Photocatalytic aerobic oxidation of hydrocarbons to ketones is an attractive route for synthesizing high-value-added chemicals. However, the main challenge of photocatalytic oxidation reactions is their low activity. Herein, hollow Bi₂MoO₆ microspheres were synthesized by a facile two-step synthesis route combining ethylene glycol solvothermal with postannealing treatment. In the photocatalytic aerobic oxidation of ethylbenzene to the corresponding ketones under visible light irradiation using O₂ as an oxidant, the hollow Bi₂MoO₆ microspheres exhibit a record acetophenone production rate of 1.1 mmol g^–1 h^–1 with 90% selectivity. The photoactivity of oxygen vacancy-enriched Bi₂MoO₆ is 61 times higher than that of uncalcined Bi₂MoO₆, which can be attributed to the effective separation of photogenerated carriers and the abundant catalytic active sites (i.e., oxygen vacancies) on hollow Bi₂MoO₆ microspheres. This work provides more insights into understanding how to construct highly efficient and active visible-light-responsive photocatalysts for the aerobic oxidation of organic compounds.

中文翻译：

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富含氧空位的 Bi2MoO6 中空微球用于碳氢化合物的高效光催化氧化

碳氢化合物光催化有氧氧化为酮是合成高附加值化学品的一条有吸引力的途径。然而，光催化氧化反应的主要挑战是其活性低。在此，通过乙二醇溶剂热与后退火处理相结合的简便的两步合成路线合成了空心Bi ₂ MoO ₆微球。在可见光照射下，使用O ₂作为氧化剂，乙苯光催化有氧氧化成相应的酮，空心Bi ₂ MoO _{6微球表现出创纪录的1.1 mmol g} ^–1 h ^–1苯乙酮产率，选择性为90%。富氧空位的Bi ₂ MoO ₆的光活性比未煅烧的Bi ₂ MoO ₆高61倍，这归因于光生载流子的有效分离以及空心Bi上丰富的催化活性位点（即氧空位）₂ MoO ₆微球。这项工作为理解如何构建用于有机化合物有氧氧化的高效、活性可见光响应光催化剂提供了更多见解。