In this work, a novel method that homogeneous degrading methyl orange (MO) with methylene blue (MB) as a photosensitizer under visible-light irradiation is proposed. MO can be efficiently degraded at a wide concentration range, and its degradation rate is significantly promoted by increasing MB concentration. The result of EPR, LC-MSMS, TOC and ion chromatography reveals that the degradation mechanism of MO consists two parts: ¹O₂ mediated Type II pathway and Type I photosensitization of involving direct electron transfer between ³MB* and MO. Furthermore, benefitting from the self-degradation of MB, synchronous removal of MO and MB in water can be realized by controlling the initial MB concentration in system, thus avoiding the problems faced by heterogeneous photocatalytic such as solid-liquid separation. Therefore, this cost-effective and easy method possesses great potential in the application of eliminating MO and MB from wastewater as well as provides a new strategy for sustainable water treatment.

在这项工作中，提出了一种在可见光照射下用亚甲基蓝（MB）作为光敏剂均匀降解甲基橙（MO）的新方法。可以在较宽的浓度范围内有效降解MO，并且通过提高MB浓度可以显着促进其降解速率。EPR，LC-MSMS，TOC和离子色谱的结果表明，MO的降解机理包括两个部分：¹ O ₂介导的II型途径和I型光敏化，涉及³之间的直接电子转移。MB *和MO。此外，得益于MB的自降解，通过控制系统中MB的初始浓度，可以实现水中MO和MB的同步去除，从而避免了非均相光催化面临的固液分离等问题。因此，这种具有成本效益且简便易行的方法在消除废水中的MO和MB方面具有巨大的潜力，并为可持续水处理提供了新的策略。