From Melamine-Cyanuric Acid Supramolecular Aggregates to Carbon Nitride Hollow Spheres

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Graphitic carbon nitride (g-CN) is a promising heterogeneous metal-free catalyst for organic photosynthesis, solar energy conversion, and photodegradation of pollutants. Its catalytic performance is easily adjustable by modifying texture, optical, and electronic properties via nanocasting, doping, and copolymerization. However, simultaneous optimization has yet to be achieved. Here, a facile synthesis of mesoporous g-CN using molecular cooperative assembly between triazine molecules is reported. Flower-like, layered spherical aggregates of melamine cyanuric acid complex (MCA) are formed by precipitation from equimolecular mixtures in dimethyl sulfoxide (DMSO). Thermal polycondensation of MCA under nitrogen at 550 degrees C produces mesoporous hollow spheres comprised of tri-s -triazine based g-CN nanosheets (MCA-CN) with the composition of C3N4.14H1.98. The layered structure succeeded from MCA induces stronger optical absorption, widens the bandgap by 0.16 eV, and increases the lifetime of photoexcited charge carriers by twice compared to that of the bulk g-CN, while the chemical structure remains similar to that of the bulk g-CN. As a result of these simultaneous modifi cations, the photodegradation kinetics of rhodamine B on the catalyst surface can be improved by 10 times.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2013-08
Language
English
Article Type
Article
Keywords

VISIBLE-LIGHT IRRADIATION; SOLID-STATE NMR; HARD TEMPLATES; METAL NITRIDE; G-C3N4; PHOTODEGRADATION; PHOTOCATALYSTS; SEMICONDUCTORS; NANOPARTICLES; CONDENSATION

Citation

ADVANCED FUNCTIONAL MATERIALS, v.23, no.29, pp.3661 - 3667

ISSN
1616-301X
DOI
10.1002/adfm.201203732
URI
http://hdl.handle.net/10203/188454
Appears in Collection
CBE-Journal Papers(저널논문)
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