Characterization and quantification of chromate adsorption by layered porous iron oxyhydroxide: An experimental and theoretical study

Zongsu Wei*, Shuang Luo, Ruiyang Xiao, Rafail Khalfin, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The inner structure of iron oxyhydroxide agglomerates (IOAs) prepared from hydrolysis of ferric chloride was characterized and correlated to surface complexation of hexavalent chromium, Cr(VI), in a broad range of pH (3–12) and ionic strengths (0.0–5.0 M). Evolution of particle size, morphology, and surface activity, combined with density functional theory (DFT) calculations, support the condensation reaction initiated formation of IOAs in three levels: iron nanoparticles to nanolayers to agglomerates. This agglomeration process led to a layered porous structure for aqueous-phase IOAs resulting in a rapid and high removal of Cr(VI) in batch tests. By integrating adsorption results, thermodynamic modeling, and quantum chemical calculations for the adsorption reactions, a quantitative distribution profile for each surface coordination of Cr(VI) ions (i.e., monodentate, bidentate, and hydrogen-bonding) was established. Results of this study are important to understand the fundamental mechanism of IOAs formation in aqueous phase and the intrinsic nature of surface complexations at the mineral-water interface for optimal Cr(VI) removal in hypersaline waste streams.

Original languageEnglish
Pages (from-to)472-481
Number of pages10
JournalJournal of Hazardous Materials
Volume338
DOIs
StatePublished - 2017
Externally publishedYes

Keywords

  • Agglomeration
  • Condensation
  • DFT
  • Iron oxyhydroxide
  • Surface coordination

Fingerprint Dive into the research topics of 'Characterization and quantification of chromate adsorption by layered porous iron oxyhydroxide: An experimental and theoretical study'. Together they form a unique fingerprint.

Cite this