Extent of zeolite synthesis via alkaline fusion from tailings dam sediments

Andrade, Fábio Ramos Dias de; Yogi, M. T. A. G.; Gomes, Elton Barbosa; Shinzato, Mirian Chieko

doi:10.1007/s12665-020-09118-9

Cited by 8 publications

(2 citation statements)

References 44 publications

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“…It was reported that the main methods of zeolite synthesis are conventional hydrothermal action, fusion, ultrasonic or microwave treatments [4] , [5] , [6] . Very often the combination of above-mentioned methods was used as well.…”

Section: Introductionmentioning

confidence: 99%

Conversion of silica by-product into zeolites by thermo-sonochemical treatment

Vaičiukynienė

Jakevicius

Kantautas

et al. 2021

Ultrasonics Sonochemistry

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Section: Introductionmentioning

confidence: 99%

Conversion of silica by-product into zeolites by thermo-sonochemical treatment

Vaičiukynienė

Jakevicius

Kantautas

et al. 2021

Ultrasonics Sonochemistry

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“…This is also confirmed by FTIR spectroscopy data, where a decrease in the intensity of signals associated with OH-groups is observed in the FAU-450 sample. The mass loss occurs in several steps and is related to the removal of physisorbed water at temperatures below 150 °C, manifested in the DTA plot as an endothermic peak at about 80 °C; water bound to the zeolite framework between 100-250 °C, shown as an endothermic peak on the DTA graph at about 150 °C, and, finally, slow desorption of more tightly bound water molecules from the zeolite, shown as an endothermic shoulder on the DTA graph at about 300 °C [49][50][51].…”

Section: Thermal Propertiesmentioning

confidence: 99%

Additive-free synthesis of layer-like Faujasite-type zeolite X

Koop-Santa,

Yocupicio-Gaxiola,

Murrieta-Rico

et al. 2024

J Mater Sci

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Faujasite-type zeolite X (FAU-X) with a layered morphology was successfully synthesized by an additive-free route at a crystallization temperature of 90 °C for 24 h. The sample was dried at 70 °C for 40 h (designated FAU) and then calcined at 450 °C for 5 h (designated FAU-450). Both samples were analyzed by X-ray diffraction (XRD), which confirmed the formation of the FAU structure. In addition, from the XRD data and Energy Dispersive Spectroscopy, the Si/Al ratio was determined to be ~ 1.20, which is typical for FAU-X zeolite. Scanning Electron Microscopy revealed that both samples have morphologies corresponding to sheet agglomerate, with FAU-450 having an agglomerate size of 1.41 µm and a sheet thickness of about 0.13 µm. These values are close to the data obtained by transmission electron microscopy, where an agglomerate size of ~ 1.39 µm and a sheet thickness of ~ 0.12 µm were observed. From the Tauc’s plots for FAU and FAU-450, the values of direct and indirect band gaps were determined and found to be close for both samples. In the case of FAU-450, values of 4.35 eV and 3.12 eV were obtained for the direct and indirect transition, respectively. From the TGA/DTA data, it was found that FAU loses mass due to dehydration of the zeolite at temperatures below 350 °C, while the sample is structurally stable up to 700 °C. Graphical Abstract

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Phase transition pathway of hydrothermal zeolite synthesis

Chen

Hsu

2021

Phys Chem Minerals

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Extent of zeolite synthesis via alkaline fusion from tailings dam sediments

Cited by 8 publications

References 44 publications

Conversion of silica by-product into zeolites by thermo-sonochemical treatment

Conversion of silica by-product into zeolites by thermo-sonochemical treatment

Additive-free synthesis of layer-like Faujasite-type zeolite X

Phase transition pathway of hydrothermal zeolite synthesis

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