Hybridizing Engineering Strategy Of Non-Lacunary (Nbu(4)N)(4)W10o32 By Carbon Quantum Dot With Remarkably Enhanced Visible-Light-Catalytic Oxidation Performance

This paper discloses an efficient strategy for the preparation of carbon quantum dot (CQD)- hybridized (nBu(4)N)(4)W10O32 (TBADT). A key step in this strategy is to hydrothermally treat CQD with TBABr solution to form the TBA(+) micelle-encapsulated CQD, which acts as a cationized hybridizer to combine with the W10O324- anion to yield the target catalyst. XPS, UV-vis, PL and CV characterizations indicated that CQD hybridizer plays unique roles in improving the structural stability, redox capacity and visible light response of TBADT, especially in enhancing the stability of its photo-excited state. In the visible light-triggered selective oxidation of cyclohexane, toluene, ethylbenzene and benzyl alcohol with dioxygens in acetonitrile, the optimized hybrid containing 3% CQD shows much higher photo-catalytic activity than pure TBADT, affording ca. 21.7% conversion and 84.8% cyclohexanone selectivity in cyclohexane photo-oxidation, Additionally, the additive 2 M HCl further enhances the above hybridization effects, thereby significantly promoting the current photo-catalytic oxidations.