Spectroscopic Analysis of Heterogeneous Biocatalysts for Biodiesel Production from Expired Sunflower Cooking Oil

Figure 2

Raw FTIR spectra of eggshells calcinated at different temperatures of 500 (B), 600 (C), 700 (D), 800 (E), 900 (F), and 1000°C (G). Uncalcinated egg shell (A) was used as control. Gradual decomposition of carbonates (a) occurred with increasing calcination temperature, leading to inclinations in spectra of (E), (F), and (G) as seen in (b) due to emergence of calcium oxide bond.