Purpose The ability of biochars prepared from pyrolysis of guava pulp and seed industrial wastes to form complexes with the ions 2+ 2+ vanadyl (VO ), a Pearson hard acid, and copper divalent (Cu ), an intermediate acid, was used to characterize the ligand groups of biochars prepared in a laboratory oven and in a pilot plant. These biochars are highly suitable for application as soil conditioners, due to their porous structures and the presence of functional groups on their surfaces. Materials and methods The biochars from guava pulp and seeds industrial wastes were obtained in two ways, using a batch process in a laboratory oven (sample BG1) and a continuous flow process in a pilot plant (sample BG2), in both cases employing a final temperature of 350 °C and off. The characterization techniques used were elemental analysis, Fourier transform infrared (FTIR) spectroscopy,, and electron paramagnetic resonance (EPR) spectroscopy. Results and discussion The FTIR spectroscopy results showed that carboxylic acid groups acted as ligands in the complexes with 2+ Cu ions (samples BG1Cu and BG2Cu), with decreases in the intensities of these bands and increased intensities of carboxylate bands 2+ after complex formation. The EPR parameters indicated that the
Journal of Soils and Sediments – Springer Journals
Published: Jun 3, 2018
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