一种西夫碱配合物对煤中金属离子的选择性络合

Selectively binding property of a Schiff base complex to metal ions in coal

合成了一种新型西夫碱配体及相应的钴配合物,并用核磁、质谱及元素分析等手段对它们进行了表征。从煤炭工业可能迁移到周边环境中的常见金属离子中选取有代表性的5种,用紫外可见分光光度法分别测定了它们与该配合物所形成络合物的吸收光谱,进而通过非线性拟合和计算得出相应的络合常数Ks。结果表明该配合物对金属离子的吸附具有选择性,顺序为Cd2+>Zn2+>Ca2+≈Mg2+>Na+。由于该种西夫碱配合物对多种金属离子均存在络合作用且对于有害的重金属比如镉离子络合能力更强,显示它是一种潜在的重金属离子处理剂。

A novel Schiff base ligand and its corresponding cobalt complex were synthesized and characterized via NMR,mass spectroscopy and elemental analysis. From the common metal ions which were liable to transfer into the environment in coal industry,5 typical ones were selected and the UV-Vis spectra for the complexation between them and the complex were determined by ultraviolet-visible spectrophotometry. Furthermore,the corresponding binding constants Kswere obtained by a nonlinear least-squares fit and calculation. Results of complex binding metal ions show a clear selectivity order of Cd2 ＋ Zn2 ＋ Ca2 ＋≈ Mg2 ＋ Na＋. The results suggest that the complex is a potentially treatment reagent for heavy metal ions due to its binding property to various metal ions as well as the presenting of a relatively stronger binding ability to harmful heavy metal such as cadmium ion.