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Graphitic carbon nitride with thermally-induced nitrogen defects: an efficient process to enhance photocatalytic H₂ production performance.

ABSTRACT: Graphitic carbon nitride (g-C₃N₄, CN) with nitrogen vacancies was synthesized by a controlled thermal etching method in a semi-closed air-conditioning system. The defect-modified g-C₃N₄ shows an excellent photocatalytic performance demonstrated by water splitting under visible light irradiation. With proper heat-treatment durations such as 2 h (CN2) and 4 h (CN4) at 550 °C, the hydrogen production rates significantly increase to 100 μmol h^-1 and 72 μmol h^-1, which are 11 times and 8 times the rate of the pristine CN (8.8 μmol h^-1) respectively. The excellent hydrogen production performance of nitrogen defect modified CN2 is due to the synergy effect of the decreased band gap, enlarged specific surface area and increased separation/migration efficiency of photoinduced charge carriers. This simple defect engineering method provides a good paradigm to improve the photocatalytic performance by tailoring the electronic and physical structures of g-C₃N₄.

SUBMITTER: Dong G

PROVIDER: S-EPMC9053999 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Graphitic carbon nitride with thermally-induced nitrogen defects: an efficient process to enhance photocatalytic H2 production performance.

Dong Guangzhi G Wen Yun Y Fan Huiqing H Wang Chao C Cheng Zhenxiang Z Zhang Mingchang M Ma Jiangwei J Zhang Shujun S

RSC advances 20200515 32

Graphitic carbon nitride (g-C3N4, CN) with nitrogen vacancies was synthesized by a controlled thermal etching method in a semi-closed air-conditioning system. The defect-modified g-C3N4 shows an excellent photocatalytic performance demonstrated by water splitting under visible light irradiation. With proper heat-treatment durations such as 2 h (CN2) and 4 h (CN4) at 550 °C, the hydrogen production rates significantly increase to 100 μmol h-1 ...[more]

PMID: 35518330

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Project description:Highlights • Nitrogen-defective porous ultrathin g-C3N4 nanosheets (DUCN) were prepared.• DUCN exhibited high photocatalytic inactivation performance toward E. coli and B. subtilis.• Ultrathin nanosheets structure enhanced the interaction between photocatalysts and bacteria.• Nitrogen defects reduced charge recombination and improved H2O2 generation.• Good stability in consecutive photocatalytic inactivation experiments. The efficient generation and utilization of ROSs is a key step in determining the achievement of safe drinking water by photocatalytic bacterial inactivation technology. Although graphitic carbon nitride (g-C3N4) serves as a green and promising photocatalyst for water disinfection, insufficient bacterial capturing capacity and serious charge recombination of pristine g-C3N4 extremely restrict its bactericidal activity. Herein, we develop a facile thermal exfoliation and thermal polymerization method to prepare the nitrogen-defective ultrathin g-C3N4 nanosheets (DUCN-500). Our results showed that ultrathin nanosheet structure greatly enhanced bacterial capturing capacity of g-C3N4 to increase the utilization efficiency of ROS, which contributed to the performance of DUCN-500 greatly outperforming bulk g-C3N4. The nitrogen defects increased ROS generation (·O2− and H2O2) by approximately 4.6 times, which was attributed to negative shift of the conduction band potential and rapid separation of charge carriers. The DUCN-500 could rapidly and completely inactivate Escherichia coli and Bacillus subtilis in real sewage under simulated solar irradiation, accompanied by good anti-interference capability and stability. Additionally, bacterial morphology destruction, the loss of antioxidant enzyme activity and the leakage of protein were proven to be the main mechanisms of photocatalytic sterilization. This study offers new insight into the rational design of efficient g-C3N4-based photocatalysts for water disinfection. Graphical abstract Image, graphical abstract

Dataset Information

Graphitic carbon nitride with thermally-induced nitrogen defects: an efficient process to enhance photocatalytic H₂ production performance.

Publications

Graphitic carbon nitride with thermally-induced nitrogen defects: an efficient process to enhance photocatalytic H<sub>2</sub> production performance.

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