This work presents a solution for the photocatalytic degradation of the antibiotic ciprofloxacin (CIP) in water, without using P25 TiO₂ powder and thus getting rid of expensive separation steps. It consists in using a TiO₂ coating that is directly deposited on the optical window of a photocatalytic micro-reactor and 365 nm UV LEDs as radiation source. P25 TiO₂ powder was also studied as reference. HPLC-MS was used to determine the transformation products and the pathways reactions. CIP was slowly degraded by the photolysis reaction at 365 nm: (75 % removal after 8 h of UV irradiation). However, no significant decrease of the total organic carbon (TOC) was noticed, thus showing the presence of transformation products not degraded by the action of UV-light alone. For a low catalyst amount (i.e 0.12 g of TiO₂, whatever the form, powder or coating, per liter of contaminated water,), excellent CIP degradation by photocatalysis was observed. Complete CIP degradation after 1 h of irradiation was required using P25 and 8 h using TiO₂ coating. Different preferential reaction pathways were identified for both TiO₂ catalysts. The Langmuir-Hinshelwood model showed a very good representation of the kinetics, unlike its simplified pseudo-first order model. Photocatalysis experiments did not show a complete mineralization (60–70 % of TOC removal), but most of the aromatic transformation products were degraded. The last transformation products were identified as small aliphatic acids. There is therefore a real interest in using MOCVD coating of TiO₂ for sustainable wastewater treatment to avoid expensive catalyst separation. A study with a spiked real effluent from a wastewater treatment plant was performed and a satisfactory degradation was obtained. Slower kinetics were found due to the presence of additional organic products and scavenger compounds such as HCO₃⁻.

这项工作提出了一种无需使用P25 TiO ₂粉末即可在水中光催化降解抗生素环丙沙星（CIP）的解决方案，从而摆脱了昂贵的分离步骤。它包括使用直接沉积在光催化微反应器的光学窗口上的TiO ₂涂层和365 nm UV LED作为辐射源。P25 TiO ₂还研究了粉末作为参考。HPLC-MS用于确定转化产物和途径反应。CIP通过在365 nm处的光解反应缓慢降解：（UV照射8 h后去除了75％）。但是，没有发现总有机碳（TOC）的显着降低，因此表明存在仅受紫外线作用不会降解的转化产物。对于低催化剂量（即，每升受污染的水0.12 g TiO ₂，无论其形式，粉末或涂层如何），观察到了光催化导致的出色CIP降解。使用P25辐照1 h后需要完全的CIP降解，而使用TiO ₂涂层则需要8 h完全降解。确定了两种TiO的不同优先反应途径_2种催化剂。Langmuir-Hinshelwood模型显示出很好的动力学表示，与其简化的伪一阶模型不同。光催化实验没有显示出完全的矿化作用（TOC去除量的60-70％），但是大多数芳族转化产物都被降解了。最后的转化产物被鉴定为小的脂肪酸。因此，真正感兴趣的是将TiO _2的MOCVD涂层用于可持续的废水处理，以避免昂贵的催化剂分离。进行了废水处理厂真实废水加标的研究，并获得了令人满意的降解效果。较慢的动力学，发现由于额外的有机产品和如HCO清除剂化合物的存在₃ ^- 。