Use of eggshell waste: A green and effective method for the synthesis of pure calcium hydroxide suspensions
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Lanzón Torres, Juan Marcos; Madrid Mendoza, Juan Antonio; Navarro Moreno, David; García Vera, Victoria EugeniaÁrea de conocimiento
Construcciones ArquitectónicasFecha de publicación
2023-05-09Editorial
ElsevierCita bibliográfica
Marcos Lanzón, Juan A. Madrid-Mendoza, David Navarro-Moreno, Victoria E. García-Vera, Use of eggshell waste: A green and effective method for the synthesis of pure calcium hydroxide suspensions, Construction and Building Materials, Volume 377, 2023, 131106, ISSN 0950-0618, https://doi.org/10.1016/j.conbuildmat.2023.131106.Revisión por pares
siPalabras clave
EggshellCalcium hydroxide
Nanoparticles
Consolidation
Architectural materials
Waste
Resumen
This paper presents a rapid method to obtain pure suspensions of Ca(OH)2 dispersed in 2-propanol. To this aim eggshell wastes (CaCO3) were decarbonated to calcium oxide (CaO) followed by sonication-assisted hydrolysis in water/2-propanol to form calcium hydroxide (Ca(OH)2). An important advantage of the method is that it does not require chemical reagents due to the high purity of eggshell in CaCO3. Moreover, CaO is fully converted into Ca(OH)2 which means that purification steps are not needed, as occurs in conventional routes of synthesis. To assess the reliability of the synthetic procedure, the purity and amount of Ca(OH)2 were studied by X-ray diffraction (XRD), infrared spectroscopy (FTIR) and thermal analysis (TG). In addition, the morphology and crystallite size were examined by transmission electron microscopy (TEM) and X-ray diffraction (XRD) using Rietveld refinement method. It was found that sonicated Ca(OH)2 suspensions (5 g/L) were composed of particles that ranged in size ...
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