In this work, a novel silver-doped synthetic sodalitic composite was synthesized and characterized using advanced characterization methods, namely TEM-EDS, XRD, SEM, XRF, BET, zeta potential and particle size analysis. The synthesized nanocomposite was used for the removal of Hg 2+ from 10 ppm aqueous solutions of initial pH equal to 2. The results showed that the sodalitic nanocomposites removed up to 98.65% of Hg 2+ , which is approximately 16% and 70% higher than the removal achieved by sodalite and parent coal fly ash, respectively. The findings revealed that the Hg 2+ retention in nanocomposite microstructure is a multifaceted mechanism that predominantly involves adsorption, precipitation and Hg-Ag amalgamation. The study of the anions effect (Cl-, NO3-, C2H3O2and SO4 2-) indicated that the Hg 2+ uptake is comparatively higher when Clanions co-exist with Hg 2+ in the solution.