Botany and Microbiology Department, Faculty of Science, Assiut University, 71516 Assiut, Egypt.
Environ Toxicol Pharmacol. 2016 Sep;46:116-121. doi: 10.1016/j.etap.2016.07.008. Epub 2016 Jul 18.
The current study tends to investigate the removal of cadmium and copper ions by Merismopedia tenuissima, grown in different concentrations of cadmium and copper ions, as well to investigate their effects on growth and metabolism. Sorption isotherms of Langmuir and Freundlich were obtained for the quantitative description of cadmium and copper uptake by M. tenuissima. Langmuir model adequately to describe the data of biosorption for these metals. However, the Freundlich model could work well in case of Cu(2+) only. M. tenuissima appears to be more efficient for removing Cd(2+) ions than Cu(2+). However, the affinity constant of Cu(2+) on the biomass of M. tenuissima was higher than Cd(2+) indicating that M. tenuissima is more tolerant to Cd(2+) phytotoxicity than Cu(2+). FTIR analysis of algae with and without biosorption revealed the presence of carboxyl, amino, amide and hydroxyl groups, which were responsible for biosorption of Cd(+2) and Cu(+2) ions.
本研究旨在研究微囊藻在不同浓度镉和铜离子中的生长情况，以及它们对生长和代谢的影响，以去除镉和铜离子。采用朗缪尔（Langmuir）和弗雷德里希（Freundlich）吸附等温线对微囊藻对镉和铜的吸附进行定量描述。朗缪尔模型能够很好地描述这些金属的生物吸附数据。然而，只有在铜（2+）的情况下，弗里德里希模型才能很好地发挥作用。微囊藻对 Cd（2+）离子的去除效率明显高于 Cu（2+）。然而，Cu（2+）在微囊藻生物质上的亲和常数高于 Cd（2+），表明微囊藻对 Cd（2+）的植物毒性比 Cu（2+）更具耐受性。对吸附前后藻类的傅里叶变换红外（FTIR）分析表明，存在羧基、氨基、酰胺和羟基，这些基团负责 Cd（+2）和 Cu（+2）离子的吸附。
