Abstract
The photocatalytic performance of graphite carbon nitride (g-C3N4) is controlled by its microstructure, and the study of the relationship between precursor types and g-C3N4 microstructure will be an interesting problem. In this paper, the thermal decomposition kinetics were applied to search the reaction process of the two g-C3N4 catalysts coming from two precursors of melamine (MA) and dicyandiamide (DCDA). It can be found that unlike the transition process of DCDA to g-C3N4, the reaction of MA is less hindered, and it readily undergoes thermal decomposition, resulting in MA-g-C3N4 catalyst having fewer amino groups. This further causes a decrease in electron cloud density in its conjugate structure, increasing the adsorption of the positive charged methylene blue, ultimately resulting in a degradation efficiency of MAg- C3N4 being 1.5 times that of DCDA- g-C3N4.
