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通过在C—O—Si键在电化学活化玻碳电极表面自组装3-氨丙基三甲氧基硅烷(3-aminopropyltrimethoxysilane,APMS),再于其表面连接Keggin型结构杂多酸阴离子PMo12O403-,制备了复合膜修饰玻碳电极,采用XPS和循环伏安法研究了复合膜的基本性质。结果表明,PMo12O403-通过库仑作用力与APMS的表面—NH2结合(PMo12O403--APMS),可极大提高电极的稳定性,与溶液中的PMo12O403-相比,PMo12O403--APMS修饰电极表现出具有较小峰-峰分裂的PMo12O403-的三对可逆氧化还原过程,并能在较大pH范围内保持稳定。研究了修饰电极对ClO3-、BrO3-、IO3-还原的催化性能,与PMo12O403-修饰玻碳电极相比,该电极对三种离子均具有良好的电催化活性,对应的检出限分别为1.5×10-5、1.0×10-6、5×10-7mol/L。
The 3-aminopropyltrimethoxysilane (APMS) was self-assembled on the surface of electrochemically activated glassy carbon electrode by the C-O-Si bond, and the surface of the polymer was connected with PMo12O403-, A composite membrane modified glassy carbon electrode was prepared. The basic properties of the composite membrane were studied by XPS and cyclic voltammetry. The results showed that the PMo12O403 - by the Coulomb force and APMS surface - NH2 binding (PMo12O403 - APMS), can greatly improve the stability of the electrode, compared with the solution of PMo12O403-, PMo12O403 - APMS modified electrode showed a Three pairs of reversible redox processes of smaller peak-split PMo12O403- and remained stable over a wide pH range. The catalytic performance of the modified electrode for ClO3-, BrO3-, IO3-reduction was studied. Compared with the PMo12O403-modified glassy carbon electrode, the electrode exhibited good electrocatalytic activity for all three ions with the corresponding detection limits of 1.5 × 10 -5, 1.0 × 10 -6, 5 × 10 -7 mol / L.