Selective aerobic oxidation of sulfides by cooperative polyimide-titanium dioxide photocatalysis and triethylamine catalysis.,Journal of Colloid and Interface Science

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Selective aerobic oxidation of sulfides by cooperative polyimide-titanium dioxide photocatalysis and triethylamine catalysis.
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2020-01-16 , DOI: 10.1016/j.jcis.2020.01.046
Wenlong Sheng ₁ , Ji-Long Shi ₁ , Huimin Hao ₁ , Xia Li ₁ , Xianjun Lang ₁

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The selective aerobic oxidation of sulfides is highly attractive for modern organic and pharmaceutical synthesis. Thus, there is an urgent need for exploring new photocatalytic system on this reaction. In this work, we investigated the polyimide-titanium dioxide (Aeroxide P25 TiO2, denoted as P25) photocatalyst in visible light-driven selective aerobic oxidation of sulfides. Polyimide-P25 shows enhanced absorption of visible light. Subsequently, this makes polyimide-P25 exhibits observable photocatalytic activity on visible light-driven selective aerobic oxidation of sulfides while pure polyimide and P25 individually have none. Aided by triethylamine (TEA), the yield of sulfoxide by polyimide-P25 photocatalysis reaches more than 3 folds compared to that without TEA, highlighting the remarkable cooperative effect between polyimide-P25 photocatalysis and TEA catalysis. Moreover, a plausible mechanism is figured out based on the quenching control experiments, kinetic studies and in-situ electron paramagnetic resonance (EPR) tests. This work could provide useful guidance for the rational design of hybrid photocatalysts to undertake challenging selective chemical transformations.

中文翻译：

通过协同聚酰亚胺-二氧化钛光催化和三乙胺催化选择性硫化物的需氧氧化。

硫化物的选择性好氧氧化对于现代有机和药物合成非常有吸引力。因此，迫切需要探索对该反应的新的光催化体系。在这项工作中，我们研究了可见光驱动的硫化物选择性好氧氧化过程中的聚酰亚胺-二氧化钛（Aeroxide P25 TiO2，表示为P25）光催化剂。聚酰亚胺-P25显示出对可见光的增强吸收。随后，这使得聚酰亚胺-P25对可见光驱动的硫化物选择性好氧氧化表现出可观察到的光催化活性，而纯聚酰亚胺和P25则分别没有。与没有TEA相比，在三乙胺（TEA）的辅助下，聚酰亚胺-P25光催化的亚砜收率达到了三倍以上，突出了聚酰亚胺-P25光催化与TEA催化之间的显着协同作用。此外，基于淬火控制实验，动力学研究和原位电子顺磁共振（EPR）测试，可以找到合理的机理。这项工作可为合理设计杂化光催化剂进行具有挑战性的选择性化学转化提供有用的指导。

更新日期：2020-01-17

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