Unique Layer‐Doping‐Induced Regulation of Charge Behavior in Metal‐Free Carbon Nitride Photoanodes for Enhanced Performance

ChemSusChem ◽  
2019 ◽  
Vol 13 (2) ◽  
pp. 328-333 ◽  
Author(s):  
Peng Luan ◽  
Qingqiang Meng ◽  
Jing Wu ◽  
Qinye Li ◽  
Xiaolong Zhang ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Free Carbon ◽  
Metal Free

FABRICATED METAL-FREE CARBON NITRIDE CHARACTERIZATIONS FOR FLUORESCENCE CHEMICAL SENSOR OF NITRATE IONS

2015 ◽  
Vol 76 (13) ◽  
Author(s):  
Nor Shuhada Alim ◽  
Hendrik O. Lintang ◽  
Leny Yuliati
Keyword(s):  
Carbon Nitride ◽  
Diffuse Reflectance ◽  
Chemical Sensor ◽  
Thermal Polymerization ◽  
Fluorescence Sensor ◽  
Free Carbon ◽  
Metal Free ◽  
Nitrate Ions ◽  
Relative Standard ◽  
First Time

In this study, a metal-free carbon nitride (CN) was investigated for the first time as a potential fluorescence sensor for detection of nitrate ions (NO3-). The CN was prepared through thermal polymerization of urea precursor at 823 K and characterized by diffuse reflectance ultraviolet-visible (DR UV-Vis), Fourier transform infrared (FTIR), and fluorescence spectroscopies. The DR UV-Vis spectrum confirmed that CN could absorb light up to 450 nm. On the other hand, the FTIR spectrum revealed the presence of graphitic CN single and double bond characters in the 800-1700 cm-1 region. From the fluorescence spectroscopy, three excitation peaks at 278, 310 and 369 nm were observed due to the presence of N=C, C=O and N-C groups, respectively. The fluorescence sensor capability of the CN was then investigated using concentrations of NO3- in the range of 300-1800 mM. It was confirmed that the intensities of the emission sites were quenched linearly with the concentrations of the NO3-. The CN showed good reproducibility with relative standard deviation (RSD) values were 1.5-7.2%.  These results suggested that CN can act as the fluorescence sensor for NO3-.

The special route toward conversion of methane to methanol on a fluffy metal‐free carbon nitride photocatalyst in the presence of H 2 O 2

2020 ◽  
Vol 44 (4) ◽  
pp. 2740-2753 ◽  
Author(s):  
Shangli Shi ◽  
Zhuxing Sun ◽  
Chenyu Bao ◽  
Tianshu Gao ◽  
Yun Hang Hu
Keyword(s):  
Carbon Nitride ◽  
Free Carbon ◽  
Metal Free ◽  
Conversion Of Methane

Metal-free carbon nitride photocatalysis with in situ hydrogen peroxide generation for the degradation of aromatic compounds

2019 ◽  
Vol 252 ◽  
pp. 128-137 ◽  
Author(s):  
André Torres-Pinto ◽  
Maria J. Sampaio ◽  
Cláudia G. Silva ◽  
Joaquim L. Faria ◽  
Adrián M.T. Silva
Keyword(s):  
Hydrogen Peroxide ◽  
Aromatic Compounds ◽  
Carbon Nitride ◽  
Free Carbon ◽  
Metal Free ◽  
Hydrogen Peroxide Generation

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.

Metal-free carbon nitride with boosting photo-redox ability realized by the controlled carbon dopants

2020 ◽  
Vol 382 ◽  
pp. 122657 ◽  
Author(s):  
Zhihao Li ◽  
Danlian Huang ◽  
Chengyun Zhou ◽  
Wenjing Xue ◽  
Lei Lei ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Free Carbon ◽  
Metal Free ◽  
Redox Ability

scholarly journals Design of p-n homojunctions in metal-free carbon nitride photocatalyst for overall water splitting

2021 ◽  
Vol 42 (3) ◽  
pp. 501-509 ◽  
Author(s):  
Gang Zhao ◽  
Shuhua Hao ◽  
Jinghua Guo ◽  
Yupeng Xing ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Carbon Nitride ◽  
Free Carbon ◽  
Metal Free ◽  
Overall Water Splitting

scholarly journals Efficient removal of parabens from real water matrices by a metal-free carbon nitride photocatalyst

2020 ◽  
Vol 716 ◽  
pp. 135346 ◽  
Author(s):  
Raquel A. Fernandes ◽  
Maria J. Sampaio ◽  
Goran Dražić ◽  
Joaquim L. Faria ◽  
Cláudia G. Silva
Keyword(s):  
Carbon Nitride ◽  
Free Carbon ◽  
Efficient Removal ◽  
Metal Free

Amoxicillin photodegradation under visible light catalyzed by metal-free carbon nitride: An investigation of the influence of the structural defects

2021 ◽  
Vol 401 ◽  
pp. 123713
Author(s):  
Ingrid F. Silva ◽  
Ivo F. Teixeira ◽  
Regiane D.F. Rios ◽  
Gustavo M. do Nascimento ◽  
Ildefonso Binatti ◽  
...  
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Free Carbon ◽  
Structural Defects ◽  
Metal Free

Efficiency and stability of metal-free carbon nitride in the photocatalytic ozonation of oxamic acid under visible light

2020 ◽  
Vol 8 (5) ◽  
pp. 104172
Author(s):  
Carla A. Orge ◽  
Maria J. Sampaio ◽  
Joaquim L. Faria ◽  
M. Fernando R. Pereira ◽  
Cláudia G. Silva
Keyword(s):  
Visible Light ◽  
Carbon Nitride ◽  
Free Carbon ◽  
Metal Free ◽  
Photocatalytic Ozonation
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