Nickel sorption using Bioclastic Granules as a sorbent material: equilibrium, kinetic and characterization studies

Le résumé fourni par la source

The present study evaluated the potential of bioclastic granules (BG) from Lithothamnium calcareum algae as a sorbent material for the removal of Ni(II) from aqueous solutions, through experimental batch tests. Relevant sorption process variables were evaluated, such as pH (2–7), particle size (<38–300 μm), initial sorbent concentration (0.5–3.0 g L−1), initial metal ion concentration (5–500 mg L−1) and contact time (5–240 min). The data set regarding the uptake of metal ions at equilibrium was well-fitted to the Langmuir isotherm model (R2 0.957), with a qmax of 54.9 mg g−1 and kL 0.014 L mg−1. The kinetic data were better fitted to the pseudo-second order kinetic model (R2 of 0.994), with qeq of 21.74 mg g−1 and k2 of 0.028 g mg−1 min−1. Characterization of BG before and after the sorption tests in the presence of Ni(II) ions was conducted by X-ray fluorescence analysis (XRF), BET surface area, X-ray diffraction (XRD), zeta potential and electron microscopy scanning (SEM-EDS).

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