Novel comparison of kinetic models for the adsorption-coupled reduction of Cr(VI) using untreated date pit biomaterial

Ahmad Albadarin, Yoann Glocheux, Mohamad Ahmad, Gavin Walker, Chirangano Mangwandi

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Biosorption of Cr(VI) onto date pit biomass has been investigated via kinetic studies as functions of initial Cr(VI) concentration, solution temperature and date pit particle size. Kinetic experiments indicated that chromate ions accumulate onto the date pits and then reduce to less toxic Cr(III) compounds. The López-García, Escudero and Park Cr(VI) biosorption kinetic models, which take into consideration the direct reduction, the passivation process and the follow-on decrease of the active surface area of reaction, were applied to the kinetic data. The models represented the experimental data accurately at low Cr(VI) concentration (0.480 mM) and small particle size (0.11–0.22 mm) at which the Cr(VI) was completely removed from the aqueous solution and completely reduced to Cr(III) after 420 min. Date pit biomass thus offers a green chemical process for the remediation of chromium from wastewater. This investigation will help researchers employ the adsorption-coupled reduction of Cr(VI) models and simplify their application to kinetic experimental data.
Original languageEnglish
Pages (from-to)200-205
Number of pages6
JournalEcological Engineering
Volume70
Early online date18 Jun 2014
DOIs
Publication statusPublished - Sep 2014

Keywords

  • Hexavalent chromium
  • Kinetic experiments
  • Adsorption-coupled reduction
  • Bioreduction

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