Biosorption of Lanthanides from Aqueous Solutions Using Pretreated Buccinum tenuissimum Shell Biomass

Table 2

The crystal structures and the specific surface areas of four kinds of sieved Buccinum tenuissimum shell biomass.

Sample	Main crystal structure	Specific surface area
(a) Ground original; sample	Aragonite; (CaCO3)	3.31 m^2/g (BET); 5.35 m^2/g (Langmuir)
(b) Heat-treatment; (480°C) sample	Calcite; (CaCO3)	0.390 m^2/g (BET); 0.612 m^2/g (Langmuir)
(c) Heat-treatment; (950°C) sample	Lime syn.; (CaO)	1.88 m^2/g (BET); 3.10 m^2/g (Langmuir)
(d) Heat-treatment; (950°C) and water added sample	Portlandite; (Ca(OH)2)	6.37 m^2 /g (BET); 9.91 m^2/g (Langmuir)