(586c) Synthesis and Characterization of Magnetic Nanoparticles for Enhanced Gas-Liquid Mass Transfer

Abstract

Magnetite particles were
synthesized by the coprecipitation of iron (II) and iron (III) chlorides in the
presence of a surfactant and ammine base. These particles had relatively low
internal surface areas, but high external surface due to the small particle
diameter. Silica coated magnetite particles were synthesized by the hydrolysis
of tetraorthosilicate (TEOS) and the coprecipitation of iron chlorides in the
presence of different surfactants and an ammine base. Commercial magnetite
nanoparticles were also coated with silica using TEOS and a base in the
presence or absence of a dispersant. All samples were characterized using XRD,
SEM, TEM, and nitrogen adsorption to obtain diffraction patterns, particle
morphology data, and BET surface areas. Adsorption isotherm studies were
conducted for the adsorption of trichloroethylene from aqueous samples on to
low surface area magnetite nanoparticles and high surface area silica coated
magnetite nanoparticles. Studies were also conducted on the effect of nanoparticles
on the effect of high and low surface area nanoparticles on gas-liquid mass
transfer in aqueous systems. This paper will present data on the synthesis and
characterization of these nanoparticles and their potential to enhance mass
transfer in gas-liquid systems.