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Published on: July 11, 2012
High-Quantum-Yield Carbon Nitride Quantum Dots via Water Vapor Intercalation-Exfoliation for Efficient Tetracycline
Wanlong Song1, Niuniu Zhang1, Jianing Li2
1College of Light Industry Science and Engineering, Tianjin University of Science and Technology, Tianjin, 300457, P. R. China.
Abstract:
Graphitic carbon nitride (g-C3N4) has demonstrated potential applications in addressing energy shortages and preserving water ecosystem stability due to its high efficiency in degrading antibiotics. However, the mediocre catalytic performance of bulk g-C3N4 is attributed to inefficient carrier transport and a high complexation rate of photogenerated electron-hole pairs. Herein, a method for fabricating carbon nitride quantum dots (CNQDs) via water vapor intercalation-exfoliation during high-temperature thermo-polymerization of g-C3N4 is proposed. The resulting CNQDs exhibit a high quantum yield (49.8%), reduced bandgap, and pH-dependent properties. Structural nitrogen defects and doping of oxygen-containing functional groups contribute to improved charge-transfer efficiency and enhanced photooxidation capacity of CNQDs from water vapor intercalation-exfoliation. Remarkably, the optimal CNQDs-650 demonstrates excellent photodegradation activity of tetracycline hydrochloride (TCH), ≈2.7 times higher than that of g-C3N4. Additionally, the photo degradation pathways of TCH are proposed based on identified intermediates. This study introduces a new and efficient approach to synthesizing CNQDs with high photocatalytic performance.
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