Photocatalytic Properties of MOF-Derived TiO2-Modified Graphitic Carbon Nitride

被引：0
|
作者：
Zhao X. [1 ]
He F. [1 ,2 ,3 ]
Shi C. [1 ,2 ,3 ]
Yan D. [1 ]
Wang C. [1 ]
机构：
[1] School of Materials Science and Engineering, Tianjin University, Tianjin
[2] Key Laboratory of Advanced Ceramics and Machining Technology, Tianjin University, Tianjin
[3] Tianjin Key Laboratory of Composite and Functional Materials, Tianjin
来源：
Tianjin Daxue Xuebao (Ziran Kexue yu Gongcheng Jishu Ban)/Journal of Tianjin University Science and Technology | 2019年 / 52卷 / 05期
基金：
中国国家自然科学基金;
关键词：
G-C[!sub]3[!/sub]N[!sub]4[!/sub; Metal-organic framework; Photocatalytic hydrogen production; TiO[!sub]2[!/sub;
D O I：
10.11784/tdxbz201809072
中图分类号：
学科分类号：
摘要：
Graphitic carbon nitride(g-C3N4)is a promising organic photocatalytic material, especially in visible-light-driven photocatalytic water-splitting hydrogen production. However, poor photogenerated carrier separation efficiency severely restricts the photocatalytic activity of g-C3N4. Using titanium dioxide(TiO2)as modifier and constructing a reasonable heterostructure on the surface of g-C3N4can effectively solve the aforementioned problem, but it needs a reasonable design. In this study, MOF-derived TiO2-modified g-C3N4composites were prepared through a facile preparation process using metal-organic frameworks(MOFs)as sacrificial template. The prepared MOF-derived TiO2 has a large specific surface area of 124.5m2/g and is a mixture of anatase and rutile phases, which can effectively increase the photoelectron separation efficiency of the photocatalyst and provide more active sites for the photocatalytic reaction. XRD, SEM, TEM, UV-Vis, PL, and other characterization methods were used to characterize the phase and related spectroscopic and electrochemical properties of the materials in detail, and the optimized process parameters were determined by composition control. Results show that the MOF-derived TiO2-modified g-C3N4 composite photocatalyst exhibits good carrier separation efficiency with the increase in the loading of TiO2, but its visible light response decreases accordingly. Therefore, the optimum load to balance the effects of MOF and TiO2 exists, resulting in the highest photocatalytic activity. Notably, the photocatalytic activity of the photocatalyst with 6% TiO2 exhibited the highest hydrogen production rate of 836 μmol/(g•h) under visible light(λ≥420nm). The experimental results show that the heterojunction structure constructed using MOF-derived TiO2-modified g-C3N4 can effectively inhibit the recombination of photogenerated carriers, thus significantly improving the photocatalytic decomposition of water for hydrogen production. © 2019, Editorial Board of Journal of Tianjin University(Science and Technology). All right reserved.
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页码：539 / 544
页数：5
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