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Synthesis, Modification and Application of Photocatalytic Material Graphite Phase Carbon Nitride
Wenke YANG, Lianxue LU, Peng LI, Jian ZHANG, Shaozheng HU
Abstract781)   HTML28)    PDF (1744KB)(485)      

Graphite phase carbon nitride(g?C3N4), as an environmentally benign semiconductor material, has good application prospects in photocatalysis. However, the disadvantages of pure g?C3N4 such as small specific surface area and difficult separation of photogenerated carriers will limit its photocatalytic performance, which will restrict its large?scale application.From the synthetic methods and modification strategies, the research progress of g?C3N4 photocatalysts by researchers in recent years is reviewed, and the development of g?C3N4 photocatalysts in the fields of degradation of pollutants in water treatment, H2 and H2O2 production is summarised, and it can be found that the performance of the modified g?C3N4 photocatalysts has been greatly improved.Finally,the development direction of g?C3N4 photocatalyst is prospected.

2024, 37 (1): 43-51. DOI: 10.12422/j.issn.1006-396X.2024.01.006
Preparation,Modification,and Application of Graphitic Phase Carbon Nitride
Jipeng CHEN, Jiazi YANGYANG, Peng LI, Jian ZHANG, Shaozheng HU
Abstract1065)   HTML58)    PDF (1448KB)(768)      

As a classic non?metallic semiconductor photocatalyst, graphite phase carbon nitride material (g?C3N4) has attracted widespread attention in recent years due to its stable physical and chemical properties, reasonable band structure, low cost, easy availability, safety, and pollution?free advantages. It has good application and development prospects in the fields of environmental protection, purification and energy catalysis. However, the utilization of g?C3N4 in studies is significantly hampered by its tiny specific surface area, limited absorption of visible light, and high rate of recombination of photogenerated electrons and holes. The basic structure, characteristics and main modifications of g?C3N4 are reviewed, covering modification means such as elemental doping, morphological modulation, noble metal deposition and the practical applications of g?C3N4 in recent years at home and abroad.

2023, 36 (5): 45-51. DOI: 10.12422/j.issn.1006-396X.2023.05.006
Preparation of N⁃Containing Polymer Catalyst and Its Performance in Acetylene Hydrochlorination
Wenqiang Qiao, Xi Sun, Lianjie Wang, Jian Zhang, Yucai Qin, Lijuan Song
Abstract426)   HTML    PDF (1304KB)(155)      

A nitrogen?doped carbon catalyst was prepared by the calcination of the CN y precursor synthesized by the polymerization of paraformaldehyde,1,3,5?trimethylbenzene and p?phenylenediamine.This paper also investigated the effect of catalyst calcination temperature on the performance of acetylene hydrochlorination.The results indicate that CN y ?700?1 catalyst has the best reaction activity.It has an acetylene conversion of up to 89.8% under the optimized conditions of acetylene?to?hydrogen chloride volume ratio of 1.0∶1.1,reaction temperature of 280 ℃ and GHSV(C2H2) of 90 h-1.The catalyst characterization manifests that the activity of the catalyst is related to the specific surface area,pore volume,and pyrrole nitrogen content.The active site of the catalyst is the carbon atom bonding with the pyrrole nitrogen atom.Increasing the calcination temperature results in a larger specific surface area within a certain temperature range,and the pyridine nitrogen can also be converted to pyrrole nitrogen to a certain extent.The main cause of catalyst deactivation is carbon deposit.

2022, 35 (3): 30-35. DOI: 10.3969/j.issn.1006-396X.2022.03.005
Effects of Acetylacetone Ligand on Catalytic Performance of SnCl 2/AC in Acetylene Hydrochlorination
Wei Zhou, Jian Zhang, Wenqiang Qiao, Xi Sun, Yucai Qin, Lijuan Song
Abstract461)   HTML    PDF (1251KB)(112)      

Supported SnCl2 is a mercury?ree catalyst for acetylene hydrochlorination.5.0%Sn(acac)2Cl2/AC catalyst was prepared by introducing acetylacetone ligand to enhance the catalytic performance of SnCl2 in acetylene hydrochlorination.The results show that the acetylene conversion of 5.0%Sn(acac)2Cl2/AC catalyst is up to 96% under the conditions of acetylene?to?hydrogen chloride molar ratio of 1∶1.1,170 ℃ and GHSV(C2H2) of 90 h-1, which is higher than that of the 5.0%SnCl2/AC catalyst. The physical and chemical properties of the catalysts before and after the reaction also proved that the introduction of acetylacetone ligand can enhance the acetylene adsorption capacity of the SnCl2 catalyst and inhibit Sn loss during the reaction.Therefore,the activity and stability of the SnCl2 catalyst were effectively improved.

2022, 35 (2): 37-42. DOI: 10.3969/j.issn.1006-396X.2022.02.006
Research Progress of Graphite Phase Carbon Nitride Photocatalysts
Lei Xie, Shuai Liu, Youwei Sun, Jian Zhang, Shaozheng Hu
Abstract1541)   HTML    PDF (1056KB)(822)      

The photocatalysis technology becomes more and more mature. As a non?metallic visible light responsive catalyst, carbon nitride (g?C3N4) has attracted wide attention in the field of solar energy conversion and environmental protection due to its adjustable band gap structure, high physicochemical stability and environmental friendliness. It has become a new research hotspot. However, g?C3N4 also has some defects, such as small specific surface area, recombination of photogenerated electron and holes, and low utilization rate of light energy,which limit the application of g?C3N4 in practice.Therefore,the review focus on the development and research results of g?C3N4,and summarizes g?C3N4 from the aspects of development process,synthesis method, performance application,modification and optimization,and predicts how to further improve the performance of g?C3N4 to cope with the future development of the world.

2021, 34 (6): 27-34. DOI: 10.3969/j.issn.1006-396X.2021.06.005