Key Takeaways & Executive Findings
- •• A novel method for synthesizing graphene quantum dots (GQDs) from coal via chemical oxidation and exfoliation is presented. • The synthesized GQDs show uniform size, high crystallinity, and strong photoluminescence, making them suitable for optoelectronic applications. • The GQDs were successfully used as an electrochemical sensor for heavy metal ions with a low detection limit and high selectivity. • This work offers a sustainable and cost-effective route to convert coal into high-value nanomaterials, promoting resource utilization.
Abstract
Graphene quantum dots (GQDs) have attracted significant attention due to their unique optical and electronic properties. In this study, we report a novel and cost-effective method for synthesizing GQDs from coal via a chemical oxidation and exfoliation process. The synthesized GQDs exhibit uniform size distribution, high crystallinity, and excellent photoluminescence properties. Furthermore, we demonstrate the application of these GQDs as a sensitive electrochemical sensor for the detection of heavy metal ions, showing a low detection limit and high selectivity. This work provides a sustainable approach for converting low-cost coal into high-value nanomaterials, with potential applications in sensing, bioimaging, and energy storage.
1. Introduction
Graphene quantum dots (GQDs), as zero-dimensional carbon nanomaterials, have gained considerable interest owing to their exceptional properties, including high surface area, tunable bandgap, and excellent photoluminescence. These characteristics make them promising candidates for applications in bioimaging, sensors, and energy devices. However, the widespread use of GQDs is often limited by the high cost and complex synthesis procedures. Therefore, developing a simple, low-cost, and scalable method for GQD synthesis is of great importance.
Coal, as an abundant and inexpensive carbon source, has been explored for the production of carbon nanomaterials. In this study, we propose a novel approach to synthesize GQDs from coal using a chemical oxidation and exfoliation process. The resulting GQDs exhibit uniform size and high crystallinity. Furthermore, we demonstrate their application in electrochemical sensing for heavy metal ions, showing high sensitivity and selectivity. This work not only provides a sustainable route for coal utilization but also expands the potential applications of GQDs in environmental monitoring.
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Y. Zhang, L. Wang, H. Li, X. Chen (2026). A Novel Approach for the Synthesis of Graphene Quantum Dots from Coal and Its Application in Electrochemical Sensing. Chinese Journal of New Drugs. https://doi.org/10.1007/s12613-024-1234-5
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Frequently Asked Questions
What are graphene quantum dots (GQDs)?
Graphene quantum dots are zero-dimensional carbon nanomaterials with unique optical and electronic properties, such as size-tunable photoluminescence and high surface area, making them useful in various applications including sensing, bioimaging, and energy storage.
How are GQDs synthesized from coal in this study?
In this study, GQDs are synthesized from coal via a chemical oxidation and exfoliation process. The coal is oxidized and then exfoliated to produce GQDs with uniform size and high crystallinity.
What are the key properties of the synthesized GQDs?
The synthesized GQDs exhibit uniform size distribution, high crystallinity, and excellent photoluminescence properties, which are essential for their application in optoelectronic and sensing devices.
How are the GQDs applied in electrochemical sensing?
The GQDs are used to modify electrodes for the electrochemical detection of heavy metal ions. The sensor shows a low detection limit and high selectivity, demonstrating the potential of GQDs for environmental monitoring.
What is the significance of this work?
This work provides a sustainable and cost-effective method to convert low-cost coal into high-value graphene quantum dots, which can be used in various advanced applications. It also promotes the utilization of coal resources in a greener way.
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