TiO₂ is one of the most used materials in the photocatalysis of organic pollutants. It can be prepared by different techniques including electrochemical methods. The influence of the structure of TiO₂ films grown electrochemically using plasma electrolytic oxidation (PEO) was investigated in terms of the photocatalytic activity. The film microstructure and morphology were analyzed and its influence in photocatalytic response was evaluated by photodegradation of ciprofloxacin (CIP). A strong influence of the synthesis temperature on the structural properties (pore diameter and crystallite size) was observed, which could be correlated with the photocatalytic activity change of the synthesized materials. To correlate the structural to the photocatalytic activity, besides Pareto graphs and analysis, a variable called microstructure ratio-SR (pore diameter/crystallite size) was evaluated. Results have shown the F2020005 film (20 mA cm⁻², 20 °C and 0.05 mol L⁻¹) presented the highest photocatalytic activity. As a complementary study, ecotoxicity tests were realized using Lactuca sativa L. seeds and the macrophyte Lemna minor. In these experiments, it was observed that the effluents of the photocatalysis carried out with the materials synthesized by PEO presented lower toxicity, compared to the CIP solution without any treatment. The best results for the degradation of CIP were obtained using films synthesized at higher temperatures. CIP photocatalytic degradation using TiO₂ films grown by PEO was effective, generating byproducts of low toxicity.

TiO ₂是有机污染物光催化中最常用的材料之一。可以通过包括电化学方法的不同技术来制备。TiO ₂结构的影响就光催化活性而言，研究了使用等离子电解氧化（PEO）电化学生长的薄膜。分析了薄膜的微观结构和形貌，并通过环丙沙星（CIP）的光降解评估了其对光催化反应的影响。观察到合成温度对结构性能（孔径和微晶尺寸）的强烈影响，这可能与合成材料的光催化活性变化有关。为了使结构与光催化活性相关联，除了帕累托图和分析之外，还评估了一个称为微结构比率-SR（孔径/微晶尺寸）的变量。结果已示出的F2020005膜（20毫安厘米^-2，20℃和0.05摩尔大号^-1）表现出最高的光催化活性。作为一项补充研究，使用莴苣（Lactuca sativa L.）种子和大型植物Lemna minor进行了生态毒性测试。在这些实验中，观察到，与未经任何处理的CIP溶液相比，用PEO合成的材料进行的光催化流出物具有较低的毒性。使用在较高温度下合成的薄膜可获得CIP降解的最佳结果。使用由PEO生长的TiO ₂膜进行的CIP光催化降解是有效的，产生低毒的副产物。