Graphene/graphitic carbon nitride hybrids for catalysis

2017 ◽  
Vol 4 (5) ◽  
pp. 832-850 ◽  
Author(s):  
Qing Han ◽  
Nan Chen ◽  
Jing Zhang ◽  
Liangti Qu
Keyword(s):  
Mechanical Properties ◽  
Carbon Nitride ◽  
Electronic Band Structure ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Large Specific Surface Area ◽  
Thermal And Mechanical Properties ◽  
Electronic Band ◽  
Physicochemical Stability ◽  
Photochemical Catalysis

Benefiting from the large specific surface area, outstanding electronic, optical, thermal and mechanical properties of graphene, as well as the exceptional electronic band structure and good physicochemical stability of graphitic carbon nitride (g-C3N4), graphene/g-C3N4hybrids present great potential in electrochemical and photochemical catalysis.

scholarly journals Graphitic Carbon Nitride for Photocatalytic Air Treatment

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3038
Author(s):  
Michal Baudys ◽  
Šárka Paušová ◽  
Petr Praus ◽  
Vlasta Brezová ◽  
Dana Dvoranová ◽  
...  
Keyword(s):  
Uv Irradiation ◽  
Environmental Remediation ◽  
Carbon Nitride ◽  
Electronic Band Structure ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Paramagnetic Resonance ◽  
Electronic Band ◽  
Acetaldehyde Oxidation ◽  
Earth Abundant

Graphitic carbon nitride (g-C3N4) is a conjugated polymer, which recently drew a lot of attention as a metal-free and UV and visible light responsive photocatalyst in the field of solar energy conversion and environmental remediation. This is due to its appealing electronic band structure, high physicochemical stability and earth-abundant nature. In the present work, bulk g-C3N4 was synthesized by thermal decomposition of melamine. This material was further exfoliated by thermal treatment. S-doped samples were prepared from thiourea or further treatment of exfoliated g-C3N4 by mesylchloride. Synthesized materials were applied for photocatalytic removal of air pollutants (acetaldehyde and NOx) according to the ISO 22197 and ISO 22197-1 methodology. The efficiency of acetaldehyde removal under UV irradiation was negligible for all g-C3N4 samples. This can be explained by the fact that g-C3N4 under irradiation does not directly form hydroxyl radicals, which are the primary oxidation species in acetaldehyde oxidation. It was proved by electron paramagnetic resonance (EPR) spectroscopy that the dominant species formed on the irradiated surface of g-C3N4 was the superoxide radical. Its production was responsible for a very high NOx removal efficiency not only under UV irradiation (which was comparable with that of TiO2), but also under visible irradiation.

Improving the photocatalytic activity of s-triazine based graphitic carbon nitride through metal decoration: an ab initio investigation

2016 ◽  
Vol 18 (38) ◽  
pp. 26466-26474 ◽  
Author(s):  
K. Srinivasu ◽  
Brindaban Modak ◽  
Swapan K. Ghosh
Keyword(s):  
Photocatalytic Activity ◽  
Density Functional ◽  
Carbon Nitride ◽  
Electronic Band Structure ◽  
Density Functional Theory Calculations ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Electronic Band ◽  
Solar Water Splitting ◽  
Metal Decoration

Through density functional theory calculations, we attempted to tune the electronic band structure of poly s-triazine based graphitic carbon nitride by decorating it with different metal atoms and clusters for improving its photocatalytic activity towards solar water splitting.

scholarly journals Graphitic Carbon Nitride-Based Composite in Advanced Oxidation Processes for Aqueous Organic Pollutants Removal: A Review

Processes ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 66
Author(s):  
Yu Shen ◽  
Antonio J. Dos santos-Garcia ◽  
María José Martín de Vidales
Keyword(s):  
Organic Pollutants ◽  
Advanced Oxidation Processes ◽  
Carbon Nitride ◽  
Electronic Band Structure ◽  
Advanced Oxidation ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Electronic Band ◽  
Oxidation Processes ◽  
Pollutants Removal

In recent decades, a growing number of organic pollutants released have raised worldwide concern. Graphitic carbon nitride (g-C3N4) has drawn increasing attention in environmental pollutants removal thanks to its unique electronic band structure and excellent physicochemical stability. This paper reviews the recent progress of g-C3N4-based composites as catalysts in various advanced oxidation processes (AOPs), including chemical, photochemical, and electrochemical AOPs. Strategies for enhancing catalytic performance such as element-doping, nanostructure design, and heterojunction construction are summarized in detail. The catalytic degradation mechanisms are also discussed briefly.

Preparation of Nitrogen-Deficient Graphitic Carbon Nitride with a Large Specific Surface Area by Melt Pretreatment and Its Photocatalytic Performance

NANO ◽  
2020 ◽  
Vol 15 (06) ◽  
pp. 2050079
Author(s):  
Xuelei Li ◽  
Jinfeng Bai ◽  
Jiaqi Li ◽  
Chao Li ◽  
Junru Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Nitride ◽  
Mesoporous Structure ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Large Specific Surface Area ◽  
X Ray

In this study, nitrogen-deficient graphitic carbon nitride (M-LS-g-C3N4) with a mesoporous structure and a large specific surface area was obtained by calcination after melt pretreatment using urea as a precursor. X-ray diffraction (XRD), transmission electron microscopy (TEM), N2 adsorption, X-ray photoelectron spectroscopy (XPS), UV-Vis, ESR and photoluminescence (PL) were used to characterize the structure, morphology and optical performance of the samples. The TEM results showed the formation of a mesoporous structure on the 0.1[Formula: see text]M-LS-g-C3N4 surface. The porous structure led to an increase in the specific surface area from 41.5[Formula: see text]m2/g to 124.3[Formula: see text]m2/g. The UV-Vis results showed that nitrogen vacancies generated during the modification process reduced the band gap of g-C3N4 and improved the visible light absorption. The PL spectra showed that the nitrogen defects promoted the separation of photogenerated electron–hole pairs. In the visible light degradation of methyl orange (MO), the reaction rate constant of 0.1[Formula: see text]M-LS-g-C3N4 reached 0.0086[Formula: see text][Formula: see text], which was 5.05 times that of pure g-C3N4. Superoxide radicals and photogenerated holes were found to be the main active species in the reaction system. This study provides an efficient, green and convenient means of preparing graphitic carbon nitride with a large specific surface area.

scholarly journals A Contemporary Assessment on Composite Titania onto Graphitic Carbon Nitride-Based Catalyst as Photocatalyst

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Azami M. S. ◽  
Jalil A. A ◽  
Hitam C. N. C. ◽  
Mamat C. R ◽  
Siang T. J. ◽  
...  
Keyword(s):  
Band Gap ◽  
Carbon Nitride ◽  
Wide Band ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Electron Hole ◽  
Electronic Band ◽  
Metal Free ◽  
Physical And Chemical ◽  
Hole Recombination

Titanium dioxide (TiO2) has drawn widespread interest by researchers as a precious semiconductor that is responsive towards photodegradation of various pollutants. This catalyst has its own limitations such as fast electron-hole recombination, wide band gap, and can only be utilised under ultraviolet (UV) region. In order to overcome these problems, the addition of a metal-free dopant is a common practice to prevent electron-hole recombination and enhance photodegradation under visible light. Among various types of metal-free catalysts, carbon nitride material has received much attention due to its numerous benefits such as good in terms of physical and chemical strength, as well as an attractive electronic band combined with a band gap (2.7 eV). This review summarised recent works in the development of titania incorporated with graphitic carbon nitride (g-C3N4) for enhanced photocatalytic activity.

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