Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 682, Issue -, Pages 259-270Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.05.106
Keywords
Coal fly ash; Synthetic zeolite; Nanocomposites; Silver nanoparticles; Iodide removal
Categories
Funding
- Ministry of Education and Science of Kazakhstan
- Nazarbayev University [SOE2019012, 110119FD4536]
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Synthetic zeolite-based Ag-nanocomposites were synthesized, characterized and used to remove iodide from aqueous solutions. The results showed high removal efficiency (up to 94.85%) and the formation silver iodide which is stable into the material. The maximum achieved adsorption capacity of the nanocomposites was between 19.54 and 20.44 mg/g. The removal mechanism was meticulously studied by taking into account both water chemistry and surface interactions backed by multiple characterization techniques, such as XRD, XRF, SEM/EDX, TEM and BET. The qualitative and quantitative examination of pre- and post-adsorption of nanocomposite samples proved that the anchored silver iodide was formed via oxidation of initial silver nanopartides followed by reaction with iodide to form a stable crystalline precipitate on the surface of the materials. A diffusion-based adsorption model indicated that the controlling mechanism is a slow intraparticle surface diffusion with diffusion coefficients in the range of 0.37-1.72 x 10(-13) cm(2)/s. The investigation of competing and co- existing anions (Cl-, Br-, CO(3)(2-)and CrO42-) on the removal efficiency of iodide demonstrated a negligible effect showing a kinetically favorable precipitation reaction of iodide over other anions. (C) 2019 Elsevier B.V. All rights reserved.
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