Figure 3
The appearance of eggshells that were calcined under different conditions. (A) Calcined for 4 h at different temperatures; (B) calcined for 2–4 h at 700 °C; and (C) calcined for 2–4 h at 900 °C.
Figure 3 | Scientific Reports
The appearance of eggshells that were calcined under different conditions. (A) Calcined for 4 h at different temperatures; (B) calcined for 2–4 h at 700 °C; and (C) calcined for 2–4 h at 900 °C.
