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

Z. Tauanov, V. J. Inglezakis

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

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

Keywords

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

ASJC Scopus subject areas

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

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