Evidence of ammonium ion-exchange properties of natural bentonite and application to ammonium detection.

Abstract : Ammonium exchange with hybrid PVC-bentonite (mineral montmorillonite clay) thin film was revealed using FTIR spectroscopy, EDX, cyclic voltammetry and electrochemical impedance spectroscopy. The effect of ammonium exchange on the charge transfer resistance of PVC-bentonite hybrid thin film was attributed to a modification of the intersheet distance and hydration of bentonite crystals. The obtained impedimetric ammonium sensor shows a linear range of detection from 10(-4)M to 1M and a detection limit around 10(-6)M.
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Submitted on : Monday, January 6, 2014 - 2:39:49 PM
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A. Zazoua, I. Kazane, N. Khedimallah, C. Dernane, Abdelhamid Errachid, et al.. Evidence of ammonium ion-exchange properties of natural bentonite and application to ammonium detection.. Materials Science and Engineering: C, Elsevier, 2013, 33 (8), pp.5084-5089. 〈10.1016/j.msec.2013.09.005〉. 〈hal-00924174〉

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