Carbon dioxide conversion into valuable industrial products like methanol has gained plenty of attention in recent years. The photocatalytic CO₂ reduction is one of the strategies most studied as it is cleaner and has the potential to be more convenient to classical thermochemistry. In this paper, pristine ZIF-8 was decorated with ZnO, Pt, Cu and Au nanoparticles (NPs) to achieve four novel photocatalysts denoted ZnO/ZIF-8, Pt/ZIF-8, Au/ZIF-8, and Cu/ZIF-8 for CO₂ reduction to methanol under ultraviolet/visible (UV/Vis) light irradiation at room temperature. All synthesized photocatalysts were fully characterized by XRD, FT-IR, FESEM, TEM, N₂ adsorption-desorption, EDS, PL spectroscopy and DRS. DRS revealed successful reduction of the Eg of ZIF-8 up to 71 % after its decoration with NPs. In addition, PL analysis confirmed the efficient hindering of recombination of photoinduced electron-hole pairs in all modified samples. ZnO/ZIF-8 photocatalyst’s features the oxygen vacancies in ZnO NPs, the permanent generation of electron-hole pairs, and an efficient charge-carrier separation due to formation of type II heterojunctions demonstrated higher methanol yield compared to metal NP-impregnated ZIF-8. Interestingly, among metal NPs, Pt/ZIF-8 sample unveiled higher activity toward CO₂ photoreduction due to its higher ability to light trapping and higher surface area providing more efficacious interaction of CO₂ with the photocatalyst. Moreover, the obtained results demonstrated that methanol production rate over ZnO/ZIF-8 and Pt/ZIF-8 samples can reach 6700 and 5300 μmol.g⁻¹ after 1 h exposure under UV/Vis irradiation, respectively.

近年来，二氧化碳转化为有价值的工业产品（如甲醇）已引起了广泛关注。光催化CO ₂还原是最受研究的策略之一，因为它更清洁，并且有可能更适合经典的热化学方法。本文用ZnO，Pt，Cu和Au纳米颗粒（NPs）修饰了原始的ZIF-8，以实现四种新型光催化剂，分别为ZnO / ZIF-8，Pt / ZIF-8，Au / ZIF-8和Cu / ZIF -8用于在室温下在紫外线/可见光（UV / Vis）照射下将CO ₂还原为甲醇。通过XRD，FT-IR，FESEM，TEM，N ₂吸附-脱附，EDS，PL光谱和DRS对所有合成的光催化剂进行了全面表征。DRS显示成功降低了Eg使用NP进行装饰后，ZIF-8的比例高达71％。此外，PL分析证实了所有修饰样品中光诱导电子-空穴对重组的有效阻碍。ZnO / ZIF-8光催化剂具有ZnO NP中的氧空位，永久生成电子-空穴对以及由于形成II型异质结而导致的有效电荷-载流子分离，与金属NP浸渍的ZIF-8相比具有更高的甲醇收率。 。有趣的是，在金属NP中，Pt / ZIF-8样品具有更高的捕获光的能力和更大的表面积，从而提供了更有效的CO ₂相互作用，因此具有更高的CO _2光还原活性。与光催化剂。此外，获得的结果表明，在UV / Vis照射下暴露1h后，ZnO / ZIF-8和Pt / ZIF-8样品上的甲醇生产率分别可以达到6700和5300μmol.g ^- 1。