This study provides new insight into the implementation and synergy effect of coupling in sequences of the photocatalysis ([TiO₂-UVC]), ozone (O₃) and hydrogen peroxide (H₂O₂) applied to degradation and mineralization of a model compound such as caffeine (in synthetic solution and industrial wastewater). The system consists of an annular photoreactor coupled to two venturi valves with a continuous dosage of O₃ and H₂O₂, the combination of binary processes such as O₃/H₂O₂, TiO₂/O₃ and UVC/H₂O₂ was evaluated, as well as the coupling of TiO₂/O₃/H₂O₂/UVC in order to estimate all the possible synergy effects. It was found that the coupling between photocatalysis and hydrogen peroxide shows a negligible performance of caffeine treatment in both synthetic and real wastewater because the reaction rate, degradation and mineralization of caffeine does not improve considerably compared to the photocatalysis process alone. Meanwhile, the coupling between photocatalysis and ozonation shows the highest synergy effect. The coupling of all the processes evaluated TiO₂/O₃/H₂O₂/UVC achieved 100% degradation of caffeine, but the mineralization was lower than photocatalysis coupled with ozonation. This could be due to the peroxide and ozone compete by active sites of the catalyst and can also act as scavengers of oxidizing species, hindering the caffeine mineralization. The results show that the combination of photocatalysis with ozone and peroxide can make a synergy effect for industrial wastewater treatment.

这项研究为光催化（[TiO ₂ -UVC]），臭氧（O ₃）和过氧化氢（H ₂ O ₂）在模型化合物的降解和矿化中的顺序实现和协同效应提供了新的见解。例如咖啡因（在合成溶液和工业废水中）。该系统由一个环形光反应器组成，该光反应器与两个具有连续剂量的O ₃和H ₂ O _2的文丘里阀相连，并结合了诸如O ₃ / H ₂ O ₂，TiO ₂ / O ₃和UVC / H ₂这样的二元过程Ø评估₂，以及TiO ₂ / O ₃ / H ₂ O ₂ / UVC的偶联，以估计所有可能的协同效应。发现光催化和过氧化氢之间的偶合在合成废水和实际废水中都显示出微不足道的咖啡因处理性能，因为与单独的光催化过程相比，咖啡因的反应速率，降解和矿化没有明显改善。同时，光催化和臭氧化之间的耦合显示出最高的协同作用。所有工艺的耦合均评估了TiO ₂ / O ₃ / H ₂ O ₂/ UVC实现了100％的咖啡因降解，但矿化度低于光催化和臭氧化作用。这可能是由于过氧化物和臭氧通过催化剂的活性位点竞争，并且还可以充当氧化物质的清除剂，从而阻碍咖啡因的矿化。结果表明，光催化与臭氧和过氧化物的结合可以对工业废水产生协同作用。