Synthesis and Physico-Chemical Characterization of Biomaterial CaO Obtained from Chicken Egg Shells

• Autor(a) principal: Alencar, Angélica Oliveira de
• Data de Publicação: 2022
• Outros Autores: Moura, Taffarel Eloi de, Fernandes, Pollyana Caetano Ribeiro, Leal, Elvia, Dantas, Joelda
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Research, Society and Development
• Texto Completo: https://rsdjournal.org/index.php/rsd/article/view/30807
• topic: Cascas de ovos; Carbonato de cálcio; Calcinação; Óxido de cálcio; Biomaterial.; Eggshells; Calcium carbonate; Calcination; Calcium oxide; Biomaterial.; Cáscaras de huevo; Carbonato de calcio; Calcinación; Óxido de calcio; Biomaterial.

The high consumption of chicken eggs produces tons of eggshells daily, generating a serious environmental problem, since they are improperly disposed of in sanitary landfills. This residue is mostly composed of calcium carbonate (CaCO3), a precursor for obtaining calcium oxide (CaO). Thus, this work aimed to obtain CaO from hen eggshells in order to confirm its characteristics as a biomaterial due to structural, chemical and thermal analysis for industrial purposes, which can be applied in the area of ​​catalysis. For this, the samples were calcined at different temperatures (650, 700, 800 and 900 °C) with a residence time of two hours. The in natura and synthesized samples were analyzed by XRD, FTIR and TGA/DrTGA. The diffractograms confirmed the presence of CaCO3 as the main phase for the in natura eggshells, and for the samples calcined at different temperatures, CaO was formed as the main phase. The absorption bands showed the appearance of Ca-O binding for all calcined samples. In addition, for those subjected to 650 and 700 °C, C-O absorption bands were also found, attributed to the presence of CaCO3. The thermogravimetric curves, in turn, showed that all calcined samples were characterized as stable, as they did not present significant variation in their respective masses as a function of the programmed time and temperature. Thus, this residue is an excellent alternative and sustainable source for the production of CaO as a biomaterial.