Abstract Strontium titanate nanocube-dispersed mesoporous silica (STO(NC)-MPS) nanocomposite was examined as a photocatalyst for the photoreduction of CO2. Copper (Cu) was examined as a co-catalyst, and the results showed that it was effective for the production of CO under a flow of CO2 and UV irradiation in water. As confirmed by gas chromatography–mass spectrometry, 13CO was produced in the presence of 13CO2, thus demonstrating that CO was generated upon photoreduction of CO2. Simultaneous formation of O2 suggested that water acted as a reductant in the photocatalysis process. Moreover, Cu supported on STO(NC)-MPS showed higher selectivity toward CO2 reduction when compared with Cu-supported composite prepared from mesoporous silica and SrTiO3 that was synthesized by conventional solid state reaction. Thus, the current findings highlight the characteristics and advantages of SrTiO3 nanocubes and their nanocomposites with mesoporous silica as photocatalysts for CO2 photoreduction.

中文翻译：

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钛酸锶纳米立方体分散介孔二氧化硅光催化还原二氧化碳

摘要 钛酸锶纳米立方体分散的介孔二氧化硅 (STO(NC)-MPS) 纳米复合材料作为光催化剂用于光还原 CO2 进行了研究。铜 (Cu) 作为助催化剂进行了研究，结果表明它在 CO2 流和水中紫外线照射下可有效产生 CO。气相色谱-质谱法证实，13CO 是在 13CO2 存在下产生的，因此证明 CO2 光还原时产生了 CO。O2 的同时形成表明水在光催化过程中起到了还原剂的作用。此外，与通过常规固态反应合成的介孔二氧化硅和 SrTiO3 制备的 Cu 负载复合材料相比，STO(NC)-MPS 负载的 Cu 显示出更高的 CO2 还原选择性。因此，