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用电聚合方法制备了聚苯胺掺杂磷钼杂多酸(PAn/PMo_(12))膜修饰电极,该电极对溶液中的碘酸根(IO_3~-)离子有好的电流响应,并构建了纳米 TiO_2-KIO_3光催化氧化协同体系降解水体中的有机物,用修饰电极测定在光催化降解水样过程中 IO_3~-浓度的变化,进而建立了测定水样中化学需氧量(COD)的新方法。研究结果表明,在50～500mg/L COD 的范围内,电流响应与标准水样中的 COD 值成良好的线性关系,检出限为20mg/L。本方法具有快速、简便、环境友好等优点,将本方法与 COD 国家标准分析法比对具有好的相关性。
Polyaniline-doped phosphomolybdic heteropolyacid (PAn / PMo_ (12)) modified electrode was prepared by electropolymerization. The electrode has good current response to the iodate (IO_3 ~ -) ions in the solution, Nano-TiO_2-KIO_3 photocatalytic oxidation synergistic system degradation of organic matter in water, with modified electrode determination of photocatalytic degradation of water samples IO_3 ~ - concentration changes, and then established a determination of water samples of chemical oxygen demand (COD) of the new method. The results showed that there was a good linear relationship between the current response and the COD value of standard water samples in the range of 50 ~ 500mg / L COD with the detection limit of 20mg / L. The method has the advantages of fastness, simplicity, environmental friendliness and the like, and has good correlation with the COD national standard analysis method.