Uranium removal from aqueous solution using macauba endocarp-derived biochar: Effect of physical activation

The main aim of this study was to evaluate options for addressing two pressing challenges related environmental quality and circular economy stemming from wastage or underutilization abundant biomass residue resources contamination water by industrial effluents. In we focused on residues (endocarp) Macaúba palm (Acrocomia aculeata) used oil production, its conversion activated biochar, potential use in uranium (U) removal aqueous solutions. Batch adsorption experiments showed a much higher uranyl ions (U(VI)) efficiency biochar compared untreated biochar. As result activation, an increase 80.5% (untreated biochar) 99.2% (after activation) observed 5 mg L?1 initial U(VI) concentration solution adjusted pH 3 using 10 g adsorbent dosage. BET surface area increased 0.83 643 m2 g?1 with activation. Surface topography the very characteristic morphology high porosity. Activation significantly affected chemical FTIR analysis indicated that removed physisorption solution. adsorbed detected micro X-ray fluorescence technique. Adsorption isotherms were employed represent results U onto An estimation best fit performed calculating different deviation equations, also called error functions. Redlich-Peterson isotherm model most appropriate fitting experimental data, suggesting heterogeneity sites affinities setting up as hybrid adsorption. These demonstrated physical activation increases capacity macauba endocarp-derived solutions, therefore open new application type waste-derived