Selective Dinitramide Removal from Aqueous Solution by Crosslinked PolyDADMAC Gels

Abstract

AbstractCrosslinked poly(diallyldimethylammonium chloride) (DADMAC) was demonstrated as selective conjugate for near quantitative adsorption of dinitramide anions from water in a wide pH range (1‐10) and efficient replacement takes place even at 1 : 1 DADMAC/dinitramide molar ratio with short contact time and low concentration. Adsorption was determined to be highly selective over nitrate and sulfate ions. Colorimetric determination of potassium dinitramide based on UV absorption at 284 nm revealed nearly 90 % exchange of chloride counter ions with dinitramide ions under optimum conditions. The effect of gel amount, pH and dinitramide concentration was analyzed. The structural and thermal characteristics of the gel were investigated by FTIR, SEM, DSC, and TGA. In addition, the regeneration and reuse properties of crosslinked polyDADMAC were also assessed.