Cryogel-based Ag°/Ag2O nanocomposites for iodide removal from water

A. Zh Baimenov, D. A. Berillo, V. J. Inglezakis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study novel silver-modified cryogels were synthesized and applied for the removal of iodide from aqueous solutions. The co-allylamine-methacrylic acid-DMAAm-BisAAm (AAC) and co-allylamine-2-acrylamido-2-methyl-1-propansulfonic acid-DMAAm-BisAAm (SAC) cryogels were decorated with silver by one-step ion-exchange technique and characterized by TEM/EDS, SEM/EDS, FT-IR, XRD and zeta potential measurements. The silver loading was up to 159 and 98 mg/g for AAC and SAC cryogel nanocomposites, respectively. The silver is found in the structure of cryogels in the form of Ag2O and Ag° nanoparticles and the formation of metallic silver is attributed to in situ reduction of silver by the functional groups of the cryogels. The nanocomposites showed rapid kinetics and high adsorption capacity towards iodide. The equilibrium studies showed that in some samples the removal of iodide is higher than the theoretically expected based on the Ag:I molar ratio of 1:1. The analysis of the surface of the cryogels confirmed the theoretical Ag:I molar ratio and a study of the solution phase revealed that small amounts of leached Ag+ from the cryogels resulted in the formation of AgI colloids which, under the conditions of the experiments, exhibit Ag:I molar ratios lower than the theoretical value explaining the discrepancies between the theoretical and actual iodide removal rates.

Original languageEnglish
Article number112134
JournalJournal of Molecular Liquids
Volume299
DOIs
Publication statusPublished - Feb 1 2020

Fingerprint

Cryogels
Iodides
iodides
Silver
Nanocomposites
nanocomposites
silver
Water
water
Allylamine
Energy dispersive spectroscopy
acids
Acids
Zeta potential
Colloids
Functional groups
colloids
Ion exchange
Nanoparticles
aqueous solutions

Keywords

  • Cryogels
  • Iodide removal
  • Nanocomposites
  • Silver nanoparticles
  • Water treatment

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Cryogel-based Ag°/Ag2O nanocomposites for iodide removal from water. / Baimenov, A. Zh; Berillo, D. A.; Inglezakis, V. J.

In: Journal of Molecular Liquids, Vol. 299, 112134, 01.02.2020.

Research output: Contribution to journalArticle

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