scholarly journals Anatase TiO2-Decorated Graphitic Carbon Nitride for Photocatalytic Conversion of Carbon Dioxide

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 146 ◽  
Author(s):  
I-Hsiang Tseng ◽  
Yu-Min Sung ◽  
Po-Ya Chang ◽  
Chin-Yi Chen
Keyword(s):  
Surface Area ◽  
Carbon Nitride ◽  
Anatase Tio2 ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Hydroxyl Groups ◽  
Light Activity ◽  
Amine Groups ◽  
Porous Morphology

Three types of graphitic carbon nitride (gCN) nanosheets were derived from direct thermal condensation of urea, melamine, and dicyandiamide, respectively. As the sample (uCN) synthesized from urea exhibited porous morphology and highest surface area among other gCN, anatase TiO2 nanoparticles were then in-situ deposited on uCN via solvothermal process without further calcination. The resultant Ti/uCN_x samples remained with higher surface area and exhibited visible-light activity. The derived band structure of each sample also confirmed its ability to photoreduce CO2. XPS results revealed surface compositions of each sample. Those functional groups governed adsorption of reactant, interfacial interaction, electron transfer rate, and consequently influenced the yield of products. Carbon monoxide and methanol were detected from LED-lamp illuminated samples under appropriate moisture content. Samples with higher ratio of terminal amine groups produced more CO. The presence of hydroxyl groups promoted the initial conversion of methanol. The obtained Ti/uCN_0.5 and Ti/uCN_1.5 samples exhibited better quantum efficiency toward CO2 conversion and demonstrated stability to consistently produce CO under cycling photoreaction.

scholarly journals Band Engineering and Morphology Control of Oxygen-Incorporated Graphitic Carbon Nitride Porous Nanosheets for Highly Efficient Photocatalytic Hydrogen Evolution

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Yunyan Wu ◽  
Pan Xiong ◽  
Jianchun Wu ◽  
Zengliang Huang ◽  
Jingwen Sun ◽  
...  
Keyword(s):  
Surface Area ◽  
Hydrogen Evolution ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Physical Adsorption ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Photocatalytic Hydrogen Evolution ◽  
Band Engineering ◽  
Highly Efficient

AbstractGraphitic carbon nitride (g-C3N4)-based photocatalysts have shown great potential in the splitting of water. However, the intrinsic drawbacks of g-C3N4, such as low surface area, poor diffusion, and charge separation efficiency, remain as the bottleneck to achieve highly efficient hydrogen evolution. Here, a hollow oxygen-incorporated g-C3N4 nanosheet (OCN) with an improved surface area of 148.5 m2 g−1 is fabricated by the multiple thermal treatments under the N2/O2 atmosphere, wherein the C–O bonds are formed through two ways of physical adsorption and doping. The physical characterization and theoretical calculation indicate that the O-adsorption can promote the generation of defects, leading to the formation of hollow morphology, while the O-doping results in reduced band gap of g-C3N4. The optimized OCN shows an excellent photocatalytic hydrogen evolution activity of 3519.6 μmol g−1 h−1 for ~ 20 h, which is over four times higher than that of g-C3N4 (850.1 μmol g−1 h−1) and outperforms most of the reported g-C3N4 catalysts.

A simple tactic synthesis of hollow porous graphitic carbon nitride with significantly enriched photocatalytic performance

2021 ◽  
Author(s):  
Vellaichamy Balakumar ◽  
Manivannan Ramalingam ◽  
Chitiphon Chuaicham ◽  
KARTHIKEYAN SEKAR ◽  
K. Sasaki
Keyword(s):  
Crystal Structure ◽  
Surface Area ◽  
Carbon Nitride ◽  
Photocatalytic Performance ◽  
Porous Graphitic Carbon ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Modified Surface

Hollow porous graphitic carbon nitride (porous CN) was synthesized via a simple tactic method, and the resulting porous CN showed an effectively modified surface area, crystal structure and enhanced photocatalytic...

scholarly journals Synthesis of 3D porous MoS2/g-C3N4 heterojunction as a high efficiency photocatalyst for boosting H2 evolution activity

RSC Advances ◽  
2017 ◽  
Vol 7 (65) ◽  
pp. 40727-40733 ◽  
Author(s):  
Youzhi Cao ◽  
Qin Gao ◽  
Qiao Li ◽  
Xinbo Jing ◽  
Shufen Wang ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
High Efficiency ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
H2 Evolution ◽  
Novel Strategy ◽  
Porous Morphology

A novel strategy was applied for the preparation of MoS2/graphitic carbon nitride (g-C3N4) with porous morphology.

Carbon dioxide droplets stabilized by g-C3N4

2018 ◽  
Vol 20 (18) ◽  
pp. 4206-4209 ◽  
Author(s):  
Lifei Liu ◽  
Jianling Zhang ◽  
Bingxing Zhang ◽  
Jinbiao Shi ◽  
Xiuniang Tan ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride

Here we propose the emulsification of CO2 and water with graphitic carbon nitride (g-C3N4), in which the g-C3N4-stabilized CO2 droplets were utilized as “microreactors” for in situ photocatalytic CO2 reduction.

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