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<p>Because of their distinct physicochemical characteristics, FAU zeolites are indispensable in a wide range of advanced technological sectors and have gained significant attention of researchers. In the present study, the process parameters for the hydrothermal synthesis of FAU zeolite from calcined illite (meta-illite) are optimized using the response surface methodology (RSM). Illitic Tunisian clay was used for preparing faujasite (FAU) type zeolite. It was activated and the synthesis was conducted via alkali fusion method. The Box-Behnken design was used to examine the optimum synthesis conditions. Unlike previous reports requiring temperatures above 90°C and longer durations (&gt;48h), this study demonstrates a successful synthesis of high-purity FAU zeolite at 65°C within 27 hours using Tunisian illite and optimized via RSM. Crystallization time was found to be the most crucial factor. The raw illite, meta-illite and prepared FAU-type zeolites were characterized by diverse analytical method such as TG-DSC, XRD, SEM-EDX, TEM, FT-IR and N<sub>2</sub> adsorption-desorption isotherms. A high pure FAU zeolites was synthesized under the optimal conditions with the SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub> ratio of 2.45, and the specific surface area of FAU zeolite was equal to 360 m<sup>2</sup>/g. The highly crystalline FAU zeolite was subsequently utilized in various applications, including wastewater treatment through adsorption and the photo-Fenton process, as well as in the capture of volatile organic compounds (VOCs) from the gas phase.</p> Graphical Abstract <p></p>

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Low-Temperature Synthesis of High-Pure Faujasite Zeolite from Raw Tunisian Clay: Application of Response Surface Statistical Optimization

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Olfa Ouled Ltaief,
  • Wiem Hamza,
  • Ilham Ben Amor,
  • Stéphane Siffert,
  • Mourad Benzina

摘要

Because of their distinct physicochemical characteristics, FAU zeolites are indispensable in a wide range of advanced technological sectors and have gained significant attention of researchers. In the present study, the process parameters for the hydrothermal synthesis of FAU zeolite from calcined illite (meta-illite) are optimized using the response surface methodology (RSM). Illitic Tunisian clay was used for preparing faujasite (FAU) type zeolite. It was activated and the synthesis was conducted via alkali fusion method. The Box-Behnken design was used to examine the optimum synthesis conditions. Unlike previous reports requiring temperatures above 90°C and longer durations (>48h), this study demonstrates a successful synthesis of high-purity FAU zeolite at 65°C within 27 hours using Tunisian illite and optimized via RSM. Crystallization time was found to be the most crucial factor. The raw illite, meta-illite and prepared FAU-type zeolites were characterized by diverse analytical method such as TG-DSC, XRD, SEM-EDX, TEM, FT-IR and N2 adsorption-desorption isotherms. A high pure FAU zeolites was synthesized under the optimal conditions with the SiO2/Al2O3 ratio of 2.45, and the specific surface area of FAU zeolite was equal to 360 m2/g. The highly crystalline FAU zeolite was subsequently utilized in various applications, including wastewater treatment through adsorption and the photo-Fenton process, as well as in the capture of volatile organic compounds (VOCs) from the gas phase.

Graphical Abstract