New Sustainable Biosorbent Based on Recycled Deoiled Carob Seeds: Optimization of Heavy Metals Remediation

Table 2

Chemical groups on the surface of the biosorbents.

Biosorbent	Carboxylic groups (meq/g)	Lactonic groups (meq/g)	Phenolic groups (meq/g)	Total acid groups (meq/g)	Total basic groups (meq/g)
Raw-seeds	0.4070	0.4880	0.4900	1.3850	0.3750
HCl-seeds	0.3810	0.5150	0.5240	1.4200	0.3650
NaOH-seeds	0.4090	0.4830	0.4990	1.3910	0.3870