期刊
CARBON
卷 125, 期 -, 页码 454-463出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2017.09.084
关键词
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资金
- National Natural Science Foundation of China [51571123, 51671108, 51101088]
- Tianjin Natural Science Foundation [17JCZDJC37000]
- National Basic Research Program of China (973 Program) [2014CB931703]
Graphitic carbon nitride (g-C3N4) has been considered as a promising metal-free catalyst for a wide range of application due to its intriguing properties. However, the photocatalytic performance is restricted by the small specific surface area (SSA) and limited active sites. Here, a facile one-step method was employed to prepare thin porous g-C3N4 with large SSA by condensation of urea. During the pyrolysis process, the self-generated NH3 not only participates in the condensation reaction to obtain bulk g-C3N4, but also etches crystal lattice to form thinner nanosheets. A high SSA of 141.4 m(2) g(-1) for the sample synthesized in the enclosed condition (ECD-CN) is obtained, which is much larger than the SSA of 57.4 m(2) g(-1) for the sample synthesized in the non-enclosed condition (NCD-CN). These porous nanosheets with the enhanced SSA endow g-C3N4 more exposed active sites and shorten the carrier diffusion length. As a result, the ECD-CN sample exhibits much higher photodegradation rate on rodamine B (99.0% within 10 min) and hydrogen evolution rate (504.2 mu mol h(-1) g(-1)) under visible-light. This study provides a facile and template-free strategy in preparing efficient, sustainable and visible-light-driven photocatalyst. (C) 2017 Elsevier Ltd. All rights reserved.
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