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Removal of Iodide From Water Using Silver Nanoparticles-Impregnated Synthetic Zeolites

Removal of Iodide From Water Using Silver Nanoparticles-Impregnated Synthetic Zeolites

Z Tauanov, V J Inglezakis

Sci Total Environ. 2019 Sep 10;682:259-270.

PMID: 31125740

Abstract:

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 20.44mg/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 nanoparticles 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 0.37-1.72×10-13cm2/s. The investigation of competing and co-existing anions (Cl-, Br-, CO32-, and CrO42-) on the removal efficiency of iodide demonstrated a negligible effect showing a kinetically favorable precipitation reaction of iodide over other anions.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7783962	Silver iodide		7783-96-2	Price

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