From this study, it can be concluded that, ease and simple
pretreatment of the inexpensive biosorbent made of orange peel
biomass show high-sorption performance of heavy metals and high
feasibility of desorption and regeneration of sorption capacity.
Moreover, a comparison of different isotherm models revealed that
the modified biosorption data perfectly fitted the Langmuir and
Freundlich adsorption isotherms models with regression coefficient
R2 > 0.95 for all the studied metal ions. The modified biosorption
kinetic studies indicated that the experimental data
followed the second-order kinetic reaction. These appropriate
features will contribute to the reuse of this orange peel biomass as
a novel biosorbent material in practical application for removal of
heavy metals from industrial wastewater.