Magnetic Hydrochar nanocomposite obtained from sunflower husk: A potential material for environmental remediation

PATIÑO, AURA ALEJANDRA BURBANO; LASSALLE, VERÓNICA LETICIA; HORST, MARÍA FERNANDA

JOURNAL OF MOLECULAR STRUCTURE

ELSEVIER SCIENCE BV

Año: 2021

0022-2860

A novel magnetic hydrochar composed of nanosized magnetite (Fe3O4) particles supported ona hydrochar matrix was synthesized via hydrothermal carbonization of sunflower husk,employing phosphoric acid as the activating agent. An exhaustive characterization of thehydrochars and the magnetic hydrochar was undertaken to identify, mainly, the mechanism bywhich the iron oxide nanoparticles interact with the hydrochar matrix. The magnetic hydrocharexhibited superparamagnetic properties with a saturation magnetization of 55,21 emu/g. BETsurface area and pore diameter of the magnetic hydrochar were found to be 55.25 m2/g and10,49 nm respectively which are in accordance with mesoporous materials. Fourier transforminfrared spectroscopy and z potential characterization suggest that the main mechanisms ofinteraction between the magnetite nanoparticles and the hydrochar matrix were coulombic ones,where carboxyl and hydroxyl oxygen-containing functional groups of the hydrochar were morelikely to interact with the iron oxide nanoparticles.