INVESTIGADORES
OCHOA Nelio Ariel
artículos
Título:
Preparation and characterization of polymeric microspheres for Cr(VI) extraction
Autor/es:
N. A. OCHOA; C. O. ILLANES; J. MARCHESE; C. BASUALTO; F. VALENZUELA
Revista:
SEPARATION AND PURIFICATION TECHNOLOGY
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2006 vol. 52 p. 39 - 45
ISSN:
1383-5866
Resumen:
Microspheres (MS) from different polymers were prepared using two routes. Route A: process of phase inversion with solutions of polysulfone
(PSf) in dichloromethane (DCM) and polyvinylpyrrolidone (PVP) as additive. Different weight ratios of PSfPVP were used in the MS preparation.
Route B: MS were obtained by cross-linking in emulsion using a commercial silicone as raw material. The obtained MS were analysed according
to their morphologicalstructural characteristics and in relation to their Cr(VI) extraction capacity using impregnated MS with Aliquat 336. The
results obtained showed that MS prepared with PSfPVP have both less specific surfaces and relative porosities when the proportion of PVP in the
mixture is increased. Extraction tests of ion Cr(VI) indicated that synthesized MS have adequate structural characteristics and interesting adsorptive
properties which give rise to impregnating selective extractants. Impregnated microspheres with Aliquat 336 prepared from 2:1 PSfPVP ratio
achieved the highest Cr(VI) extractive performance (92% of Cr extraction for contact time of 60 min) and the best breakthrough point in column
tests (up to 10 h in the first cycle).