Ceramic foam decorated with ZnO for photodegradation of Rhodamine B dye

Eggshells as agro‐industrial waste substitute for CaCO3 in glass foams: A study on obtaining lower thermal conductivity

“…Figure 1 shows the thermogravimetry and differential thermal analysis (TGA/DTG) conducted to investigate the thermal stability of the ES powder. The presence of three zones of mass loss can be observed: (i) up to 250°C, associated with the loss of the adsorbed water; (ii) in the interval between 300 and 600°C, related to the decomposition of organic matter; and (iii) between 670 and 800°C (a mass loss of over 50%), attributed to the decomposition of CaCO 3 23 . This mass loss coincides with an intense endothermic event with a maximum at 800°C.…”

“…This mass loss coincides with an intense endothermic event with a maximum at 800°C. The CaCO 3 decomposition can be explained by Equation .Above ~800°C, CaO is the predominant compound 23 …”

“…That last compound can be found in food industry waste, such as in eggshells 21 . The amount of eggs produced worldwide was of 76.700,56 metric tons in 2018 23 . In Brazil, this number was approximately 2.9 × 10 6 tons in 2018 24 .…”

Influence of processing parameters on the microstructure of the eco‐friendly glass foam

“…23 Table S1 shows the chemical composition of feedstock determined by X-ray fluorescence. 24 The FLGR chemical composition was characterized by the predominance of Si, Ca, and Na, which is typical for soda-lime glass. The white eggshell was characterized by the predominance of Ca (about 97.5% of Ca compounds), which is also confirmed by the calcite (CaCO 3 ) pattern (JCPDS Card 00-005-0586) observed by XRD measurement (Figure S1).…”

“…The strong weight loss between approximately 640 and 755°C is related to the decomposition of CaCO 3 , that is, CaCO 3 (s) → CaO (s) + CO 2 (g). 24 For eggshells, above 800°C only ashes and inorganic compounds remain, besides CaO being stable and ceasing weight loss. 25 Dilatometry analysis of the FLGR (Figure 1, blue line) showed that T d is around 580°C (the viscous flow sintering is experienced at a temperature about 100°C above the dilatometric softening point 11 ).…”