Reduction of hexavalent chromium using Sorbaria sorbifolia aqueous leaf extract

Shashi Prabha Dubey, Mika Sillanpaa, Rajender S. Varma

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


Aqueous plant leaves extract (PLE) of an abundant shrub, Sorbaria sorbifolia, was explored for the reduction of hexavalent chromium, Cr(VI), to trivalent chromium, Cr(III). The effect of contact time, pH, PLE quantity, ionic strength, hardness, temperature and effective initial Cr(VI) ion concentration were tested; Cr(VI) reduction followed the pseudo-first order rate kinetics and maximum reduction was observed at pH 2. Significantly, Cr(VI) reduction efficacies varied from 97 to 66% over the pH range of 2 to 10, which bodes well for PLE to be used for the reduction of Cr(VI) also at a higher pH. PLE-mediated Cr(VI) reduction displays considerable efficiency at various ionic strengths; however, hardness strongly affects the reduction ability. Higher temperature significantly enhances the Cr(VI) reduction. This study reveals the potential use of PLE as a green reducing agent in aqueous extract for the efficient reduction of Cr(VI) to Cr(III).

Original languageEnglish
Article number715
JournalApplied Sciences (Switzerland)
Issue number7
Publication statusPublished - 11 Jul 2017
Externally publishedYes


  • Aqueous stream
  • Hexavalent chromium
  • Kinetics
  • Reduction
  • Sorbaria sorbifolia extract

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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