Abstract
In this study,water-dispersible graphitic carbon nitride(g-C3N4)photocatalysts were successively pre-pared through the chemically oxidative etching of bulk g-C3N4 that was polymerized thermally in dif-ferent calcination atmospheres such as air,CO2,and N2.The different calcination atmospheres directly influenced the physicochemical and optical properties of both bulk and water-dispersible g-C3N4,chang-ing the photocatalytic degradation behavior of methylene blue(MB)and tetracycline hydrochloride(TC-HCl)for water-dispersible g-C3N4.The bubble-burst process in the thermal polymerization of thiourea produced defective edges containing C=O groups that preferred substituting the C-NHx groups over bulk g-C3N4.In the oxygen-free N2 atmosphere among the different calcination atmospheres,more C=O func-tional groups were generated on the defective edges of bulk g-C3N4,resulting in the highest N vacancy of the tri-s-triazine structure.During the successive chemical oxidation,S-or O-containing functional groups were introduced onto water-dispersible g-C3N4.The water-dispersible g-C3N4 photocatalyst from the oxygen-free N2 atmosphere(NTw)contained the most O-and S-functional groups on the g-C3N4 sur-face.Consequently,NTw exhibited the highest photocatalytic activity in the MB and TC-HCl photodegra-dation because of its slowest recombination process,which was ascribed to the unique surface properties of NTw such as abundant functional groups on the defective edges and N-deficient property.
基金项目
National Research Foundation of KoreaNRF)grant funded by the Korea government MSIT(2020R1A4A4079954)
National Research Foundation of KoreaNRF)grant funded by the Korea government MSIT(2021R1A2B5B01001448)
NETL
NSTL
万方数据