采用液相超声法成功地将体相g-C₃N₄剥离为g-C₃N₄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-C₃N₄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-C₃N₄剥离为g-C₃N₄纳米片并没有改变分子结构，但g-C₃N₄纳米片光催化杀灭E. coli和S. aureus的活性均优于体相g-C₃N₄。g-C₃N₄纳米片的超薄二维结构具有大的比表面积，是体相g-C₃N₄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-C₃N₄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 g-C₃N₄ 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.

马占强(1978-),男,博士,副教授,研究方向为生物修复和微生物资源利用,mzqnxy@163.com。