Seeharaj Panpailin, Vittayakorn Naratip, Morris John, Kim-Lohsoontorn Pattaraporn
Advanced Materials Research Unit, Department of Chemistry, Faculty of Science, King Mongkut's Institute of Technology Ladkrabang, 10520 Ladkrabang, Bangkok, Thailand.
KRIS Research and Innovation Services, King Mongkut's Institute of Technology Ladkrabang, 10520 Ladkrabang, Bangkok, Thailand.
Nanotechnology. 2021 Jun 24;32(37). doi: 10.1088/1361-6528/ac08be.
An attempt to reduce COemissions has led to the development of CeO/CuO/TiOheterojunction photocatalysts for photoconversion of COto useful products, e.g. ethanol. Composite photocatalysts were simply prepared by mixing TiO(P25) with different mass ratios of CeO(1 wt%) and CuO (2 or 3 wt%) by ball milling. The prepared photocatalysts had uniformly distributed CeOand CuO phases, throughout the TiOphase. The integration of CeOand CuO into TiOat 1 wt% CeOand 3 wt% CuO produced a composite, with a reduced band gap of 2.88 eV, allowing absorption of lower energy light and a lower electron-hole recombination rate. The 1%CeO/3%CuO/TiOphotocatalysts yielded ethanol at 30.5mol gh, almost three times higher than the yield from pure TiO. This improved COconversion efficiency was due to contributions from properties of both additives: CeOincreased light absorption, while CuO acted as an electron trap and enhanced COadsorption. In addition, the heterojunction at the interfaces facilitated the photogenerated charge separation, which, in turn, increased the charge participation in the catalyzed conversion reactions.
为了减少二氧化碳排放，人们开发了氧化铈/氧化铜/二氧化钛异质结光催化剂，用于将二氧化碳光催化转化为有用的产物，例如乙醇。通过球磨将二氧化钛（P25）与不同质量比的氧化铈（1 wt%）和氧化铜（2 wt%或3 wt%）简单混合，制备了复合光催化剂。所制备的光催化剂中，氧化铈和氧化铜相在整个二氧化钛相中均匀分布。在1 wt%氧化铈和3 wt%氧化铜的条件下，将氧化铈和氧化铜整合到二氧化钛中，得到了一种复合光催化剂，其带隙减小至2.88 eV，能够吸收能量较低的光，且电子-空穴复合率降低。1%氧化铈/3%氧化铜/二氧化钛光催化剂的乙醇产率为30.5 μmol g⁻¹ h⁻¹，几乎是纯二氧化钛产率的三倍。这种提高的二氧化碳转化效率归因于两种添加剂的特性：氧化铈增加了光吸收，而氧化铜作为电子陷阱增强了二氧化碳吸附。此外，界面处的异质结促进了光生电荷分离，进而增加了电荷参与催化转化反应的程度。
