Preconcentration and selective extraction of chromium species in water samples using amino modified mesoporous silica

Salah Ali Mahgoub Idris, Khalid Mohammed N Alotaibi, Tanya A. Peshkur, Peter Anderson, Lorraine Gibson

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Speciation and separation of chromium (VI) and chromium (III) from aqueous solutions were investigated using amino-propyl functionalised mesoporous silica (AP-MCM-41) as an adsorbent. The as-synthesised adsorbent was produced following a simple synthesis method at room temperature prior to template removal using microwave digestion. The maximum adsorption capacity at 111.1 mg/g was calculated according to the Langmuir isotherm model, suggesting a 1:1 monolayer adsorption mechanism. Moreover, AP is a simple chelate, yet it can extract Cr (VI) exclusively from solutions containing other mixed metal ions simply by tuning the solution pH. Recovery of Cr (VI) from loaded sorbents is equally easy to perform with 100% extraction efficiencies allowing reuse of the sorbent and recovery of Cr (VI) from aqueous solutions containing a complex mixture of ions. The material would find use in environmental remediation applications, as a selective adsorbent of Cr (VI) or even as a solid-phase extraction stationary
phase to remove and pre-concentrate Cr (VI) from aqueous solutions; this study demonstrates enrichment factors of 100 although higher levels are also possible.
Original languageEnglish
Pages (from-to)344-349
Number of pages6
JournalJournal of Colloid and Interface Science
Volume386
Issue number1
DOIs
Publication statusPublished - 15 Nov 2012

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Keywords

  • speciation
  • modified silica
  • water
  • chromium
  • preconcentration

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