Higher Yield Urea-Derived Polymeric Graphitic Carbon Nitride with Mesoporous Structure and Superior Visible-Light-Responsive Activity

Abstract

A series of mesoporous graphitic carbon nitride (mg-C 3 N 4 ) materials have been prepared with urea and tetraethylorthosilicate (TEOS) as the precursors, which were thermally polycondensed to obtain the g-C 3 N 4 /silica composites, after silica was removed, mg-C 3 N 4 with large surface area (170 m 2 g –1 ) was successfully prepared. Excitingly, TEOS did not only act as a mesoporous-directing agent but also as the promoter for the urea polycondensation to g-C 3 N 4, which made the urea polycondensation proceed at relatively low temperature. Thus, volatilization or/and decomposition of urea in the process of thermal treatment were reduced, resulting in the product yield of g-C 3 N 4 from 0.3 to 0.4 g/10 g urea remarkably increasing to 1.2 g/10 g urea. Moreover, superior photocatalytic activities were observed for degrading methyl orange (MO) and H 2 generation from water splitting over the mg-C 3 N 4 photocatalyst. The facilely developed method for high-yield mesoporous g-C 3 N 4 from cost-effective urea was more attractive for its wide applications in environmental treatment and energy development fields.