CuO修饰TiO_2纳米管的制备及用于COD的测定

Preparation of the CuO Modified TiO_2 Nanotubes and Application of COD Detection

采用阳极氧化的方法在钛基体上得到TiO2纳米管，通过氧化铜的掺杂对其进行改性．基于其光催化氧化机理，结合分光光度法，建立CuO／TiO2-K2Cr2O7协同光催化氧化体系，用以简便测定水样的COD值．研究结果表明：电沉积时间200s、煅烧温度450℃、K2Cr2O7初始物质的量浓度0．02mol／L、pH1、反应温度60℃、反应时间15min为最佳实验条件；COD在10～300mg／L范围内与吸光度变化值呈较好的线形关系，其用于实际水样的测定效果良好，相对误差在5%以内．

A nano TiO2 film was fabricated on the surface of titanium substrate by anodic oxidation, and then was modified by CuO to improve its performance. Based on the photocatalytic mechanism,a CuO/ TiO2-K2Cr2O7 synergetic photocatalytic oxidation system was developed to realize simple and convenient detection of COD. Under the optimized conditions of deposition time of 200 s, calcination temperature of 450 ℃, initial concentration of Cr（Ⅵ） 0.02 mol/L,pH-1, reaction temperature of 60 ℃, reaction time of 15 min, the absorbance of the solution can respond linearly to COD value in the range of 10-300 mg/L. The relative standard deviations were less than 5% when applied to detection of real water samples,show- ing the satisfactory feasibility.