Abstract

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(-3)mol L-1 HNO3 as the extraction agent.