g-C_3N_4纳米片的制备及光催化抗菌性能研究

Preparation of g-C_3N_4 nanosheet and its photocatalytic antibacterial performance

采用液相超声法成功地将体相g-C_3N_4剥离为g-C_3N_4纳米片。通过XRD、FT-IR、TEM、BET和瞬态光电流对样品的性质进行表征,并研究g-C_3N_4纳米片光催化杀灭大肠杆菌(E.coli)和金黄色葡萄球菌(S.aureus)的活性。结果表明,将体相g-C_3N_4剥离为g-C_3N_4纳米片并没有改变分子结构,但g-C_3N_4纳米片光催化杀灭E.coli和S.aureus的活性均优于体相gC_3N_4。g-C_3N_4纳米片的超薄二维结构具有大的比表面积,是体相g-C_3N_4的6.97倍,同时有效地促进了光生电子和空穴的分离,两方面的协同作用下,g-C_3N_4纳米片表现出优异的光催化抗菌活性。

The g-C3N4 nanosheets are successfully stripped from bulk g-C3N4 by liquid ultrasonic method. The sample sheets are characterized by XRD,FT-IR,TEM,BET and transient photocurrent.The photocatalytic activities of gC3N4 nanosheets are evaluated through killing E. coli and S. aureus. The results indicate that the prepared g-C3N4 nanosheets have the same molecular structure as bulk g-C3N4,but exhibit superior photocatalytic antibacterial performance to the bulk. Due to ultra-thin two-dimensional structure,the g-C3N4 nanosheets have large specific surface area,6. 97 times that of bulk g-C3N4,while this structure can effectively promote the separation between photogenerated electrons and holes. Under the synergistic effect of the large specific surface area and efficient separation of photogenerated electrons,g-C3N4 nanosheets show the excellent photocatalytic antibacterial activity.