Thermal and cation influence on ir vibrations of modified natural clinoptilolite

Rodrı́guez-Fuentes, G.; Ruiz‐Salvador, A. Rabdel; Mir, Mohammad Hedayetullah; Picazo, Oscar; Quintana, Geraldine Ezquerra; Delgado, M.

doi:10.1016/s1387-1811(97)00013-9

Cited by 51 publications

(23 citation statements)

References 14 publications

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“…The relative intensity of some zeolite bands changed moderately after HT, which can be associated with the ion exchange process. The changes observed in the relative transmittance of the 1205 and 456 cm−1 vibration bands are the same as reported by Rodríguez et al [15] for this zeolite as a consequence of the partial exchange of Ca2+ by Na+ in NZ. These results agree well with those obtained via XRD.…”

Section: Methodssupporting

confidence: 89%

Characterization and neutralizing properties of a natural zeolite/Na2CO3 composite material

Rivera

Rodrı́guez-Fuentes

Altshuler

1998

Microporous and Mesoporous Materials

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A new zeolitic active principle called NZ* has been obtained, the neutralizing properties of which are better than those of its predecessor, Neutacid N. The new product is the result of hydrothermal transformations applied to purified natural clinoptilolite. NZ* and other related products have been characterized physically and chemically using atomic emission spectroscopy with inductively coupled plasma, X-ray fluorescence analysis, X-ray diffraction, IR spectroscopy, neutralizing capacity in the presence of synthetic gastric juice and UV spectroscopy. It was demonstrated that the structure of the zeolitic raw mineral remained unchanged after hydrothermal transformation, and that NZ* is structurally stable after interaction with synthetic gastric juice. The effect of NZ* dose on the gastric enzyme pepsin was evaluated.

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Section: Methodssupporting

confidence: 89%

Characterization and neutralizing properties of a natural zeolite/Na2CO3 composite material

Rivera

Rodrı́guez-Fuentes

Altshuler

1998

Microporous and Mesoporous Materials

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“…The strongest band observed at ca. 1055 cm Ϫ1 was assigned to asymmetric stretching of the external tetrahedral linkages (Rodriguez-Fuentes et al 1998). The second strongest band at ca.…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…A comparison of the spectra of all the samples showed that there were no significant differences between them. Peaks at 1060 cm Ϫ1 , 790 cm Ϫ1 and 609 cm Ϫ1 were characteristic of clinoptilolite (Çaglar et al 2007;Rodriguez-Fuentes et al 1998). The strongest band observed at ca.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Adsorption of Sulphur Dioxide Using Natural and Modified Gördes Clinoptilolites

Alver

Sakizci

Yörükoğullari

2011

Adsorption Science & Technology

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ABSTRACT:The adsorption of SO 2 onto clinoptilolite-rich zeolite tuff from Gördes (Turkey) (natural-G) and its cation-exchanged (Na ) forms was investigated up to 100 kPa pressure at two different temperatures (273 K and 293 K). The structural properties of the clinoptilolites were studied by X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectroscopy. Quantitative XRD analysis showed that the major component of the natural-G sample was clinoptilolite, together with minor amounts of feldspar, opal-CT, smectite, mica-illite and amorphous material (opal-A).

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“…It is reported that IR bands in the 420-500 cm -1 region and those between 520 and 600 cm -1 are assigned to internal tetrahedron vibrations such as 6-and 5-rings of T-O-T (T = Si or Al) in zeolites [28]. These IR bands for clinoptilolite and zeolite-P were observed between 430 and 604 cm -1 [29,30].…”

Section: Structural Parametersmentioning

confidence: 99%

Synthesis of MCM-41 with Zeolite-P from Natural Clinoptilolite for Silica-alumina Source Under Hydrothermal Conditions in Alkaline Media

Shindo

Nagai

Ikeuchi

et al. 2011

Int.J.Soc.Mater.Eng.Resour.

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Mesoporous molecular sieve MCM-41 and zeolite-P were synthesized from natural clinoptilolite zeolite and cetyltrimethylammonium bromide under hydrothermal conditions in alkaline media. The formation path of MCM-41 and zeolite-P from natural clinoptilolite was investigated using XRD, TG, SEM, and FT-IR for the samples obtained in the course of the synthesis. XRD and TG results exhibited that in the first stage where the mixture of clinoptilolite and cetyltrimethylammonium bromide was treated in alkaline media at ambient temperature, crystal structure of clinoptilolite did not change significantly. In the second stage where the mixture was subsequently treated under hydrothermal conditions, dissolution of clinoptilolite and formation of zeolite-P were observed, while mesophase with 2d hexagonal structure of MCM-41 was not detected. In the third stage, mesostructure with 2d hexagonal symmetry was gradually formed by the adjustment of pH of the reaction mixture between 10.5 and 8.5. Structural integrity of 2d hexagonal assembly of as-synthesized MCM-41 was improved by controlling pH of the reaction mixture to 8.5 followed by the hydrothermal treatment. In contrast, the structure of zeolite-P was not affected by these treatments. SEM images of the samples showed that small particles of MCM-41 were mainly formed on the surface of the zeolite-P particles and agglomerated to larger grains. Judging from the results of XRD patterns and FT-IR spectra of the samples, it is indicated that smaller crystallites or building units of clinoptilolite that were X-ray amorphous and IR detectable were probably incorporated in the pore walls of MCM-41.

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Thermal and cation influence on ir vibrations of modified natural clinoptilolite

Cited by 51 publications

References 14 publications

Characterization and neutralizing properties of a natural zeolite/Na2CO3 composite material

Characterization and neutralizing properties of a natural zeolite/Na2CO3 composite material

Adsorption of Sulphur Dioxide Using Natural and Modified Gördes Clinoptilolites

Synthesis of MCM-41 with Zeolite-P from Natural Clinoptilolite for Silica-alumina Source Under Hydrothermal Conditions in Alkaline Media

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