School of Chemical Engineering, University of Campinas, Cidade Universitária Zeferino Vaz, 13083-970 Campinas, SP, Brazil; Centre des Matériaux des Mines d'Alès (C2MA/MPA/BCI), Ecole des mines d'Alès, 6 avenue de Clavières, F-30319 Alès Cedex, France.
Institut des sciences analytiques et de physico-chimie pour l'environnement et les matériaux (IPREM), Université de Pau et des Pays de l'Adour, 2 avenue Président Angot, F-64053 Pau, France.
Bioresour Technol. 2014 Jul;164:264-9. doi: 10.1016/j.biortech.2014.04.103. Epub 2014 May 9.
The alginate extraction products from Brazilian brown seaweed Sargassum filipendula were studied for chromium biosorption. Batch experiments were conducted at pH 2 and 3 and 20°C to determine the sorption capacity of this biosorbents for chromium (VI) and (III). The biomass was characterized before and after metal binding by X-ray photoelectron spectroscopy (XPS) in order to determine the mechanisms of chromium biosorption. The residue has a high adsorption capacity, close the value obtained with seaweed and higher than that of alginate for both Cr(III) and Cr(VI). XPS analysis of the biosorbents revealed that carboxyl, amino and sulfonate groups are responsible for the binding of the metal ions. The analysis also indicated that the Cr(VI) bound to the biomass was reduced to Cr(III).
从巴西褐藻马尾藻中提取的褐藻胶提取产物被研究用于铬的生物吸附。在 pH 值为 2 和 3 及 20°C 的条件下进行批量实验，以确定该生物吸附剂对铬（VI）和（III）的吸附能力。通过 X 射线光电子能谱（XPS）对金属结合前后的生物质进行了表征，以确定铬的生物吸附机理。残渣具有很高的吸附能力，与海藻的值接近，并且对于 Cr(III) 和 Cr(VI)，其吸附能力均高于海藻酸钠。生物吸附剂的 XPS 分析表明，羧基、氨基和磺酸基是与金属离子结合的原因。分析还表明，与生物质结合的 Cr(VI)被还原为 Cr(III)。
