In the search for cost-effective materials able to remove heavy metals pollutants from aqueous solution, fruit peel emerges as an attractive source of biomass with remarkable adsorption properties.In this work, orange peel biomass was used to study the chromium uptake during sorption-desorption cycles.The cement-based immobilization technique was also applied for further biosorbent disposal.The biomass was characterized before and after adsorption via Fouriertransform infrared spectroscopy (FT-IR) analysis.The experiments were conducted in batch mode at fixed pH (2), contact time (5 h), and dosage (0.67 g).The operating temperature ranged from 306.9-349.4K in order to assess the thermodynamics governing the adsorption process.For desorption cycles, two different agents were chosen (nitric acid and hydrochloric acid).The FT-IR spectrum showed peaks around 1,444; 1,650; and 3,300 cm -1 corresponding to the aliphatic, carbonyl, and hydroxyl functional groups.The standard Gibbs free energy ranged around 6.22-6.56kJ mol -1 , while the standard enthalpy and entropy were calculated in 4.2 kJ mol -1 and -0.0067 kJ mol -1 K -1 , respectively.The adsorption capacity of orange peel biomass was reduced by 50% at the end of the third cycle.The highest mechanical resistance (34.07 kgf cm -2 ) after biomass immobilization was reached for 5% biomass-blocks.For this block, the leaching tests reported the concentration of heavy metals in the leachate of 0.2134 ppm.These results confirmed the suitability of the stabilization/solidification technique to immobilize heavy metal ions for bricks with biomass composition of 5% and 7.5%.