4.3 Article

Lower rate of H+(OH-) ions generation at an anion-exchange membrane in electrodialysis

期刊

DESALINATION AND WATER TREATMENT
卷 21, 期 1-3, 页码 109-114

出版社

DESALINATION PUBL
DOI: 10.5004/dwt.2010.1268

关键词

Ion exchange membrane; Modification; Water splitting; H+(OH-) ions generation; Electrodialysis; Hybrid baro-electromembane technologies

资金

  1. Russian Foundation for Basic Research [NN 08-08-01047, 09-08-96523]
  2. Federal Special Purposes Program [N 2010-1.1-234-069-020]

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A way of improvement of electrornembrane technology for water production required in heat-and-power engineering by applying modified anion exchange membranes is proposed. The novel membranes are produced by treatment of commercial Russian heterogeneous MA-40 membranes with a polyelectrolyte bearing quaternary ammonium groups. It is found that this modification results in lowering the rate of H+ and OH- ions generation (water splitting) at overlimiting currents and in a considerable increase in current efficiency due to the decrease in the OH- ions transfer across the anion-exchange membrane. Moreover, we observed an increment in the salt counterion transfer through the membrane. The decrease in water splitting rate at the interface 'anion-exchange membrane/depleted solution' leads to increasing pH in the desalting compartment and decreasing pH in the concentrating one. As a consequence, the risk of the salt precipitation on the membrane surface in the concentrating compartment is reduced, and the removal of weak acids from the desalting water is found enhanced.

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