Abstract
Current research produced modified adsorbents from pinus bark with high removal capacity of Cd(II), Pb(II) and Cr(III) from water. Pinus barks were obtained directly from pinus logs and its biomass was chemically modified by solutions of H2O2, H2SO4 and NaOH 0.1 mol L−1. The adsorbents were characterized by means of their chemical composition, their point of zero charge (pHPZC), FT-IR, SEM, porosity and superficial area. Experiments evaluated the effect of contact time and equilibrium. Best results showed an increase in adsorption capacity for Cd, Pb and Cr of 413 (Qm of Langmuir), 259 (Qm of Langmuir) and 207% (Kf of Freundlich) for P. NaOH, P. NaOH and P. H2SO4, respectively. The modifying solutions were effective, and chemically modified the pinus bark, increasing the removal quantity of metals from water.
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