An experimental investigation is here presented on the photo-electrochemical removal of Methyl Orange (MO), selected as a model of the organic dyes, contained in wastewaters. The process is carried out in an electrochemical flow reactor, in which titania nanotubular electrode is irradiated with a simulated solar light. Design of Experiments (DOE) technique is used to plan the experimental campaign and investigate on the single and combined effects of applied current, electrolyte flow rate, and initial MO concentration, on the specific reaction rate. The results of the DOE analysis, also combined with the study of the distribution of the intermediate products, confirm a reaction mechanism mediated by OH radicals; high applied current and low reactant concentration resulted as favourable conditions to achieve high specific reaction rate of color removal.

中文翻译：

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TiO2纳米管光电化学氧化优化偶氮染料去除的实验研究。

本文介绍了对废水中含有的甲基橙（MO）进行光电化学去除的实验研究，甲基橙被选作有机染料的模型。该过程在电化学流动反应器中进行，其中二氧化钛纳米管电极被模拟的太阳光照射。实验设计（DOE）技术用于计划实验活动，并研究施加电流，电解质流速和初始MO浓度对特定反应速率的单一和组合影响。DOE分析的结果，再加上对中间产物分布的研究，证实了由OH自由基介导的反应机理。