The equilibrium biosorption isotherms showed that peanut shells possess high
affinity and sorption capacity for Cu(II) and Cr(III) ions, with monolayer sorption capacities of 25.39 mg Cu2+
and 27.86 mg Cr3+ per 1 g biomass, respectively. All results showed that peanut shells biomass is an
attractive, alternative low-cost biosorbent for removal of heavy metal ions from aqueous media.