期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2015
卷号：6
期号：8
页码：2229-2238
出版社：University of Mohammed Premier Oujda
摘要：Chromium is one of the problematic heavy metals which is produced by various industries. Particularly, hexavalent chromium is an acute carcino gen and more mobile and toxic than trivalent chromium. In this work, the experimental parameters that affect the sorption process of hexavalent chromium by raw biomass of the brown seaweed H alopteris scoparia (Ochrophyta, Phaeophyceae) using batch tests was studied (pH, biomass dosage, contact time, initial metalloid concentration). The elimination of hexavalent chromium was strictly pH dependent, and maximum sorption was obtained at more acidic pH (1-2). The chromium abatement rate exceeds 90% from the first minutes before reaching equilibrium fro m 15 minutes contact time. The sorption capacity at different initial chromium ion concentrations ranging from 10 to 250 mg/L approximates a total removal (85 - 100%) while the removal efficiency surrounds 40% for concentrations higher than 300 mg/L suggesting the saturatio n of binding sites of the biomass at higher concentratio n levels. The isotherm data were found to be well fitted by linear Langmuir equation. Pseudo-second order model was found appropriate to explain the adsorption kinetics more effectively. This study suggests that the brown seaweed Halopteris scoparia could be used as an effective biosorbant for hexavalent chromium removal from aqueous solution.
