ABSTRACT In this study, the remediation of Ni(II) ions in solution using sugarcane bagasse (SCB), extracted cellulose (EC), and carboxymethyl cellulose (CMC) obtained by chemical modification of sugarcane bagasse as effective biosorbents was carried out. The biosorbents were characterized by X-Ray Powder Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR-ATR) and Scanning Electron Microscopy (SEM) to confirm the physical and chemical properties and surface morphology of the biosorbents. The adsorption capacities showed that CMC (125.7 mg/g) was more effective than EC (25.4 mg/g) and crude SCB (41.9 mg/g). Kinetic studies of the adsorption process analyzed using the non-linear pseudo-first order (PFO) and pseudo-second order (PSO) models show that the order of the adsorption follows PSO on SCB and EC but PFO on CMC. The equilibrium process studied on the non-linear Langmuir, Freundlich, Hill, and Redlich-Peterson models showed that all models were applicable, but the Hill isotherm was the most suitable. The favorability of adsorption was confirmed for all biosorbents by the values of the separation factor R L , which was in the order of 0 R L <1. Reusability of the CMC as a better performing adsorbent proved that the adsorbent could be recycled and that the effect of interfering ions was minimal.
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