在液相超声剥离制备g-C3N4纳米片的基础上，通过光照还原法负载Ag纳米颗粒，成功构筑Ag/g-C3N4纳米片，通过透射电子显微镜(TEM)、红外光谱仪(FT-IR)、X-射线衍射仪(XRD)、比表面积和孔分析仪(BET)和瞬态光电流等方法对制备的样品进行表征，考察可见光下杀灭E.coli能力以表征其光催化活性，并通过改进的Hom模型对样品的光催化抗菌动力学进行研究。研究结果表明，3%Ag/g-C3N4纳米片具有最优的光催化抗菌活性，光催化抗菌曲线拟合的k2值是体相g-C3N4的2.99倍，是3%Ag/体相g-C3N4的1.45倍。大的比表面积和良好的光生载流子分离效率是3%Ag/g-C3N4纳米片具有优异光催化抗菌活性的主要原因。

On the basis of g-C3N4nanosheets prepared by liquid phase ultrasonic exfoliation, Ag/g-C3N4nanosheets were fabricated by loading Ag nanoparticles through the method of light reduction. The as-prepared samples were characterized by TEM, FT-IR, XRD, BET and transient photocurrent. The disinfection of Escherichia coli(E. coli) was studied to evaluate the photocatalytic activity under visible light. The photocatalytic antibacterial kinetics were researched by modified Hom model. The results show that 3% Ag/g-C3N4 nanosheets exhibit the optimal photocatalytic disinfection of E. coli and the k2 value of 3% Ag/g-C3N4 nanosheets is 2.99 times of bulk g-C3N4 and 1.45 times of 3% Ag/bulk g-C3N4. Large specific surface area and high photocarrier separation efficiency have resulted in the excellent photocatalytic antibacterial activity of 3% Ag/g-C3N4 nanosheets.