纳米ZnO修饰铝电极深度去除污水中的甲基硅氧烷

ADVANCED TREATMENT OF METHYLSILOXANES IN WASTEWATER BY USING NANO ZnO MODIFIED ALUMINUM ELECTRODE

采用溶胶凝胶涂覆法将纳米ZnO负载到铝极板表面,将所制极板用于光电催化降解环状挥发性甲基硅氧烷的研究,考察电解时间、极板两端电压和极板间距等参数对处理效果的影响。实验结果表明:纳米ZnO均匀地涂覆到Al极板表面,颗粒分布均匀,结合紧密。在最佳工艺参数条件下,电解时间为60 min,极板两端电压为2 V,极板间距为0.8 cm,荧光灯为40 W时,六甲基环三硅氧烷(D3)、八甲基环四硅氧烷(D4)、十甲基环五硅氧烷(D5)、十二甲基环六硅氧烷(D6)的去除率达到了58.3%、65.1%、46.6%和49.5%,处理效果显著。同等条件下,纳米ZnO极板在光电催化反应体系中对硅氧烷的降解率远高于电催化反应体系,且反应过程属于非线性反应,可由Logistic函数进行拟合分析。

The nano ZnO was loaded onto the surface of the aluminum plate via the sol-gel coating method in order to investigate the influencing factors including the electrolysis time, voltage and plate distance on the degradation of cyclic volatile methylsiloxane by using photoelectrocatalytic reaction system. The experimental results showed that nano-ZnO was uniformly coated on the surface of Al plate and the particles were evenly distributed and bonded tightly. Under the optimum conditions that the electrolysis time was 60 min, the voltage between the plates was 2 V and electrodes distance was 0.8 cm, the intensity of fluorecent was 40 W, the removal efficiencies of D3, D4, D5 and D6 were 58.3%, 65.1%, 46.6%, and 49.5%, respectively. In addition, the degradation rate of methylsiloxane in the photoelectrocatalytic reaction system was much higher than that of the electrocatalytic reaction system, and the reaction process was belong to nonlinear reaction that fitted to Logistic function.