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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

TAPIERO, YESID; RIVAS, BERNABÉ L  and  SANCHEZ, JULIO. FUNCTIONAL ION MEMBRANES SUPPORTED INSIDE MICROPOROUS POLYPROPYLENE MEMBRANES TO TRANSPORT CHROMIUM IONS: DETERMINATION OF MASS TRANSPORT COEFFICIENT. J. Chil. Chem. Soc. [online]. 2014, vol.59, n.4, pp.2737-2746. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072014000400022.

Polypropylene (PP) membranes incorporating interpenetrating polymer networks of poly[(ar-vinylbenzyl) trimethylammonium chloride](P(ClVBTA)) and poly[sodium (styrenesulfonate)] P(SSNa) were modified via an "in-situ" radical polymerization synthesis inside the pores. The modified polypropylene membranes were characterized using SEM, ATR/FTIR, DRX, TGA, and Donnan dialysis for the transport of chromium ions. The modified membranes exhibited a percent modification between 2.5% and 4.0% in weight gain and a hydrophilic character with a water uptake capacity between 15% and 20%. The mass transport coefficient was determined using the non-linear fit of the experimental data to the exponential equation. Hexavalent chromium ions were efficiently transported by the modified membranes containing P(ClVBTA). At pH 3.0, the M4Cl.PEI (11.0x10-6 m s-1), and at pH 9.0, the M3Cl (14.4x10-6 m s-1) could transport hexavalent chromium ions efficiently using a 1 mol L-1 NaCl extraction agent. In the same way, the transport of trivalent chromium could be performed using membranes modified with P(SSNa). At pH 3.0 and 4.0x10-2 mol L-1 trivalent chromium in the food chamber, the M9Na.PVA (16.3x10-6 m s-1) performed efficient transport using 1x10-3mol L-1 HNO3 as the extraction agent.

Keywords : interpenetrating polymer network; membranes; Donnan dialysis; chromium; ion exchange; and polypropylene.

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