铁氰化镍的磁性纳米粒子合成及化学修饰电极的制备

Synthesis of Magnetic Nickelous Hexacyanoferrate Hanoparticles and Preparation of Modified Electrodes

将镍粒子表面功能化,合成了磁性纳米铁氰化镍(NiHCF)粒子,制备了磁性NiHCF修饰磁控玻碳电极。在pH=7.4的磷酸盐缓冲溶液中,磁性NiHCF纳米粒子修饰电极对水合肼氧化有显著的催化作用,NiHCF的氧化峰电流与水合肼浓度在0～1.29×10-4mol/L范围内呈良好的线性关系(安培法),检出限为2.1×10-8mol/L。研究了磁性NiHCF粒子修饰电极对水合肼的电化学响应以及电极的性能,并将其应用于水样中肼的测定。该修饰电极具有灵敏度高、选择性好、电极易更新、稳定性好和制作简单等优点。

Nickelous hexacyanoferrate（NiHCF） was prepared by functionalization of the nano-nickel surface. Then the magnetic controllable nano-NiHCF electrode was prepared by modifying a glassy carbon electrode with nano-NiHCF via magnetic force. In the phosphate buffer solution （ pH = 7.4） , the electrode exhibits an excellent catalytic effect on the oxidation of hydrazine hydrate. The oxidation peak currents of hydrazine hydrate showed a good linear relationship （ r = 0. 9987 ） within the range of 0 ～1.29 ×10 -4 mol/L, with a detection limit of 2. 1 ×10 -8 mol/L. The electrochemical performance of hydrazine hydrate on the magnetic nano-NiHCF modified electrode was studied. The method was used for the determination of hydrazine hydrate in samples. The modified electrode has the advantages of high sensitivity, selectivity, stability, and it is also easily prepared and renewable.