Gold supported on Bi2MoO6 based on oxygen vacancy structure: Enhanced adsorption activation for efficient photocatalytic selective oxidation of benzyl alcohol
Source abstract
Abstract
In this work, ethylene glycol was used as a mild reducing agent to prepare Bi 2MoO 6 support with oxygen vacancies. By introducing Au active species, an Au/BMO-Ov (Bi 2MoO 6 support with oxygen vacancies) photocatalyst was synthesized, which was co-modified with oxygen vacancies and Au NPs (nanoparticles), and significantly improved the capability of Bi 2MoO 6 for visible light-driven BA (benzyl alcohol) conversion. The 1 wt% Au/BMO-Ov exhibited the highest conversion (98.8 %) of BA and excellent selectivity (97.4 %) of BAD (benzaldehyde) under visible light. Oxygen vacancies have an inhibitory effect on the recombination of photogenerated carriers. Au NPs acted as both photosensitizers (LSPR effect captures light and generates electrons and holes) and active species (used as Lewis acids). The results of photoelectrochemistry (PEC) tests confirmed that the synergistic interaction of Au and oxygen vacancies enhanced the photoactivity of bismuth molybdate. Meanwhile, density functional theory (DFT) calculations indicated that oxygen vacancies and Au synergistically reduced the bandgap energy of Bi 2MoO 6 and enhanced the adsorption of BA. Au served as the Lewis acid site for adsorption of BA, and improved the reactivity of light-driven BA conversion. The corresponding mechanism was proposed based on the experimental results and DFT calculations.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Catalytic Processes in Materials Science · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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