Influence of sulfate and nitrate uptake from aqueous solutions on surface exchange in Purolite A-520E resin |
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| Affiliation: | 1. University Politehnica from Bucharest, Faculty of Applied Chemistry and Materials Science, No. 1-7, Gh. Polizu St., 011061 Bucharest, Romania;2. PATLAB and Laboratory of Electrochemistry, National Institute of Research and Development for Electrochemistry and Condensed Matter, 202 Splaiul Independentei St., 060021 Bucharest, Romania;3. METAV - CD, No 31, C.A. Rosetti St., 020011 Bucharest, Romania |
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| Abstract: | Removal of nitrate anions from aqueous solutions is the principal goal of many studies concerning water treatment. The ion exchanger capacity to remove nitrate from water was investigated using commercial type A-520E anion exchange resins. The nitrate and sulfate ion exchanger capacity, in static conditions, depends on the concentration of ions and on the pH value of the aqueous solution. The local structural environment exchanged on A-520E has been investigated by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX) and 2D and 3D atomic force microscopy (AFM). All images of the ion exchanger were obtained before and after contact with solutions that contain NO3− and SO42− separately as well as mixtures of both. |
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| Keywords: | Wastewater treatment Ion exchange Purolite A-520E Nitrate Sulfate SEM AFM |
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