Abstract
We report the removal of paracetamol from aqueous systems using a fixed-bed packed with biochar obtained from pyrolysis of malt bagasse residue (MBR). MBR biochar was characterized by carbonization yield, pH, Fourier-transform infrared spectroscopy (FTIR), and specific surface area (BET method). High surface area biochar (308.6 m² g-1) was fixed in a bed sorption column and sorption capacity was studied by varying the mass of sorbent and sorbate flow rate. Sorption isotherms (breakthrough curves) in the traditional "S" shape were observed in the assays. The nonlinear models of Thomas, Bohart-Adams and Yan-Viraraghavan were applied to the experimental data, with the model of Yan-Viraraghavan best describing the behavior of the isotherms, with a good mean coefficient of determination (R²) of 0.9883. Breakthrough times were greater at lower flow rates and greater sorbent amounts, and the effect of sorbent mass alone upon adsorption capacity (qexp) was not significant for a given flow rate. Thus, beer processing residue can be a source of raw material for the production of value-added MBR biochar, since it showed good sorption results of paracetamol in the biochar fixed-bed column, reaching sorption capacities at equilibrium up to 27.65 mg g-1 depending on the experimental parameters adopted.
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