Zhu Kaixing, Du Yanyan, Liu Jing, Fan Xiaoyan, Duan Zhenya, Song Guanying, Meng Alan, Li Zhenjiang, Li Qingdang
J Nanosci Nanotechnol. 2017 Apr;17(4):2515-519. doi: 10.1166/jnn.2017.13439.
A facile In Situ growth method was presented here for the preparation of graphitic carbon nitride (g-C3N4)/graphene composites, in which the direct growth and deposition of g-C3N4 nanosheets from organic N and C sources on the graphene surfaces was achieved to form the 3D contacted structure. The resulting 3D architecture possessed multilevel porous structure and efficient g-C3N4/graphene interfaces, which facilitated the fast electron transfer at the interfaces. Photoluminescence spectra showed that the recombination of photogenerated electrons and holes in the g-C3N4/graphene composites was greatly inhibited by the introduction of graphene, indicating the more efficient separation of electrons and hole in the g-C3N4/graphene composites than in pure g-C3N4. The catalytic activity of g-C3N4/graphene composite photocatalyst was enhanced by over two fold compared to pure g-C3N4 for removal of Rhodamine B under simulated sun light irradiation. This work indicates that the metal-free g-C3N4/graphene composite photocatalyst is a promising nanomaterial for further applications in water treatment.
本文提出了一种简便的原位生长方法来制备石墨相氮化碳（g-C3N4）/石墨烯复合材料，该方法通过有机氮源和碳源在石墨烯表面直接生长和沉积g-C3N4纳米片，形成三维接触结构。所得的三维结构具有多级多孔结构和高效的g-C3N4/石墨烯界面，有利于界面处的快速电子转移。光致发光光谱表明，石墨烯的引入极大地抑制了g-C3N4/石墨烯复合材料中光生电子和空穴的复合，这表明g-C3N4/石墨烯复合材料中电子和空穴的分离比纯g-C3N4中更有效。在模拟太阳光照射下，g-C3N4/石墨烯复合光催化剂对罗丹明B的去除催化活性比纯g-C3N4提高了两倍多。这项工作表明，无金属的g-C3N4/石墨烯复合光催化剂是一种有前途的纳米材料，可进一步应用于水处理领域。
