This
paper discloses a simple and productive hybridizing engineering
(HE) strategy for the 3d transition-metal-ion (M
n+ = Fe3+, Fe2+, Co2+, Ni2+)-doped (nBu4N)4W10O32 (M
n+-TBADT) compounds
as highly efficient visible-light catalysts. Ultraviolet visible (UV–vis),
Fourier transform infrared (FT-IR) and photoluminescence (PL) spectra,
and cyclic voltammetry (CV) characterizations indicate that the synthetic
quality, redox capacity, and visible light harvesting efficiency of
TBADT, especially the separation efficiency of its photogenerated
electron–hole pairs, are regulated by the metal ion dopants
and gradually improved with a change of the dopant from Fe3+, Fe2+, and Co2+ to Ni2+, along
with a continuous and significant enhancement of its photocatalytic
efficiency in the visible-light-triggered selective oxidation of ethylbenzene
with dioxygens in acetonitrile. The best 0.5 mol % Ni2+-doped TBADT can achieve a ca. 55% conversion under optimal reaction
conditions and also exhibits much higher photocatalytic activity for
the photo-oxidation of toluene, cyclohexane, and benzyl alcohol compared
to pure TBADT. This HE strategy showcases great potential in improving
the photocatalysis performance of TBADT.
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