1D titanate (H₂Ti₃O₇) nanotubes were prepared by a hydrothermal treatment of TiO₂ under 10 M NaOH and ensuing acid exchange process. Here, it is discovered that H₂Ti₃O₇ nanotubes can facilitate the merger of organic photocatalysis and TEMPO catalysis. Confined within H₂Ti₃O₇ nanotubes, the organic photocatalyst erythrosin B (ErB) could drive the highly selective aerobic oxidation of sulfides under irradiation of green light-emitting diodes (LEDs), when 0.5 mol% of TEMPO was added as a co-catalyst. The turnover number (TON) for photocatalytic selective aerobic oxidation of thioanisole in terms of ErB is 2450, which is hitherto the best reported TON. Apart from confining the successful merger of ErB photocatalysis and TEMPO catalysis, H₂Ti₃O₇ nanotubes not only activate O₂ to generate superoxide anion radical (O₂˙⁻), but also ensure high selectivity of sulfoxides with their abundant surface hydroxyl groups. This work represents a crucial step forward in selective oxidation reactions by materials design of dye-semiconductor assembly photocatalysts.

中文翻译：

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钛酸酯纳米管在有机光催化和TEMPO催化作用下的结合，用于硫化物的高选择性好氧氧化

通过在10 M NaOH下对TiO ₂进行水热处理，然后进行酸交换工艺，制备了一维钛酸酯（H ₂ Ti ₃ O ₇）纳米管。在此，发现H ₂ Ti ₃ O ₇纳米管可以促进有机光催化和TEMPO催化的合并。限制在H ₂ Ti ₃ O _7内当添加0.5 mol％的TEMPO作为助催化剂时，有机光催化剂赤藓红B（ErB）在纳米管中可驱动绿色发光二极管（LED）照射下硫化物的高选择性好氧氧化。以ErB表示的硫代苯甲醚的光催化选择性好氧氧化的周转率（TON）为2450，这是迄今为止报道最多的TON。除了限制ERB光催化和TEMPO催化的成功合并，H ₂的Ti ₃ ö ₇碳纳米管不仅激活Ò ₂生成超氧阴离子自由基（O ₂ ˙ ^-），还可以确保亚砜具有丰富的表面羟基，从而具有很高的选择性。这项工作代表了通过染料-半导体组装光催化剂的材料设计在选择性氧化反应中迈出的关键一步。