| Title | Zeolitization of Diatomite Residues by a Simple Method |
|---|---|
| ID_Doc | 19971 |
| Authors | Moreno-Maroto, JM; Alonso-Azcárate, J; Martínez-García, C; Romero, M; López-Delgado, A; Cotes-Palomino, T |
| Title | Zeolitization of Diatomite Residues by a Simple Method |
| Year | 2022 |
| Published | Applied Sciences-Basel, 12.0, 21 |
| Abstract | The possibility of transforming a diatomite-rich waste from the brewing industry into synthetic zeolites has been investigated. After precalcination at 550 degrees C to eliminate the retained organic matter, the clean diatomite (Dt; with a Si/Al molar ratio of 17.4), was hydrothermally treated for 24 h with continuous stirring in a 3M NaOH solution at 80 degrees C. The results of mineralogical characterization by X-ray diffraction with Rietveld refinement have shown a crystallization of 55% of zeolite P, which was neoformed from the amorphous phase, opal-CT and quartz of the starting sample. The spectra obtained by Fourier Transform Infrared Spectrometry have corroborated such zeolitization. N-2 adsorption-desorption isotherms have shown that the zeolitized material (Dt-Z) is mesoporous, with almost 60% more specific surface area than Dt (62.6 m(2)/g vs. 39.4 m(2)/g), greater microporosity and 40% smaller average pore size than Dt (71 angstrom vs. 118 angstrom). This study is a first approximation to know the potential of diatomite wastes as zeolite precursors, for which additional research including an aluminum source will be required. |
| https://www.mdpi.com/2076-3417/12/21/10977/pdf?version=1667886281 |
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