Water Nitrate Removal with Ion-Exchanger Grafted Textiles

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Abstract
Two grafted textiles produced by the Institut Textile de France (Lyon), were examined to determine their characteristics for nitrate removal. Both weak and strong basic groups linked to textiles were used as anion-exchangers (AET). Their exchange capacity was measured as ≈ 0.6 meq.g−1, a value lower than the one determined in the case of resins. Rapid exchange kinetics was observed for both textiles. Low nitrate concentrations could be removed easily. After studying of the counter-ion influence, it appeared that nitrate removal was greater when the textiles were in the chloride form. However, the presence of other anions, such as sulphate, hydroxide and chloride could compete in nitrate removal. Selectivity gradients were determined for the weak AET as SO4 2− > NO3 − > Cl−. In the case of strong AET they were: OH− > SO4 2− > NO3 − > Cl−. Regeneration was optimal in the presence of an excess of HCl for both textiles. These anion-exchanger textiles offer an interesting and advantageous alternative for water treatment by ion-exchange technique.

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