The pore surface diffusion model as a tool for rapid screening of novel nanomaterial-enhanced hybrid ion-exchange media

Grigoria Athanasaki, Laurie Sherrill, Kiril Hristovski

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The primary goal of this study was to examine the feasibility of using Pore Surface Diffusion Model (PSDM) as a rapid screening tool to predict breakthrough curves of short bed columns packed with nanomaterial enhanced hybrid-ion exchange media. A novel hybrid-ion exchange media was fabricated by synthesizing titanium dioxide nanostructured endoskeleton inside nitrate selective strong base ion-exchange resin. The properties of the hybrid media were characterized and batch reactor tests were conducted with arsenate (As) and nitrogen-nitrate (NO3 -N) as model contaminants in 5 mM NaHCO3 buffer ultrapure water at final pH = 7.2 ± 0.3 to assess the contaminant removal capacity and develop sorption isotherms. Freudlich sorption isotherm (q = KCe 1/n) model was used to provide inputs for the PSDM predictions of the contaminants' breakthrough curves. To validate the PSDM breakthrough curve predictions for both model contaminants, continuous short bed packed column tests were conducted under the modeled conditions. Hybrid media regeneration was also conducted with solution mix of 2% KOH and 1% KCl followed by rinse with 0.1% HCl, and the column was operated under same conditions to assess the regeneration efficiency of the media. The results demonstrated that 100% regeneration efficiency could be achieved for nitrate, while only 75% efficiency could be achieved for arsenate under these regeneration conditions. The PSDM was able to successfully predict the breakthrough curves for arsenic and nitrate with relatively high precision, characterized by R2 ≈ 0.977 and R2 ≈ 0.930 for arsenate and nitrate, respectively.

Original languageEnglish (US)
Pages (from-to)448-456
Number of pages9
JournalEnvironmental Science: Water Research and Technology
Volume1
Issue number4
DOIs
StatePublished - 2015

ASJC Scopus subject areas

  • Water Science and Technology
  • Environmental Engineering

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