm 1 on heating, and Shuali et al (1987) and Augsburger et al (1998) assigned the weak band at 3580 cm 1 to coordinated water molecules in the channels. Sema et al (1977) attributed this band to Al-Fe 3+ -OH or Al-Mg-OH bonds, while Chahi et al (2002), based on comparison with smectite, attributed it to Al-Fe-OH stretching.…”

Section: Oh-stretching Vibration Regionmentioning

confidence: 99%

FTIR spectroscopic study of palygorskite: Influence of the composition of the octahedral sheet

Suárez

Romero

2006

Applied Clay Science

261

108

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The influence of chemical composition to position and intensity of the absorption bands observed in the FTIR spectra of palygorskite has been studied by a detailed comparative study of six samples. Palygorskites studied have high purity and different chemical composition. At one extreme, there are two samples that correspond to Mg-rich palygorskites, at the other extreme a sample with a composition very close to the theoretical formula of this mineral, and there are three further samples whose structural formulae lie between these extremes. The position of the bands identified in the FTIR spectra of the palygorskites studied is similar for all samples, but there are some differences in their intensity, which are significant. Analysing these intensities, valuable information about the distribution of cations along the octahedral sheet has been obtained. Isomorphic substitution in octahedral sheet occurs only in M2 position. AI, and Fe may occupy M2 position whereas Mg can occupy all possible sites: MI, M2 and M3.

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“…The band itself is attributable to interstitial H 2 O and (Si)O-H groups in differing structural environments [52] and clearly varies with Fe content. The sharp band located at ∼1650 cm −1 is due to the H-O-H bending mode of coordinated and/or adsorbed water [53], while the band at ∼5150 cm −1 is a combination band of molecular water [54,55]. Annealing at 450 • C reduces the 3500 cm −1 band strength by ∼30% with similar behaviour for the 1650 and 5150 cm −1 bands (Fig.…”

Section: Anp Hydrationmentioning

confidence: 64%

Amorphous silicate nanoparticles with controlled Fe-Mg pyroxene compositions

Thompson

Demyk

Day

et al. 2016

Journal of Non-Crystalline Solids

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The production of amorphous pyroxene nanoparticles (∼20 nm) with controlled Fe-Mg content is described. Homogenous particle compositions closely matching required target stoichiometries are obtained by drying a precursor gel under high vacuum conditions. The silicate nature of the particles is characterised using TEM, synchrotron radiation and FTIR. No oxide phase separation occurs, even at high Fe concentration. Structural domains exist within the nanoparticles that are typically ten times smaller than the physical particle size consistent with either a core-shell, or random network with multiple embedded domains, particle structure. Thermal annealing below the crystallisation temperature allows the ordered domain size to be further * Corresponding author reduced by a factor of ∼2.

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Ftir and mössbauer investigation of a substituted palygorskite: Silicate with a channel structure

Cited by 97 publications

References 15 publications

The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design

The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design

FTIR spectroscopic study of palygorskite: Influence of the composition of the octahedral sheet

Amorphous silicate nanoparticles with controlled Fe-Mg pyroxene compositions

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