Universidad Tecnológica del Valle de Toluca, Carretera del Departamento del D.F. Km 7.5, Santa María Atarasquillo, C.P. 52050, Lerma, Mexico.
J Environ Manage. 2012 Dec 15;112:120-7. doi: 10.1016/j.jenvman.2012.07.009. Epub 2012 Aug 11.
Trivalent chromium and iron are the products of the traditional reduction of hexavalent chromium by ferrous salts in industrial wastewater. Although there have been a few studies of Cr(III) adsorption, none have considered the effect of Fe(III) on Cr(III) adsorption in a binary system representing expected products of hexavalent chromium in industrial wastewater. The biosorption of Cr(III) and Fe(III) ions onto pretreated ground orange peel in single and binary systems was studied in batch experiments using a variety of techniques. The kinetic results showed a rapid rate of biosorption of Cr(III) and Fe(III) in single and binary systems and mutual interference effects in the competitive binary Cr(III)-Fe(III) system. Second order kinetic models showed the best fit for all systems. The behavior of competitive Cr(III)-Fe(III) biosorption were successfully described by the multicomponent Langmuir model, obtaining maximum capacities for Cr(III) and Fe(III) of 9.43 and 18.19 mg/g respectively. SEM/EDS results confirmed that the metals adsorb on the surface and FTIR identified the hydroxyl groups on the carboxylic acids as the active binding sites.
三价铬和铁是工业废水中二价铁盐将六价铬还原的产物。尽管已经有一些关于 Cr(III)吸附的研究，但没有一项研究考虑过在二元体系中 Fe(III)对 Cr(III)吸附的影响，而该二元体系代表了工业废水中六价铬的预期产物。采用多种技术，在批处理实验中研究了预处理过的磨碎橙皮对单一和二元体系中 Cr(III)和 Fe(III)离子的生物吸附。动力学结果表明，Cr(III)和 Fe(III)在单一和二元体系中的吸附速度很快，并且在竞争的二元 Cr(III)-Fe(III)体系中存在相互干扰效应。二阶动力学模型对所有体系的拟合效果最好。竞争 Cr(III)-Fe(III)生物吸附的行为可以通过多组分 Langmuir 模型成功描述，分别获得 Cr(III)和 Fe(III)的最大容量为 9.43 和 18.19 mg/g。SEM/EDS 结果证实金属吸附在表面上，FTIR 确定了羧酸上的羟基作为活性结合位点。
