Photocatalytic selective oxidation of HMF to DFF based on hollow CdS QDs/MIL-101 composites under visible light

• Published in: Molecular catalysis 2024-12, Vol.569, p.114632, Article 114632
• Main Authors: Liang, Yuwei, Hu, Chunling, Chen, Peng, Li, Qi, Wu, Jianning, Liu, Zhiyong, Liu, Jichang, Tai, Yanlong
• Format: Article
• Language: English
• Subjects: CdS QDs; HMF; MIL-101(Cr); Oxiditionl; Photocatalytic
• ISSN: 2468-8231; 2468-8231
• DOI: 10.1016/j.mcat.2024.114632

•Hollow CdS quantum dots interact with MIL-101 to accelerate ·O2- generation.•70 % CdS QDs/MIL-101 exhibits the best performance in photocatalytic oxidation of HMF to DFF.•The process of photocatalytic HMF oxidation was explored.•The photocatalytic mechanism of CdS QDs/MIL-101 for the conversion of HMF to DFF is proposed. 5-hydroxymethylfurfural (HMF) can catalyte into 2,5-diformylfuran (DFF) which had received much attention as a potential biomass resource. Here, we used a simple and effective method to construct hollow CdS quantum dot (CdS QDs)/MIL-101 heterostructures with high contact area and multiple active sites. The structure of heterostructures could improve photocatalytic activity by charge transfer, photogenerated carrier separation and the multiple refractions of light supported within the hollow-structured CdS QDs. The detailed catalytic mechanism was illustrated by trap agent experiments and electron paramagnetic resonance (EPR) spectroscopy, in which superoxide radicals (·O2-) play a decisive role in the catalytic oxidation of HMF to DFF. Furthermore, the large specific surface area of MIL-101 adsorbs O2 from the reaction system thereby accelerating the ·O2- formation process. Under environmental conditions, 70 % CdS QDs/MIL-101 exhibited optimal catalytic performance. Comparing with pure CdS QDs, the photocurrent enhances 1.8 times, HMF conversion is 1.5 times and DFF selectivity is 1.2 times. This work provide a useful way to improve the conversion of biomass by Z-heterostructures under ambient conditions. Oxidation of 5-hydroxymethylfurfural to 2,5-dicarbonylfuran catalysed by CdS QDs/MIL- [Display omitted]