Removal of copper from aqueous solutions by biosorption onto pine sawdust

Untreated Pinus radiata sawdust was investigated for the removal of Cu+2 ions from aqueous solutions. The biomass characterized by Inductively Coupled Plasma-Mass (ICP-MS) spectrometry and Scanning Electron Microscopy with an Energy Dispersive X-ray spectroscopy (SEM-EDX), X-Ray crystalline powder Diffraction (XRD) Fourier Transform Infrared (FTIR) spectroscopy, before after adsorption. influence contact time (up to equilibrium), adsorbent dose (1–50 g/L), initial metal ion concentration (5–300 mg/L) pH (2–8) on copper sorption efficiency studied through batch experiments. results demonstrated that adsorption equilibrium is reached in less than 2 h best conditions (Cu+2 percentage, 93.4% capacity, 0.82 mg/g) were achieved increasing up 5 g/L solution 7, decreasing mg/L. optimized means a Doehlert experimental design analyzing (5–15 g/L) (5–45 efficiency. Kinetic data satisfactorily fitted second-order kinetic model. Intraparticle diffusion model different stages are involved process. Langmuir isotherms bioadsorption data. Desorption studies high efficiencies 94.5% possibility regeneration four adsorption-desorption cycles. Thus, this study evidenced promising efficient, renewable economic its use purpose constitutes alternative management valorization.