Arsenate removal by iron (hydr)oxide modified granulated activated carbon: Modeling arsenate breakthrough with the pore surface diffusion model

Kiril Hristovski, Paul Westerhoff, John C. Crittenden, Larry Olson

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

This study focuses on evaluating the feasibility of using pore surface diffusion model (PSDM) to successfully predict arsenate breakthrough curves of continuous flow packed columns containing granulated activated carbon modified with iron (hydr)oxide. Two different treatment methods were used to synthesize modified granulated activated carbon media (M-GAC): (i) Fe(III)/alcohol treatment method (M-3-15), and (ii) KMnO4/Fe(II) treatment method (Mn-0.5-15). Adsorption capacities were obtained and fitted by Freundlich isotherm model (q = K × CE1/n) for initial arsenate concentration of 120 μg As(V)/L at either pH = 7.3 ± 0.1 for M-3-15 or pH = 8.3 ± 0.1 for Mn-0.5-15 in 10 mM NaHCO3 buffered ultrapure water. Short bed adsorber (SBA) columns tests were conducted at the same water quality condition as the batch experiments and used to validate the PSDM.

Original languageEnglish (US)
Pages (from-to)3154-3167
Number of pages14
JournalSeparation Science and Technology
Volume43
Issue number11-12
DOIs
StatePublished - Aug 1 2008

Keywords

  • Adsorption
  • Arsenate
  • Granulated activated carbon
  • Iron (hydr)oxide
  • Pore surface diffusion model

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Process Chemistry and Technology
  • Filtration and Separation

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