As a promising semiconductor photocatalyst with visible light response,graphite phase carbon nitride (g-C3N4) has great potential in solving energy and pollution issues.Unfortunately,the disadvantage,such as small specific surface area and high recombination rate of electron-hole generated during the photocatalysis,limit its practical application.Herein,to improve the photocatalysis performance,a series of g-C3N4 with various special morphology were synthesized.Through the supramolecular self-assembly method combined with one-step calcination process,the morphology of g-C3N4 can be controlled by changing the proportion of precursor.It was found that the specific surface area of the bottle-like g-C3N4 was increased,the recombination of photogenerated carriers was modified and the optimized band structure improved REDOX capacity.The methylene blue (MB) simulated wastewater was employed to evaluate the photocatalytic activity of a series of g-C3N4 with special morphology.Compared with that of traditional bulk g-C3N4,the photocatalytic degradation efficiency of bottle-like g-C3N4 was improved from 11.7% to 97.1%.Meanwhile,and the photocatalytic degradation rate constant of bottle-like g-C3N4 increased 12.3 times than that of bulk g-C3N4.This work provided green and efficient morphology modification method of g-C3N4,which had a certain reference value for the improvement and optimization of g-C3N4 and practical application.
[1] Fujishima A,Honda K.Electrochemical photolysis of water at a semiconductor electrode[J].Nature,1972,238(5358):37-38.
[2] Roy P,Kim D,Lee K,et al.TiO2 nanotubes and their application in dye-sensitized solar cells[J].Nanoscale,2010,2(1):45-59.
[3] Wang X C,Maeda K,Thomas A,et al.A metal-free polymeric photocatalyst for hydrogen production from water under visible light[J].Nat Mater,2009,8(1):76-80.
[4] Cui Y J,Zhang J S,Zhang G G,et al.Synthesis of bulk and nanoporous carbon nitride polymers from ammonium thiocyanate for photocatalytic hydrogen evolution[J].Journal of Materials Chemistry,2011,21(34):13032-13039.
[5] He F,Zhu B C,Cheng B,et al.2D/2D/0D TiO2/C3N4/Ti3C2 MXene composite S-scheme photocatalyst with enhanced CO2 reduction activity[J].Applied Catalysis B-Environmental,2020,272:16227-16235.
[6] Tang M L,Ao Y H,Wang C,et al.Facile synthesis of dual Z-scheme g-C3N4/Ag3PO4/AgI composite photocatalysts with enhanced performance for the degradation of a typical neonicotinoid pesticide[J].Applied Catalysis B:Environmental,2020,268:15988-15995.
[7] Li K L,He Y,Chen P,et al.Theoretical design and experimental investigation on highly selective Pd particles decorated C3N4 for safe photocatalytic NO purification[J].Journal of Hazardous Materials,2020,392:467-173.
[8] 丁同悦,陈奕桦,胡俊俊,等.溴氧化铋/石墨氮化碳复合半导体制备及其可见光催化性能研究[J].化工新型材料,2020,48(7):206-209.
[9] Han X,An L,Hu Y,et al.Ti3C2 MXene-derived carbon-doped TiO2 coupled with g-C3N4 as the visible-light photocatalysts for photocatalytic H2 generation[J].Applied Catalysis B:Environmental,2020,265:10510-10516.
[10] Guo H,Niu C G,Feng C Y,et al.Steering exciton dissociation and charge migration in green synthetic oxygen-substituted ultrathin porous graphitic carbon nitride for boosted photocatalytic reactive oxygen species generation[J].Chemical Engineering Journal,2020,385:20164-20172.
[11] 马元功,魏定邦,赵静卓,等.磷掺杂石墨相氮化碳及其光催化性能研究[J].化工新型材料,2020,48(4):196-201.
[12] 孙少峰,涂琴,张丽.CeO2/g-C3N4复合光催化剂的制备及其光催化性能研究[J].水处理技术,2021,47(4):52-55.
[13] Wang W,Shu Z,Zhou J,et al.Halloysite-derived mesoporous g-C3N4 nanotubes for improved visible-light photocatalytic hydrogen evolution[J].Applied Clay Science,2018,158:143-149.
[14] Li D F,Huang W Q,Zou L R,et al.Mesoporous g-C3N4 Nanosheets:synthesis,superior adsorption capacity and photocatalytic activity[J].J Nanosci Nanotechnol,2018,18(8):5502-5510.
[15] Song Z,Lin T,Lin L,et al.Invisible security ink based on water-soluble graphitic carbon nitride quantum dots[J].Angew Chem Int Ed Engl,2016,55(8):2773-2777.
基金资助
国家自然基金(21676060);广东省自然科学基金项目——Pd基催化剂化学环境调控及其对甲酸分解制氢性能的影响(2021A1515010078)
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