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Hexavalent chromium removal from aqueous solution by adsorbents prepared from seaweed Cystoseira tamariscifolia

T.Ainane, M.Kabbaj, A.Abourriche

The objective of this study is to assess the uptake of hexavalent chromium fromaqueous solutions onto Cystoseira tamariscifolia algae rawand chemically modified. The biosorption data of hexavalent chromium by marine brown algae Cystoseira tamariscifolia, which was raw (RC) and chemicallymodified by hydrochloric acid (AC), has been used for kinetic studies based on fractional power, Elovich, pseudo-first order, pseudo-second order and intraparticle diffusion rate expressions. Four parameter biosorption isotherm models, Freundlich, Langmuir, Dubinin – Radushkevich, Temkin are tested for their applicability. The time-dependent Cr(VI) biosorption data were well-described by fractional power and Elovich kinetic model. Among the two-parameter models, the Langmuir model produces the best fit. Comparing our results with other previous work on the brown algae, shows the value of materials developed from Cystoseira tamariscifolia and allows us to offer them as adsorbent materials.