SYNTHESIS OF CARBON-SUPPORTED IRON NANOPARTICLES USING ULTRASONIC SPRAY PYROLYSIS

摘要

Iron and/or iron oxide nanoparticles are employed in numerous environmental and industrial applications including adsorption (e.g., CO and arsenic), catalysis (e.g., Fischer-Tropsch process), environmental remediation (e.g., PCDD/F destruction), electronic sensing, and those requiring magnetic materials (e.g., removable magnetic storage media, MRI). Carbon provides several advantages as a metal nanoparticle support including inertness in acidic and basic conditions, thermal and mechanical stability of the porous structure, and high surface area and defined/modifiable porous structure. Metal impregnated carbon materials are traditionally prepared in a multi-step process that includes: (1) selection, preparation, and modification of the carbon support, (2) loading of the metal precursor onto carbon using incipient wetness, excess solution, ion exchange impregnation techniques, or chemical vapor deposition (CVD), and (3) conversion of the metal precursor to the desired metal oxide or zero-valent form by physical (e.g., heating) or chemical (e.g., reduction) treatments.