Modelling and fixed bed column adsorption of Cr(VI) onto orthophosphoric acid-activated lignin

Ahmad B. Albadarin, Chirangano Mangwandi, Ala'A H. Al-Muhtaseb, Gavin M. Walker, Stephen J. Allen, Mohammad N M Ahmad

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The advantage of using an available and abundant residual biomass, such as lignin, as a raw material for activated carbons is that it provides additional economical interest to the technical studies. In the current investigation, a more complete understanding of adsorption of Cr(VI) from aqueous systems onto H 3PO 4-acid activated lignin has been achieved via microcolumns, which were operated under various process conditions. The practice of using microcolumn is appropriate for defining the adsorption parameters and for screening a large number of potential adsorbents. The effects of solution pH (2-8), initial metal ion concentration (0.483-1.981 mmol·L -1), flow rate (1.0-3.1 cm 3·min -1), ionic strength (0.01-0.30 mmol·L -1) and adsorbent mass (0.11-0.465 g) on Cr(VI) adsorption were studied by assessing the microcolumn breakthrough curve. The microcolumn data were fitted by the Thomas model, the modified Dose model and the BDST model. As expected, the adsorption capacity increased with initial Cr(VI) concentration. High linear flow rates, pH values and ionic strength led to early breakthrough of Cr(VI). The model constants obtained in this study can be used for the design of pilot scale adsorption process.

Original languageEnglish
Pages (from-to)469-477
Number of pages9
JournalChinese Journal of Chemical Engineering
Volume20
Issue number3
DOIs
Publication statusPublished - Jun 2012

Keywords

  • activated carbon
  • adsorption
  • fixed bed column
  • hexavalent chromium
  • lignin

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Biochemistry
  • Environmental Engineering
  • Chemistry(all)

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