This study aims to evaluate the mineralogical influence on competitive adsorption of transition metal ions on sediments from Solimões formation (HIRA, H6B, H9F E H23A). The characterization of sediment samples was performed by chemical and mineralogical analyzes. The adsorption experiments were conducted under natural pH conditions and the experimental isotherm data were analyzed using Langmuir and Freundlich isotherm equations. Parameters of thermodynamic equilibrium were determined and the adsorption affinity of metal ions was investigated. The results indicated that the sediments contain especially the following minerals: illite, kaolinite and quartz in all samples; montmorillonite Ca-Mg in samples HIRA, H23A and H9F; interstratified mica-smectite in the samples H6B and H9F; albite (Na[Si 3 Al]O 8) in the H9F; gypsum (CaSO 4 2.H 2 O) in the HIRA. The pH values for adsorption of metal ions and qmax (mg g-1) decreases in the order: pH) 3.8 to 5.4 (HIRA), 3.0 to 4.4 (H9F), 2.6 to 3 2 (H23A); mg g-1 of Cu (II) = 211 (H9F), 205 (H23A), 159 (HIRA) and 146 (H6B); mg g-1 of Zn (II) = 153 (H23A = HIRA), 116 (H9F) and 99 (H6B); mg g-1 of Ni (II)= 131 (H23A = HIRA), 125 (H6B) and 120 (H9F). The data obtained for the Gibbs free energy (G o =-37.91 to-32.2 kJ mol-1), Freundlich constant (n F = 1.56 to 3.75) and separation factor (K RL = 0.025 to 0.80), are compatible with heterogeneous systems, in physical-chemical, favorable and spontaneous processes. The affinities of metal ions on sediment samples follow the order: Cu>Zn>Ni (HIRA and H23A), Cu>Zn=Ni (H9F) and Cu>Ni>Zn (H6B).
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