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I. Korus

Removal of Pb(II) ions by means of polyelectrolyte enhanced ultrafiltration (in English)
Polimery 2010, No 2, 135


DOI: dx.doi.org/10.14314/polimery.2010.135

Summary

This work proposes polyelectrolyte enhanced ultrafiltration to remove Pb(II) from aqueous solutions. Model solutions containing 1-100mg Pb/dm3 were used in the research. Poly(sodium 4-styrenesulfonate) (PSSS), which is a water-soluble polymer containing strong cation-exchange groups, was used as a metal binding agent. The process was conducted on a polysulfone membrane with molecular weight cut-off 60 000. The main parameters determining the effectiveness of lead retention (the polyelectrolyte quantity and solution pH) were examined. High retention coefficients (>0.98) were achieved for pH > 4 and 2.5-5-fold excess of polyelectrolyte to metal. Ultrafiltration concentration of Pb(II) solution (50mg/dm3) was carried out according to the previously determined polymer/metal concentration ratio, and at optimum pH. The lead retention coefficient (R), observed during the process, was within the range of 0.98-0.99. The retentate obtained was used in the next decomplexation-ultrafiltration step (ultrafiltration at pH=1), which made possible the separation of polyelectrolyte (retentate) and the recovery of 85% of concentrated Pb ions (permeate). The residual lead, still remaining in the polymer solution, was diafiltred by a 5-fold amount of water acidified to pH=1.


Key words: lead(II), polyelectrolyte, ultrafiltration, polysulfone membrane


e-mail: irena.korus@polsl.pl

I. Korus


Removal of Pb(II) ions by means of polyelectrolyte enhanced ultrafiltration (in English)