Abstract
The conversion of CO2 and H2O into hydrocarbon fuels using solar energy represents a promising approach to artificial photosynthesis. However, the rapid recombination of photogenerated carriers presents a significant obstacle to the development of this technology. In this study, we extracted carbon quantum dots (CQDs) from waste biomass sludge and utilized them as electron transfer mediators between ZnS and NH2−MIL-125(Ti) for CO2 photoreduction. Comparative analysis with single-phase and binary composites revealed that the ZnS/CQDs/NH2−MIL-125(Ti) composites exhibited heightened photocatalytic activity and improved photostability. Electrochemical and optical investigations further elucidated that the incorporation of CQDs enhanced the charge separation efficiency and visible light responsiveness of the composites. The yields of CH3OH and CH3CH2OH achieved were 501.57 µmol/g and 564.70 µmol/g, respectively, following 3 h of visible light irradiation. This study presents a novel reference for utilizing biomass to facilitate the conversion of CO2 and H2O into valuable chemicals.
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