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Reduction of Hexavalent Chromium Using Sorbaria sorbifolia Aqueous Leaf Extract

Laboratory of Green Chemistry, Lappeenranta University of Technology, Sammonkatu 12 (Innovation Center for Safety and Material Technology, TUMA), 50130 Mikkeli, Finland
Department of Civil and Environmental Engineering, Florida International University, Miami, FL 33174, USA
Regional Centre of Advanced Technologies and Materials (RCPTM), Faculty of Science, Palacky University, Olomouc, Šlechtitelů 11, 783 71 Olomouc, Czech Republic
Author to whom correspondence should be addressed.
Academic Editor: Helmut Martin Hügel
Appl. Sci. 2017, 7(7), 715;
Received: 19 June 2017 / Revised: 5 July 2017 / Accepted: 6 July 2017 / Published: 11 July 2017
(This article belongs to the Section Chemistry)
PDF [2242 KB, uploaded 11 July 2017]


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). View Full-Text
Keywords: hexavalent chromium; aqueous stream; reduction; kinetics; Sorbaria sorbifolia extract hexavalent chromium; aqueous stream; reduction; kinetics; Sorbaria sorbifolia extract

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Dubey, S.P.; Sillanpaa, M.; Varma, R.S. Reduction of Hexavalent Chromium Using Sorbaria sorbifolia Aqueous Leaf Extract. Appl. Sci. 2017, 7, 715.

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