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Copper(II) biosorption in the presence of complexing agents (CA) onto orange peel (OP) and chemically modified OP (OPH+, OPNa+, and OP(Na+)(H+)) was studied. The study of the effect of pH showed that OPH+ presented a copper(II) uptake similar to OP in the pH range 1.5–6.0, whereas OPNa+ and OP(Na+)(H+) showed the highest copper(II) uptake in the pH range 4–6. Copper(II) sorption isotherms were obtained...
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