Table 1.

EFM adsorbent and raw materials used (magnetite, eggshell and fly ash)—specific surface area determinate by Brunauer–Emmett–Teller theory (BET).

Sample	Surface area (m2/g)	Average pore size diameter (nm)	Total pore volume (cm3/g)
Eggshell	0.67	24.534	0.011
Fly ash	4.961	8.993	0.020
Magnetite	17.8	3.7	0.044
M1	25.196	1.803	0.0003
M2	26.866	1.101	0.00011