Effect of pH on separation of Pb (II) and NO super(-) sub(3) from aqueous solutions using electrodialysis

Pb super(2+) and NO super(-) sub(3) are major water pollutants with severe environmental effects. Several methods were used for treating them, but most of the intended solutions failed to treat these ions simultaneously. Electrodialysis (ED) may be able to treat them, particularly after the recent p...

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Bibliographic Details
Published in:Desalination 2012-01, Vol.285, p.46-53
Main Authors: Abou-Shady, Ahmed, Peng, Changsheng, Almeria O, Juan, Xu, Huizhen
Format: Article
Language:English
Subjects:
Electric potential
Electrodialysis
Lead (metal)
Membranes
Separation
Surface chemistry
Voltage
Online Access:Get full text
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Summary:Pb super(2+) and NO super(-) sub(3) are major water pollutants with severe environmental effects. Several methods were used for treating them, but most of the intended solutions failed to treat these ions simultaneously. Electrodialysis (ED) may be able to treat them, particularly after the recent progress in membrane manufacture that has led to significant improvements in the performance. In this paper, we investigated the effect of pH on ED separation of Pb2+ and NO3- in terms of concentration ratio (CR), concentration polarization (ilim), current efficiency ( eta ), and energy consumption (EC). The results showed that, pH between 3 and 5 was the most effective for removal of these ions. Additionally, the distribution of ions among the charged sites on the membrane surfaces was governed by pH. At low electric potentials (
ISSN:0011-9164
DOI:10.1016/j.desal.2011.09.032