Ziagova M, Dimitriadis G, Aslanidou D, Papaioannou X, Litopoulou Tzannetaki E, Liakopoulou-Kyriakides M
Faculty of Chemical Engineering, Section of Chemistry, Aristotle University, Thessaloniki 54124, Greece.
Bioresour Technol. 2007 Nov;98(15):2859-65. doi: 10.1016/j.biortech.2006.09.043. Epub 2006 Nov 13.
Biosorption of Cd(II) and Cr(VI) ions in single solutions using Staphylococcus xylosus and Pseudomonas sp., and their selectivity in binary mixtures was investigated. Langmuir and Freundlich models were applied to describe metal biosorption and the influence of pH, biomass concentration and contact time was determined. Maximum uptake capacity of cadmium was estimated to 250 and 278 mg g(-1), whereas that of chromium to 143 and 95 mg g(-1) for S. xylosus and Pseudomonas sp., respectively. In binary mixtures with Cd(II) ions as the dominant species, there is a profound selectivity for cadmium biosorption, reaching 96% and 89% for Pseudomonas sp. and S. xylosus, respectively, at 10 mg l(-1) Cd(II) and 5 mg l(-1) Cr(VI). Interesting, when chromium (VI) ions are the dominant species, there is selectivity towards chromium around 92% with S. xylosus only.
研究了木糖葡萄球菌和假单胞菌对单一溶液中Cd(II)和Cr(VI)离子的生物吸附及其在二元混合物中的选择性。应用朗缪尔和弗伦德利希模型描述金属生物吸附，并确定了pH值、生物量浓度和接触时间的影响。木糖葡萄球菌和假单胞菌对镉的最大吸附量分别估计为250和278 mg g(-1)，而对铬的最大吸附量分别为143和95 mg g(-1)。在以Cd(II)离子为主的二元混合物中，对镉生物吸附具有很高的选择性，在10 mg l(-1) Cd(II)和5 mg l(-1) Cr(VI)时，假单胞菌和木糖葡萄球菌对镉的选择性分别达到96%和89%。有趣的是，当铬(VI)离子为主时，仅木糖葡萄球菌对铬的选择性约为92%。
