Abstract
This work reports the effect of the microwave power on the synthesis of Na-zeolite and / or hydroxysodalite from a natural kaolinite. The kaolin was fired in a muffle furnace for 1 h at 650 ° C and the obtained metakaolin was dispersed in 8 N sodium hydroxide solution for a microwave assist hydrothermal synthesis of zeolites. The products were analyzed using powder X-ray diffraction (XRD), Fourier Transform Infrared(FTIR) and Differential Scanning Calorimetry (DSC) and Scanning Electron Microscope (SEM). XRD patterns and FTIR spectra evidenced the formation of new phases identified as type A Na-Zeolite and hydroxysodalite. The type A Na-Zeolite is formed under the application of microwave of power less than 320 W and beyond this power hydroxysodalite is the dominant phase. DSC curves show an increase in the hydration water, which is associated to an increase in the porosity that favors water uptake. SEM observations show obvious morphological changes that are in line with the conversion of the starting metakaolin into zeolitic phases. It is evidenced that, for a fixed application time, the structure of the zeolitic material formed is dependent on the power of the microwave used. Under the time condition used here (10 min), energies between 160 and 320 W, favored the formation of Na-zeolite while the formation of hydroxysodalite is favored for energies greater than 320 W.
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22 August 2023
A Correction to this paper has been published: https://doi.org/10.1007/s42250-023-00758-5
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The authors are grateful to the Cameroon Government for the special research allowance to Researcher Staffs of State Universities; The Polytechnic University of Man in Ivory Coast is acknowledged for the SEM analyses.
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Kwimi Tchatat, P., Ngally Sabouang, C.J., Mache, J.R. et al. Microwave Assist Synthesis of Na-zeolite/Hydroxysodalite from a Kaolin: Effect of the Microwave Power. Chemistry Africa 7, 273–280 (2024). https://doi.org/10.1007/s42250-023-00745-w
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DOI: https://doi.org/10.1007/s42250-023-00745-w