介孔石墨相氮化碳纳米片的制备及光催化抗菌性能研究

Facile preparation of mpg-C_3N_4 nanosheet for enhanced photocatalytic disinfection performance

采用盐酸预处理三聚氰胺后煅烧的方法制备介孔石墨相氮化碳纳米片(mpg-C_3N_4)。通过X射线衍射、红外光谱、扫描电镜、紫外-可见光光谱、荧光光谱和比表面积对样品的性质进行表征,并研究石墨相氮化碳(g-C_3N_4)和mpg-C_3N_4的光催化抗菌(大肠杆菌)活性。mpg-C_3N_4和g-C_3N_4具有相同的分子结构,但mpg-C_3N_4的介孔和超薄纳米片结构有效增大了比表面积,同时显著降低了光生e^-和h^+的复合率,从而表现出优异的光催化抗菌活性。h^+和·O_2^-是mpg-C_3N_4光催化抗菌过程中主要的活性基团。

Mesoporous g-C3N4 nanosheets（mpg-C3N4）were synthesized via the calcination of melamine pretreated by HCl.The samples were characterized by XRD,FT-IR,TEM,UV-Vis,PL and BET.The photocatalytic activities were evaluated by the photocatalytic disinfection of E.coli.Mpg-C3N4 had similar molecular structure with g-C3N4,but the specific surface area of mpg-C3N4 was much larger than that of g-C3N4 due to the structure of mesoporous and ultrathin nanosheets which restricted the recombination of photogenerated electrons and holes.Therefore,mpg-C3N4 exhibited the more excellent photocatalytic disinfection performances.h^＋ and·O2^- were the major active radicals in the photocatalytic disinfection of E.coli.