Photo-assisted simultaneous electrochemical detection of multiple heavy metal ions with a metal-free carbon black anchored graphitic carbon nitride sensor

2021 ◽  
pp. 338951
Author(s):  
Jiayue Hu ◽  
Zhi Li ◽  
Chuanyang Zhai ◽  
Lixi Zeng ◽  
Mingshan Zhu
2020 ◽  
Vol 167 (3) ◽  
pp. 037519 ◽  
Author(s):  
Rafiq Ahmad ◽  
Nirmalya Tripathy ◽  
Ajit Khosla ◽  
Marya Khan ◽  
Prabhash Mishra ◽  
...  

2018 ◽  
Vol 82 ◽  
pp. 99-105 ◽  
Author(s):  
Dimitra Das ◽  
Diptonil Banerjee ◽  
Nirmalya S. Das ◽  
Biswajit Das ◽  
Uttam K. Ghorai ◽  
...  

2020 ◽  
Vol 21 (3) ◽  
pp. 1052 ◽  
Author(s):  
Lilei Zhang ◽  
Jingxiao Zhang ◽  
Yuanyu Xia ◽  
Menghan Xun ◽  
Hong Chen ◽  
...  

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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