title: Enhancement photocatalytic activity of the graphite-like C₃N₄ coated hollow pencil-like ZnO.
abstract: The pencil-like ZnO hollow tubes with 9-12 μm in length, 350-700 nm in width, 200 nm in wall thickness coating with g-C3N4 have been prepared via a chemical deposition process. As compared with uncoated ZnO or g-C3N4, these g-C3N4/ZnO composites showed the enhanced photocatalytic activity which can be attributed to the heterojunction structure. Furthermore, it is worth pointing out that the weight ratios of g-C3N4 to ZnO (g-C3N4/ZnO) played a significantly influence on the photodegradable properties. With increasing the mass ratio, the photocatalytic activity increased firstly and then decreased after reaching to an optimal photocatalytic performance. It can be inferred that the appreciation of g-C3N4 on the ZnO surface can improve the contact area which resulted in high separation of electrons and holes. However, excessive g-C3N4 may hinder the electrons transferring from the g-C3N4 to ZnO, and thus worse its photocatalytic performance. In our study, the g-C3N4/ZnO sample prepared with 10 wt% of g-C3N4 exhibited the optimal photodegradable efficiency which 94% of Rhodamine B (RhB) has been degraded just in 2 h.
authors: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
authors: Hualiang
authors: H
authors: Lv
authors: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China. Electronic address: gbji@nuaa.edu.cn.
authors: Guangbin
authors: G
authors: Ji
authors: Temasek Laboratories, National University of Singapore, Singapore 117411, Singapore.
authors: Zhihong
authors: Z
authors: Yang
authors: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
authors: Yousong
authors: Y
authors: Liu
authors: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
authors: Xingmiao
authors: X
authors: Zhang
authors: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
authors: Wei
authors: W
authors: Liu
authors: College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, PR China.
authors: Haiqian
authors: H
authors: Zhang
keywords: Pencil-like hollow ZnO; Photocatalytic properties; Weight ratio; g-C(3)N(4)/ZnO