Structural, vibrational and morphological properties of layered double hydroxides containing Ni2+, Zn2+, Al3+ and Zr4+ cations
| Autor: | João Elias Figueiredo Soares Rodrigues, Elisabete Moreira Assaf, Débora Morais Bezerra |
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| Rok vydání: | 2017 |
| Předmět: |
Thermogravimetric analysis
Materials science Hydrotalcite 010405 organic chemistry Coprecipitation Mechanical Engineering Catalyst support Inorganic chemistry Layered double hydroxides 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Physisorption Mechanics of Materials Specific surface area engineering Physical chemistry General Materials Science 0210 nano-technology Mesoporous material |
| Zdroj: | Materials Characterization. 125:29-36 |
| ISSN: | 1044-5803 |
| DOI: | 10.1016/j.matchar.2017.01.015 |
| Popis: | Layered double hydroxides are anionic clays with formula [MII1 − x MIIIx(OH)2]q +[An −]q/n·mH2O, finding possible uses as catalyst support, adsorbents and so on. In this paper, we address the phase formation of layered double hydroxides containing Ni2 +, Zn2 +, Al3 + and Zr4 + cations, namely, NiZn-Al, NiZn-AlZr and NiZn-Zr compositions obtained by the coprecipitation method. Such systems were characterized by X-ray diffraction, confirming the phase formation for NiZn-Al and NiZn-AlZr samples. Infrared and Raman spectroscopies elucidated the anion and water molecules occurrence in the interlayer. Nitrogen physisorption (BET method) determined the presence of pores and specific surface area. The isotherm shapes were Type IV, according to the IUPAC, and represent a mesoporous structure. A morphological study was performed by means of scanning and transmission electron microscopies, and particle size values of 120, 131 and 235 nm for NiZn-Al, NiZn-AlZr and NiZn-Zr, respectively, were determined. Thermogravimetric analysis of the decomposition of the systems revealed that their complete disintegration occurred at ~ 450 °C and resulted in mixed oxides. |
| Databáze: | OpenAIRE |
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