In this study, Pd–Au/TiO₂–WO₃ nanoparticles were successfully prepared using a hydrothermal and sol-gel route and applied to the photoreduction of CO₂ under UV visible-light irradiation. The synthesized Pd–Au/TiO₂–WO₃ nanoparticles were characterized using X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett–Teller surface area measurement, ultraviolet–visible absorption spectrophotometry, and photoluminescence analysis. The experimental results showed that Pd–Au/TiO₂–WO₃ nanoparticles with the appropriate amounts of Pd and Au achieved the highest activity for CO₂ photoreduction. Among the synthesized Pd–Au/TiO₂-WO₃ nanoparticles, the highest production rates of CH₄ and CO, 39.1 μmol g⁻¹ h⁻¹ and 271.3 μmol g⁻¹ h⁻¹, respectively, were observed with 0.5 wt%Pd-0.1 wt%Au/TiO₂-WO₃, manifesting a significant 247-fold enhancement of CO yield over TiO₂. Moreover, 0.5 wt%Pd-0.1 wt%Au/TiO₂-WO₃ exhibited a 43-fold higher CH₄ production rate than did TiO₂ alone. This might be attributed to the increased specific surface area (72.9 m² g⁻¹) and the low recombination rate of photogenerated electron-hole pairs. Based on the results, a plausible mechanism for CO₂ photoreduction that uses synthesized Pd–Au/TiO₂–WO₃ is discussed in this paper. This study demonstrated that Pd–Au/TiO₂–WO₃ is a promising candidate for the development of an efficient photocatalyst for CO₂ photoreduction under solar light irradiation.

在这项研究中，成功地使用水热和溶胶-凝胶法制备了Pd–Au / TiO ₂ –WO ₃纳米颗粒，并将其应用于UV可见光照射下的CO ₂的光还原。使用X射线衍射，透射电子显微镜，X射线光电子能谱，Brunauer-Emmett-Teller表面积测量，紫外-可见吸收分光光度法和光致发光分析对合成的Pd-Au / TiO ₂ -WO ₃纳米粒子进行了表征。实验结果表明，适量的Pd和Au的Pd–Au / TiO ₂ –WO ₃纳米颗粒具有最高的CO ₂活性。光还原。在合成的Pd–Au / TiO ₂ -WO ₃纳米粒子中，CH ₄和CO的最高生产率分别为0.5 wt％，39.1μmolg ^-1  h ^-1和271.3μmolg ^-1  h ^-1。 Pd-0.1 wt％Au / TiO ₂ -WO ₃表现出CO产量比TiO ₂显着提高247倍。此外，与单独的TiO ₂相比，0.5wt％的Pd-0.1wt％的Au / TiO ₂ -WO ₃表现出高43倍的CH ₄生产率。这可能是由于比表面积增加（72.9 m ²g ^-1）和光生电子-空穴对的低复合率。根据结果​​，本文讨论了使用合成的Pd–Au / TiO ₂ –WO ₃进行CO _2光还原的合理机理。这项研究表明，Pd–Au / TiO ₂ –WO ₃是开发在太阳光照射下有效还原CO ₂的有效光催化剂的有希望的候选者。