Electron paramagnetic resonance (EPR) spectroscopy as a tool for the characterization of biochar from guava waste

Electron paramagnetic resonance (EPR) spectroscopy as a tool for the characterization of biochar... 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Soils and Sediments Springer Journals

Electron paramagnetic resonance (EPR) spectroscopy as a tool for the characterization of biochar from guava waste

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Environment; Soil Science & Conservation; Environment, general; Environmental Physics
ISSN
1439-0108
eISSN
1614-7480
D.O.I.
10.1007/s11368-018-2048-6
Publisher site
See Article on Publisher Site

Abstract

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

Journal of Soils and SedimentsSpringer Journals

Published: Jun 3, 2018

References

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