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在空气中直接加热三聚氰胺和氧化石墨烯(GO)的混合物制备了g-C3N4/r GO杂化催化剂.实验结果表明,混合物中的g-C3N4保留了石墨型氮化碳原始的特征结构,g-C3N4和还原的氧化石墨烯(rG O)之间的异质结主要通过π-π作用构筑.当原料中三聚氰胺/GO的质量比是800/1时,所得催化剂对罗丹明B的催化作用最强,其一阶动力学常数是纯g-C3N4的2.6倍.这种强化作用主要是由于r GO促进了光生电子-空穴对的分离.此外,g-C3N4/r GO还表现出显著的p H值敏感特性,催化降解速率随p H的降低而增加.当p H=1.98时,其一阶动力学常数是纯g-C3N4的8.6倍.这是由于酸性条件下质子(H+)消耗掉光生电子,促进了空穴对罗丹明B的氧化作用,其中r GO充当了一个快速的光生电子转移平台.
G-C3N4 / r GO hybrid catalyst was prepared by directly heating a mixture of melamine and graphene oxide (GO) in air.The experimental results show that g-C3N4 in the mixture retains the original structure of graphite carbon nitride and g The heterojunction between -C3N4 and reduced graphene oxide (rGO) is mainly constructed by π-π interaction.When the mass ratio of melamine / GO in the raw material is 800/1, the catalytic activity of the obtained catalyst on rhodamine B The first order kinetic constant is 2.6 times that of pure g-C3N4, which is mainly due to the fact that rGO promotes the photo-electron-hole pair separation.In addition, g-C3N4 / rGO also shows significant , The first-order kinetic constant is 8.6 times that of pure g-C3N4 at p H = 1.98, which is due to the proton (H + Consume the photo-generated electrons and promote the oxidation of holes to rhodamine B, of which r GO acts as a fast photogenerated electron transfer platform.