Crystal chemical and Ssructural characterization of natural and cation-exchanged mexican Erionite
| Autor: | Alessandro Pacella, Marcos Esparza-Schulz, Carlos Felipe, Paolo Ballirano, Karla Quiroz-Estrada, Miguel Ángel Hernández-Espinosa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Mineralogy
lcsh:QE351-399.2 Ion exchange Rietveld refinement Analytical chemistry Geology 02 engineering and technology fibrous erionite rietveld refinement SEM-EDX analysis 010402 general chemistry 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Erionite 01 natural sciences 0104 chemical sciences Characterization (materials science) Crystal chemistry.chemical_compound Adsorption chemistry Fiber 0210 nano-technology Zeolite |
| Zdroj: | Minerals Volume 10 Issue 9 Minerals, Vol 10, Iss 772, p 772 (2020) |
| Popis: | In this work, the chemical structural characterization of the erionite-type zeolite from Agua Prieta, Sonora, Mé xico, was performed on both pristine and Na, Ca, and Mg exchanged samples in order to identify the various modifications due to cation exchange. The samples investigated were those that showed the best behaviour of CO2 and CH4 adsorption at zero coverage levels and the higher values of surface area reported in our previous studies. According to the crystal-chemical formula (Na3.44K1.96Mg0.63Ca0.62)[Al8.21Si27.79O71.85]· 29.63H2O, the pristine sample has been classified as erionite-Na. Morphological FE-SEM investigation performed on both pristine (ERIN) and Na-exchanged samples (ERINa3) showed a similar range of fiber diameters (27&ndash 37 nm). The chemical analyses of the ion-exchanged samples evidenced the upload of Ca and Mg following ion exchange with Na. Rietveld analysis results allowed the identification of the chemical structural modification caused by the ion exchange process, occurring mainly at the Ca1 site. |
| Databáze: | OpenAIRE |
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