INIQUI   05448
INSTITUTO DE INVESTIGACIONES PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
Virus removal by iron oxide ceramic membranes
Autor/es:
MARIA FIDALGO DE CORTALEZZI; MARIA VICTORIA GALLARDO; GUILLERMINA GENTILE; RAMON PIZARRO; OSCAR OPEZZO; RAMIRO POMA; VERONICA RAJAL
Revista:
Journal of Environmental Chemical Engineering
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2014 vol. 2 p. 1831 - 1840
ISSN:
2213-3437
Resumen:
Nanoporous iron oxide ceramics were studied for the removal of virus contamination from water.
Supported and unsupported iron oxide nanostructured hematite was fabricated by a green chemistry
route from ferroxane nanoparticles. The material had a surface area of approximately 30 m2
/g and a mean
pore size of 65 nm. Bacteriophage P22 was chosen as a model for human virus. The kinetics and
equilibrium of the attachment process was investigated. P22 adsorption isotherms on iron oxide were
described by the Freundlich equation. Batch experiments resulted in 1.5 LRVs. Removal proceeded rapidly
for the first 7 h; next, a diffusion-limited stage occurred. Dynamic attachment experiments demanded
extensive recirculation to achieve significant reduction levels. Up to 3 LRV were observed. The enhanced
performance can be explained by the higher iron oxide area available and the facilitated access to inner
porosity sites that were previously unavailable due to slow diffusion. The role of electrostatic interactions
in the attachment mechanisms was confirmed by the dependence of the isotherm on the ionic strength of
the suspension medium. P22 bacteriophage is expected to attach to the iron oxide by electrostatic forces
up to a pH of 6.5. DLVO theory predicts moderately well the interaction energies between P22 particles
themselves and between the phage and the ceramic. However, a slight underestimation of the
P22?P22 repulsive forces was evident by comparison to the experimental data