Removal of iodide from water using silver nanoparticles-impregnated synthetic zeolites

Z. Tauanov, V. J. Inglezakis

Research output: Contribution to journalArticle

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 20.44 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 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 −13 cm 2 /s. The investigation of competing and co-existing anions (Cl , Br , CO 3 2− , and CrO 4 2− )on the removal efficiency of iodide demonstrated a negligible effect showing a kinetically favorable precipitation reaction of iodide over other anions.

Original languageEnglish
Pages (from-to)259-270
Number of pages12
JournalScience of the Total Environment
Volume682
DOIs
Publication statusPublished - Sep 10 2019

Fingerprint

Zeolites
iodide
Iodides
Silver
silver
Nanoparticles
Adsorption
Nanocomposites
Water
Anions
adsorption
Negative ions
water
Surface diffusion
anion
Carbon Monoxide
Precipitates
Energy dispersive spectroscopy
Crystalline materials
Transmission electron microscopy

Keywords

  • Coal fly ash
  • Iodide removal
  • Nanocomposites
  • Silver nanoparticles
  • Synthetic zeolite

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Cite this

Removal of iodide from water using silver nanoparticles-impregnated synthetic zeolites. / Tauanov, Z.; Inglezakis, V. J.

In: Science of the Total Environment, Vol. 682, 10.09.2019, p. 259-270.

Research output: Contribution to journalArticle

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