Porous Glass Microspheres from Alkali-Activated Fiber Glass Waste

Mokhtar Mahmoud; Jozef Kraxner; Hana Kaňková; Miroslava Hujová; Si Chen; Dušan Galusek; Enrico Bernardo

doi:10.3390/ma15031043

Materials (Jan 2022)

Porous Glass Microspheres from Alkali-Activated Fiber Glass Waste

Mokhtar Mahmoud,
Jozef Kraxner,
Hana Kaňková,
Miroslava Hujová,
Si Chen,
Dušan Galusek,
Enrico Bernardo

Affiliations

Mokhtar Mahmoud: FunGlass, Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, 911 50 Trenčín, Slovakia
Jozef Kraxner: FunGlass, Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, 911 50 Trenčín, Slovakia
Hana Kaňková: FunGlass, Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, 911 50 Trenčín, Slovakia
Miroslava Hujová: FunGlass, Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, 911 50 Trenčín, Slovakia
Si Chen: FunGlass, Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, 911 50 Trenčín, Slovakia
Dušan Galusek: FunGlass, Centre for Functional and Surface Functionalized Glass, Alexander Dubček University of Trenčín, 911 50 Trenčín, Slovakia
Enrico Bernardo: Department of Industrial Engineering, University of Padova, 35131 Padova, Italy

DOI: https://doi.org/10.3390/ma15031043
Journal volume & issue: Vol. 15, no. 3
p. 1043

Abstract

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Fiber glass waste (FGW) was subjected to alkali activation in an aqueous solution with different concentrations of sodium/potassium hydroxide. The activated materials were fed into a methane–oxygen flame with a temperature of around 1600 °C. X-ray diffraction analysis confirmed the formation of several hydrated compounds, which decomposed upon flame synthesis, leading to porous glass microspheres (PGMs). Pore formation was favored by using highly concentrated activating alkali solutions. The highest homogeneity and yield of PGMs corresponded to the activation with 9 M KOH aqueous solution.

Published in Materials

ISSN: 1996-1944 (Online)
Publisher: MDPI AG
Country of publisher: Switzerland
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering; Technology: Engineering (General). Civil engineering (General); Science: Natural history (General): Microscopy; Science: Physics: Descriptive and experimental mechanics
Website: http://www.mdpi.com/journal/materials/

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