Title
Facile fabrication of ordered mesoporous graphitic carbon nitride for RhB photocatalytic degradation
Author
Lei Luo, Anfeng Zhang, Michael J. Janik, Keyan Li, Chunshan Song, Xinwen Guo
Year
2017
Journal
Applied Surface Science
Abstract
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, N2 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 m2/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 SBET, reduced bandgap energy and limited charge recombination, the facile-prepared ordered mesoporous g-C3N4 is a practical candidate for further modification.
Instrument
FP-6200
Keywords
Photoluminescence, Materials, Fluorescence