DoomsdaysCW#Eggshells from agro-industrial waste for the recovery of #lime, #portlandite, and #calcite nanoparticles through the lime cycle: A circular economic approach
Highlights:
• The study proposes to obtain calcite (#CaCO3) from eggshell agro-industrial waste within a circular economy approach.
• The lime cycle can be used to transform calcite (CaCO3) into lime (CaO) or portlandite (Ca(OH)2).
• Eggshells contain trace elements that can aid in synthesizing materials for #EnvironmentalRemediation..
"Eggshells from agro-industrial waste can be used as natural source to obtain nanometric CaCO3, CaO, and Ca(OH)2 using the lime cycle. The nanometric size and the phase identification of all samples were confirmed by X-ray diffraction and FWHM. The SEM images show that CaCO3, CaO, and Ca(OH)2 from eggshells are microparticles in the form of nanocrystals, which correlate with the DLS results. The Zeta Potential varies due to the loss of CO2 when CaCO3 is converted in CaO, and for this reason, the CaO is more negative. When CaO is hydrated, the Ca(OH)2 is more stable, and these differences can be attributed to the mineral content in the samples. Eggshells naturally have different trace minerals that maintain a long calcium cycle and show variation due to a concentration effect when the CaCO3 changes to CaO. There is a notable a decrease of the trace minerals when CaO. When CaO is converted to Ca(OH)2, there is a significant decrease in trace minerals as some ions are soluble in the water during soaking. It is recommended to carry out the conversion of CaO to Ca(OH)2 under controlled conditions (low humidity and CO2). These findings can be useful to treat #AgroIndustrial waste and to develop nanotechnological applications in different fields."
Full article:
https://www.sciencedirect.com/science/article/pii/S2949839224000166
#SolarPunkSunday #CircularEconomy #ZeroWaste #NewTechnology #Remediation
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