Abstract
Constructing heterojunction between two semiconductors with matched energy band structure is an ef-fective modification method to obtain excellent photocatalysts.The experimental scheme adopts a simple solvent method to self-assemble nitrogen doped carbon dots(N-CDs)on the surface of sulfur doped car-bon nitride(S-C3N4)semiconductor through π-π conjugate interaction.Based on this,a novel 0D/2D S-scheme heterojunction N-CDs/S-C3N4 hybrid was successfully prepared.The degradation kinetic constants of N-CDs/S-C3N4 for rhodamine B(RhB)and p-nitrophenol(PNP)reached 0.23522 and 0.01342 min-1,re-spectively,which were 2.72 and 2.65 times that of S-C3N4.The highest photocatalytic hydrogen evolution rate was observed under the simulated sunlight irradiation,which was 2.30 times that of S-C3N4.The improvement of photocatalytic performance was mainly based on the formation of the S-scheme hetero-junction between S-C3N4 and N-CDs.The effects of internal electric field,π-π conjugate interaction and band bending promoted the photogenerated h+and e-with low redox ability to recombine and retained the beneficial h+and e-with strong redox ability,which contributed to the production of more active species of h+and·02-,therefore the photocatalytic degradation and hydrogen evolution performance were significantly enhanced.
基金项目
国家自然科学基金(51962023)
国家自然科学基金(51772139)
江西省自然科学基金(20192ACBL21047)
江西省自然科学基金(20212BAB204045)
Key Lab-oratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle(Nanchang Hangkong University)(ES202002077)
2019 Project of Liaoning Education Depart-ment(2019LNJC20)
万方数据