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Biosorption of hexavalent chromium from aqueous solution by six brown macroalgae
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2013 (English)In: Desalination and Water Treatment, ISSN 1944-3994, E-ISSN 1944-3986, Vol. 51, no 31-33, 6021-6030 p.Article in journal (Refereed) Published
Abstract [en]

The biosorption potential of six brown macroalgae viz. Nizamuddina zanardinii, Stoechospermum marginatum, Cystoseira indica, Dictyota cervicornis, Padina australis, and Sargassum glaucescens, for the removal of hexavalent chromium (Cr(VI)) was investigated in the present study. Optimum conditions were determined by studying the effect of initial solution pH, biomass dosage, initial Cr(VI) concentration, and contact time on Cr(VI) removal by the macroalgae. Cr(VI) sorption was found to be highly pH dependent and maximum sorption was obtained at pH 1.0. Freundlich isotherm model showed the best fit with the equilibrium data. The removal rate of Cr(VI) was relatively rapid during the first 30min, although the rate decreased gradually and the sorption reached equilibrium in about 70min for S. marginatum, 90min for N. zanardinii, and 150min for D. cervicornis, P. australis, S. glaucescens, and C. indica. Different kinetic models such as pseudo-first-order, pseudo-second-order, and intra-particle diffusion model were tested, and the experimental data was in agreement with the pseudo-second-order model. The results of the present study suggest that brown macroalgae could be used as effective biosorbents for Cr(VI) removal from aqueous solution.

Place, publisher, year, edition, pages
2013. Vol. 51, no 31-33, 6021-6030 p.
Keyword [en]
Biosorption, Brown macroalgae, Biosorbents, Hexavalent chromium, Water treatment
National Category
Environmental Sciences
Research subject
Environmental Science, Environmental technology
Identifiers
URN: urn:nbn:se:lnu:diva-30653DOI: 10.1080/19443994.2013.764353ISI: 000325921700014Scopus ID: 2-s2.0-84886431773OAI: oai:DiVA.org:lnu-30653DiVA: diva2:666385
Available from: 2013-11-22 Created: 2013-11-22 Last updated: 2017-12-06Bibliographically approved

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Bhatnagar, Amit

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