Abstract
Arsenic is a very toxic element that must be removed efficiently from aqueous streams. Among the most promising techniques used for the removal of arsenic are separation methods using membranes. In this study, a regenerated cellulose ultrafiltration (UF) membrane and a poly(diallyl dimethyl ammonium chloride) P(DADMAC) were coupled and used in combination to remove As(V) from an aqueous solution. The influences of pH, the polymer:As(V) molar ratio, and the presence of interfering ions such as chloride and sulfate were investigated in arsenic removal via the washing method. The efficient retention of arsenic was observed at pH 7 with a 5:1 polymer:As molar ratio and with an efficiency of approximately 85 % at Z = 10 for P(DADMAC). The maximum retention capacity of As(V) was determined by the enrichment method, and the results indicated that 194 mg of As(V) was removed per gram of polymer. Finally, using enrichment and washing methods sequentially, the sorption–desorption process and regeneration of P(DADMAC) were performed successfully.
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Acknowledgments
The authors thank the FONDECYT (Project No. 1110079), PIA (Anillo ACT-130), REDOC (MINEDUC Project UCO1202 at U. de Concepción). 7FP-MC Actions Grant, CHILTURPOL2 (PIRSES-GA-2009 Project, Grant No. 269153) and Marie Curie Program. Julio Sánchez thanks FONDECYT (Grant No. 11140324) and CIPA, Chile.
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Sánchez, J., Rivas, B.L., Özgöz, S. et al. Ultrafiltration assisted by water-soluble poly(diallyl dimethyl ammonium chloride) for As(V) removal. Polym. Bull. 73, 241–254 (2016). https://doi.org/10.1007/s00289-015-1483-4
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DOI: https://doi.org/10.1007/s00289-015-1483-4