【摘要】 以自制的负载Sb掺杂Sn O2的陶瓷颗粒为粒子电极,构建三维电极体系,对其处理活性艳红X-3B废水的效能进行研究,并借助于循环伏安曲线、羟基自由基的荧光光谱检测技术对三维粒子电极体系的电催化氧化机制进行研究。结果表明,优化槽电压为13 V,处理时间为60 min时,三维电极体系对活性艳红X-3B废水的COD去除率和相应能耗分别为85.6%与16.8 k W·h/(kg COD),与二维电极体系相比COD去除率提高了32.9%,能耗降低了33.3%。UV-Vis吸收光谱分析表明电催化氧化技术可以破坏活性艳红X-3B分子中的偶氮键、苯环和萘环,将大分子降解为小分子。电催化氧化机制研究表明,在本实验条件下三维电极主要通过间接氧化而不是直接氧化提高电催化氧化效能,即在三维粒子电极体系中羟基自由基的产生量多于二维电极体系,从而实现高效低耗处理活性艳红X-3B废水。更多还原

【Abstract】 To study its treatment efficiency of dealing with reactive brilliant red X-3B wastewater,three-dimensional( 3D) electrode system was established using self-made ceramic ring loading Sb doped Sn O2 as particle electrode. Meanwhile,the oxidation mechanism of 3D particle electrode was also studied by means of cyclic voltammetry and fluorescence spectra technology for detecting the amount of hydroxyl radical. The results indicated that under the optimal cell voltage of 13 V,reaction time of 60 min,the chemical oxygen demand( COD) removal rate and energy consumption of reactive brilliant red X-3B were 85. 6% and 16. 8 k W·h /( kg COD),respectively. Compared to the two-dimensional( 2D) electrode system,the COD removal rate increased by 32. 9% while the energy consumption reduced by 33. 3%. Additionally,it can be inferred from UV-Vis absorption spectra that the azo bond,benzene ring and naphthaline ring of reactive brilliant red X-3B were destroyed via electrocatalytic oxidation so that the macromolecular organics were degraded into micromolecular organics. Electrocatalytic oxidation mechanism illustrated that under these experimental conditions,the electrocatalytic oxidation efficiency was enhanced by indirect oxidation rather than direct oxidation. In other words,more amounts of hydroxyl radical was produced in 3D particle electrode system than in 2D particle electrode system,which contributed to high efficiency and low energy consumption to degrade reactive brilliant red X-3B.更多还原