Facile fabrication of ordered mesoporous graphitic carbon nitride for RhB photocatalytic degradation
发表时间：2019-03-12
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- 论文类型：
- 期刊论文
- 第一作者：
- Luo, Lei
- 通讯作者：
- Song, CS; Guo, XW (reprint author), Dalian Univ Technol, Sch Chem Engn, PSU DUT Joint Ctr Energy Res, State Key Lab Fine Chem, Dalian 116024, Peoples R China.
- 合写作者：
- Zhang, Anfeng,Janik, Michael J.,Li, Keyan,Song, Chunshan,Guo, Xinwen
- 发表时间：
- 2017-02-28
- 发表刊物：
- APPLIED SURFACE SCIENCE
- 收录刊物：
- SCIE、EI
- 文献类型：
- J
- 卷号：
- 396
- 页面范围：
- 78-84
- ISSN号：
- 0169-4332
- 关键字：
- Graphitic carbon nitride; Mesoporous; Photocatalytic
- 摘要：
- Ordered mesoporous graphitic carbon nitrides were prepared by directly condensing the uniform mixtures of melamine and KIT-6. After removal of the KIT-6 sacrificial template, the carbon nitrides were characterized with TEM, N-2 physical adsorption, XRD, FT-IR, XPS, UV-vis and PL spectrometries, and tested for their RhB photocatalytic degradation activity. Together, these characterizations confirmed the as-prepared tunable mesoporous materials with enhanced charge separation efficiency and superior photocatalytic performance. Compared with a conventional bulk g-C3N4, ordered mesoporous g-C3N4 exhibits a larger specific surface area of 279.3 m(/)(2)g and a pore size distribution about 4.0 nm and 13.0 nm. Meanwhile, the reduced bandgap energy of 2.77 eV and lower photogenerated electron-hole pair recombination frequency were evidenced by UV-Vis and PL spectra. The RhB photocatalytic degradation activity maximizes with a mass ratio of KIT-6/melamine of 80% (KCN80), and the kinetic constant reaches 0.0760 min(-1) which is 16 times higher than that of the bulk sample. Reusability of KCN80 was demonstrated by a lack of evident deactivation after three consecutive reaction periods. The direct condensation of the KIT-6 and melamine mixture does not require pre-casting of the precursor into the pore system of the templates. Owing to its high product yield, improved S-BET, reduced bandgap energy and limited charge recombination, the facile-prepared ordered mesoporous g-C3N4 is a practical candidate for further modification. (C) 2016 Elsevier B.V. All rights reserved.
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