Manuscrito
Removal of molybdate and vanadate ions by a copolymer adsorbent in aultrafiltration system
Fecha
2015Institución
Resumen
In this investigation, the removal of Mo and V oxyanions was carried out using the polymerassisted
ultrafiltration technique (PAUF) with a poly(acrylamide-co-diallyldimethylammonium
chloride) (P(AAm-DDACl)).
As a result, 100% of Mo and 80% of V were removed at pH values of 9, with a polymer:metal
molar ratio of 10:1 and an optimum metal concentration of 60 mg/L. The presence of competitive
ions such as phosphate, sulfate, and chloride affected the retention of Mo, decreasing its retention
to 60% in all cases. For V, all competitive ions behaved in a similar way, producing
approximately 50% of metal removal. The permeate flux was kept almost constant for all
solutions (40 to 80 L/hm2), which indicates that the optimal retention conditions are stable over
time. In addition, the characterization of P(AAm-DDACl) was carried out by infrared
spectroscopy analysis (FT-IR), and the morphology of the membrane before and after use was
analyzed by scanning electron microscopy (SEM) showing significant changes in its morphology.
The energy dispersive X-ray spectroscopy (EDS) analysis indicates the presence of Mo and
P(AAm-DDACl) in the membrane after use.
Rivas BL (main)
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Keywords: Polymer; Membrane, Ultrafiltration; Vanadium; Molybdenum.