Kinetics of Cr(VI) removal by Mg-Al layered double hydroxide doped with Fe2+

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Abstract

The removal of Cr(VI) from aqueous solution by a Mg-Al layered double hydroxide (Mg-Al LDH) doped with Fe2+ increased with time and temperature. Cr(VI) removal could not be described by first-order reaction kinetics, but it was well represented as a pseudo second-order reaction. The apparent rate constants at 10, 30, and 60°C were 0.9×10-3, 1.2×10-3, and 2.2×10-3gmmol-1min-1, respectively, and the apparent activation energy was 14.5kJmol-1. This value confirms that the rate-determining step for Cr(VI) removal is chemical adsorption involving the anion exchange of Cr2O72- with intercalated Cl- and the adsorption of Cr2O72- on the surface of the produced FeO(OH).

Original languageEnglish
Pages (from-to)134-136
Number of pages3
JournalJournal of Water Process Engineering
Volume4
Issue numberC
DOIs
Publication statusPublished - 2014 Jan 1

Keywords

  • Cr(VI)
  • Doping
  • Fe
  • Kinetics
  • Layered double hydroxide
  • Removal

ASJC Scopus subject areas

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

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