ABSTRACT
Adsorption is a surface occurrence that involves the accumulation of atoms, molecules, or ions at the surface of a solid phase. It is a mass transfer process leading to the sorption of gases or solutes by solid or liquid surfaces. Biosorbents are biomass-based substances that use preferential adsorption to move adsorbate molecules from the bulk liquid phase to their surfaces. They have been recognized as viable options for eliminating pollutants from wastes. Different types of biomass cannot be used directly as biosorbent materials. In the raw materials there is not much sorption capacity for metal removal The materials must be pretreated to increase their capacity and usefulness. This chapter mainly focuses on different pretreatment methods used for the enhanced sorption aictivity of sorbents for the removal of pollutants from the environment.
