Náfrádi Máté, Alapi Tünde, Farkas Luca, Bencsik Gábor, Kozma Gábor, Hernádi Klára
Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
Department of Physical Chemistry and Materials Science, University of Szeged, Rerrich Béla tér 1, H-6720 Szeged, Hungary.
Materials (Basel). 2021 Dec 22;15(1):49. doi: 10.3390/ma15010049.
The comparison of the efficiency of the commercially available photocatalysts, TiO and ZnO, irradiated with 365 nm and 398 nm light, is presented for the removal of two antibiotics, sulfamethazine (SMT) and sulfamethoxypyridazine (SMP). The OH formation rate was compared using coumarin, and higher efficiency was proved for TiO than ZnO, while for 1,4-benzoquinone in O-free suspensions, the higher contribution of the photogenerated electrons to the conversion was observed for ZnO than TiO, especially at 398 nm irradiation. An extremely fast transformation and high quantum yield of SMP in the TiO/LED process were observed. The transformation was fast in both O containing and O-free suspensions and takes place via desulfonation, while in other cases, mainly hydroxylated products form. The effect of reaction parameters (methanol, dissolved O content, HCO and Cl) confirmed that a quite rarely observed energy transfer between the excited state P25 and SMP might be responsible for this unique behavior. In our opinion, these results highlight that "non-conventional" mechanisms could occur even in the case of the well-known TiO photocatalyst, and the effect of wavelength is also worth investigating.
本文介绍了市售光催化剂TiO和ZnO在365 nm和398 nm光照下对两种抗生素磺胺二甲嘧啶（SMT）和磺胺甲氧哒嗪（SMP）的去除效率比较。使用香豆素比较了OH的生成速率，结果表明TiO的效率高于ZnO；而对于无氧悬浮液中的1,4-苯醌，观察到ZnO的光生电子对转化的贡献高于TiO，尤其是在398 nm光照下。在TiO/LED体系中观察到SMP的极快速转化和高量子产率。在有氧和无氧悬浮液中，转化都很快，且通过脱硫发生，而在其他情况下，主要形成羟基化产物。反应参数（甲醇、溶解氧含量、HCO和Cl）的影响证实，激发态P25和SMP之间很少观察到的能量转移可能是这种独特行为的原因。我们认为，这些结果突出表明，即使在著名的TiO光催化剂的情况下，也可能发生“非常规”机制，波长的影响也值得研究。
