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利用溴代十六烷基三甲基铵(CTAB)为模板,合成制备了棒状羟基磷灰石颗粒,并以SEM,XRD,IR等手段进行了表征.用制备的羟基磷灰石与自制的离子液体([BMIM]PF6)充分混合涂覆在玻碳电极表面制备了羟基磷灰石/离子液体修饰电极,研究了镉离子在该修饰电极上的富集和电化学行为.结果发现,羟基磷灰石对镉离子有较好的富集作用,而离子液体则可以在开路条件下使镉离子还原为金属镉,氧化扫描时可以得到镉的灵敏氧化溶出峰,以此为基础建立了一种高选择性地测定痕量镉离子的新方法,该方法可以较好地避免铅、汞、银等重金属离子的干扰,对镉离子检出限可达2.0×10-8mol·L-1,在4.0×10-8～2.2×10-7mol·L-1的浓度范围内,氧化溶出峰电流与Cd(II)的浓度呈良好的线性关系.该研究有望在环境检测和环境治理方面发挥重要作用.
The hydroxyapatite particles were synthesized by using cetyltrimethylammonium bromide (CTAB) as a template, and characterized by SEM, XRD, IR, etc. The prepared hydroxyapatite and self-made The ionic liquid ([BMIM] PF6) was well mixed and coated on the surface of glassy carbon electrode to prepare hydroxyapatite / ionic liquid modified electrode, and the enrichment and electrochemical behavior of cadmium ion on the modified electrode were studied. Apatite has better enrichment effect on cadmium ions, while ionic liquid can reduce cadmium ions to metal cadmium under open-circuit conditions, and the sensitive oxidation and dissolution peak of cadmium can be obtained on oxidation scan. Based on this, a This method can avoid the interference of heavy metals such as lead, mercury, silver and so on. The detection limit of cadmium ion is up to 2.0 × 10-8mol·L-1, In the concentration range of 4.0 × 10-8 ~ 2.2 × 10-7mol·L-1, there is a good linear relationship between the concentration of Cd (II) and the concentration of Cd (II), which is expected to play an important role in environmental testing and environmental management effect.