Increasing the efficiency of dye degradation is a critical issue for the application for photocatalysis. It is one of the greatest challenges to enhance the utilization of photo generated carriers in semiconductor, especially for sunlight irradiation. In this study, I/C-codoped TiO₂ was synthesized by a simple solvothermal-calcination method. The codoping interstitial carbon and substitutional iodine not only widened the light absorption range of the TiO₂ photocatalysts, but also enhanced the separation of photo-induced carriers. The photocatalytic activities of RhB and MO degradation over the 4-I/C-TiO₂ photocatalyst could reach 98.2% and 94.2% after 25 min visible light irradiation (λ ≥ 400 nm), respectively. Notably, 4-I/C-TiO₂ showed good activity for MO and RhB mixed degradation and could also accomplish the photocatalytic degradation in the above mixed system under natural sunlight irradiation. According to the dark catalytic experiment, I/C-codoping could effectively accelerate the formation of hydroxyl radicals from the generated H₂O₂, which was formed for the enhanced photocatalytic activity of dye degradation. The gained knowledge may provide some insights into the photocatalytic degradation over the codoped TiO₂ catalyst.

对于光催化应用而言，提高染料降解效率是一个关键问题。增强半导体中光生载流子的利用是最大的挑战之一，特别是对于阳光照射。在这项研究中，通过简单的溶剂热煅烧方法合成了I / C掺杂的TiO ₂。间隙碳和碘的共掺杂不仅拓宽了TiO ₂光催化剂的光吸收范围，而且增强了光诱导载流子的分离。25min可见光照射（λ≥400nm）后，在4-I / C-TiO ₂光催化剂上，RhB和MO降解的光催化活性分别达到98.2％和94.2％。值得注意的是，4-I / C-TiO ₂对MO和RhB混合降解表现出良好的活性，并且在上述混合体系中在自然阳光照射下也能完成光催化降解。根据黑暗催化实验，I / C共掺杂可以有效地加速由生成的H ₂ O ₂形成羟基自由基，而H ₂ O ₂是为了增强染料降解的光催化活性而形成的。所获得的知识可以提供对共掺杂TiO ₂催化剂上的光催化降解的一些见解。