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Synthetic sodalite doped with silver nanoparticles: Characterization and mercury (II) removal from aqueous solutions
Z Tauanov1,2, P E Tsakiridis2,3, D Shah1
1a Chemical & Materials Engineering Department, School of Engineering, Environmental Science and Technology Group (ESTg) , Nazarbayev University , Astana , Kazakhstan.
Abstract:
In this work, a novel silver nanoparticles-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 Hg2+ from 10 ppm aqueous solutions of initial pH equal to 2. The results showed that the sodalitic nanocomposites removed up to 98.65% of Hg2+, which is ∼16% and 70% higher than the removal achieved by sodalite and parent coal fly ash, respectively. The findings revealed that the Hg2+ removal mechanism is a multifaceted mechanism that predominantly involves adsorption, precipitation and Hg-Ag amalgamation. The study of the anions effect (Cl-, NO3-, C2H3O2-, and SO42-) indicated that the Hg2+ uptake is comparatively higher when Cl- anions co-exist with Hg2+ in the solution.
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