Tuning and thermal exfoliation graphene-like carbon nitride nanosheets for superior photocatalytic activity |
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| Affiliation: | 1. Institute for Clean Energy & Advanced Materials, Faculty of Materials and Energy, Southwest University, Chongqing 400715, PR China;2. Chongqing Academy of Animal Sciences, Chongqing 402460, PR China;1. College of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China;2. Chongqing Academy of Science and Technology, Chongqing 401123, China;1. School of Materials Science and Engineering, Hebei Provincial Key Laboratory of Traffic Engineering Materials, Shijiazhuang Tiedao University, Shijiazhuang, 050043, PR China;2. Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, PR China;3. Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA;4. College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot, 010051, PR China |
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| Abstract: | In this work, ultrathin graphene-like carbon nitride nanosheets with rich nanoporous and excellent hydrophilic characteristics were synthesized by a simple and effective thermal exfoliation of bulk g-C3N4. In order to fully understand the effect of thermal exfoliation conditions on the texture, surface state, and photocatalytic activity of the resulting g-C3N4, a series of exfoliated g-C3N4 were prepared by adjusting the thermal exfoliation temperature and time. The detailed characterization and analysis distinctly suggested that increasing exfoliation temperature led to a large number of nitrogen vacancies and increased specific surface area, further prolonging exfoliation time, the thermal exfoliation degree was enhanced, more carbon vacancies and enlarged pore volume formed in the resulting products. Further, the exfoliation degree and photocatalytic ability of the resultant products were enhanced by increasing thermal exfoliation temperature and time. The optimized ultrathin graphene-like carbon nitride nanosheets exhibited a 89.6% degradation efficiency for Rh6G only in 10 min, which was much faster than other such nanosheets reported in previous literature. |
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| Keywords: | Graphene-like carbon nitride nanosheets Thermal oxidation exfoliation Visible light photocatalysts |
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