Application of Carbon Dots and Its Composites in the Field of Photocatalytic CO2 Reduction
The massive consumption of fossil fuels has caused the continuous increase of carbon dioxide concentration in the atmosphere,resulting in serious climate and environmental problems such as greenhouse effect and sea level rise.The use of solar photocatalysis to reduce CO2 to hydrocarbon fuel with added value is regarded as one of the most promising potential solutions.Researchers have developed a variety of photocatalysts,among which carbon dots are a new type of carbon nanomaterials with a size of less than 10 nm.They have unique up-conversion luminescence properties and can promote electron transfer.The synthesis method is friendly and safe.They are widely used in the field of photocatalytic reduction of CO2.In this paper,starting from the mechanism of photocatalytic reduction of CO2,the action mechanism and performance evaluation of carbon dots and carbon dot composite materials in photocatalytic reduction of CO2 are reviewed in detail in terms of light absorption efficiency,carrier separation efficiency,CO2 adsorption capacity and multiple interactions.The advantages of carbon dots in the field of photocatalytic reduction of CO2 are summarized.The existing challenges and possible ways to address the challenges in the future are analyzed.And the future development is prospected.It provides a new idea for promoting the development of carbon dot-based photocatalysts.
carbon dotscarbon dot compositesphotocatalysiscarbon dioxide reductionmechanism of photocatalytic CO2 reduction
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