Synthesis of graphitic carbon nitride with large specific surface area via copolymerizing with nucleobases for photocatalytic hydrogen generation

2019 ◽  
Vol 463 ◽  
pp. 1-8 ◽  
Author(s):  
Yanyun Wang ◽  
Shuo Zhao ◽  
Yiwei Zhang ◽  
Wenxia Chen ◽  
Shenhao Yuan ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Nitride ◽  
Hydrogen Generation ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Large Specific Surface Area ◽  
Photocatalytic Hydrogen Generation

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 Synthesis of oxygen-doped graphitic carbon nitride and its application for the degradation of organic pollutants via dark Fenton-like reactions

RSC Advances ◽  
2020 ◽  
Vol 10 (54) ◽  
pp. 32906-32918 ◽  
Author(s):  
Tian-Jiao Jiang ◽  
Cai-Wu Luo ◽  
Chao Xie ◽  
Yue-Hua Wei ◽  
An Li
Keyword(s):  
Specific Surface ◽  
Environmental Protection ◽  
Surface Area ◽  
Organic Pollutants ◽  
Specific Surface Area ◽  
Active Sites ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride

Graphitic carbon nitride (g-C3N4) is a promising photocatalyst for environmental protection but its development is greatly limited for its application in dark Fenton-like reactions due to its extremely low specific surface area and lack of suitable active sites.

Protonation and microwave-assisted heating induced excitation of lone-pair electrons in graphitic carbon nitride for increased photocatalytic hydrogen generation

2019 ◽  
Vol 7 (35) ◽  
pp. 20223-20228 ◽  
Author(s):  
Dandan Wu ◽  
Shaonian Hu ◽  
Hongyun Xue ◽  
Xiaojuan Hou ◽  
Haiwei Du ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Hydrogen Generation ◽  
Lone Pair ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Microwave Assisted ◽  
Photocatalytic Hydrogen Generation ◽  
Lone Pairs ◽  
Lone Pair Electrons ◽  
Generation Activity

Graphitic carbon nitride (g-C3N4) with pronounced excitation of lone pairs enhances its photocatalytic hydrogen (H2) generation activity.

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