Magnetic amendment material based on bio-char from edible oil industry waste. Its performance on aromatic pollutant removal from water

CASONI, ANDRÉS I.; MENDIOROZ, PAMELA; VOLPE, MARÍA A.; GUTIERREZ, VICTORIA S.

Journal of Environmental Chemical Engineering

Elsevier BV

Año: 2019

2213-3437

2 Highlights  An edible oil industry lignocellulosic waste is valorized  Magnetic bio-chars are obtained from sunflower seed hulls  Bio-char are tested for adsorption of guaiacol in aqueous media Bio-chars produced from the pyrolysis of sunflower seed hulls are investigated in the context of adding value to edible oil industry waste. Magnetic bio-chars are obtained to employ them for the aqueous adsorption of guaiacol, which is a model molecule of pollutants in water. Two magnetization methods are followed to get a series of magnetic bio-chars, one based on the pyrolysis of sunflower seed hulls previously washed with FeCl 3 .6H 2 O solutions (MBFs) and the other one consisting of magnetization of the bio-char obtained from the pyrolysis of the hulls pretreated with ZnCl 2 (MBZ). A full characterization of the samples is carried out by Scanning Electronic Microscopy (SEM), X-Ray Diffraction (XRD), Atomic Absorption (AA), Fourier Transformed Infrared spectroscopy (FTIR), and N 2 sorptometry. Selected magnetic bio-chars are tested for the adsorption of guaiacol in water with four models: Langmuir, Freundlich, Sips and Temkin. The best performance is assigned to the sample MBF5 containing 15.2 Fe %wt. with a maximum adsorption capacity Journal Pre-proofof 48.49 mg/g and a heterogeneous surface according to Sips model. Temkin model predicts physisorption as guaiacol surface interaction presenting a b parameter of 15.87 J/mol.