Engineering highly graphitic carbon quantum dots by catalytic dehydrogenation and carbonization of Ti3C2Tx-MXene wrapped polystyrene spheres

Carbon ◽  
2022 ◽  
Author(s):  
Hao-Ran Chen ◽  
Wei-Ming Meng ◽  
Ri-Yuan Wang ◽  
Fang-Lin Chen ◽  
Tao Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Graphitic Carbon ◽  
Catalytic Dehydrogenation ◽  
Polystyrene Spheres

Graphitic carbon quantum dots as a fluorescent sensing platform for highly efficient detection of Fe3+ ions

RSC Advances ◽  
2013 ◽  
Vol 3 (11) ◽  
pp. 3733 ◽  
Author(s):  
Yong-Lai Zhang ◽  
Lei Wang ◽  
Heng-Chao Zhang ◽  
Yang Liu ◽  
Hai-Yu Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Quantum Dots ◽  
Graphitic Carbon ◽  
Fluorescent Sensing ◽  
Highly Efficient ◽  
Efficient Detection ◽  
Sensing Platform

scholarly journals Metal-Free Carbon Quantum Dots Implant Graphitic Carbon Nitride: Enhanced Photocatalytic Dye Wastewater Purification with Simultaneous Hydrogen Production

2020 ◽  
Vol 21 (3) ◽  
pp. 1052 ◽  
Author(s):  
Lilei Zhang ◽  
Jingxiao Zhang ◽  
Yuanyu Xia ◽  
Menghan Xun ◽  
Hong Chen ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Hydrogen Production ◽  
Carbon Nitride ◽  
Carbon Quantum Dots ◽  
Free Carbon ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Dye Wastewater ◽  
Wastewater Purification ◽  
Metal Free

The use of photocatalysts to purify wastewater and simultaneously convert solar energy into clean hydrogen energy is of considerable significance in environmental science. However, it is still a challenge due to their relatively high costs, low efficiencies, and poor stabilities. In this study, a metal-free carbon quantum dots (CQDs) modified graphitic carbon nitride photocatalyst (CCN) was synthesized by a facile method. The characterization and theoretical calculation results reveal that the incorporation of CQDs into the g-C3N4 matrix significantly improves the charge transfer and separation efficiency, exhibits a redshift of absorption edge, narrows the bandgap, and prevents the recombination of photoexcited carriers. The hydrogen production and simultaneous degradation of methylene blue (MB) or rhodamine B (RhB) in simulated wastewaters were further tested. In the simulated wastewater, the CCN catalyst showed enhanced photodegradation efficiency, accompanied with the increased hydrogen evolution rate (1291 µmol·h−1·g−1). The internal electrical field between the g-C3N4 and the CQDs is the main reason for the spatial separation of photoexcited electron-hole pairs. Overall, this work could offer a new protocol for the design of highly efficient photocatalysts for dye wastewater purification with simultaneous hydrogen production.

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