期刊
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
卷 37, 期 1, 页码 125-133出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2011.09.072
关键词
Hydrogen; Graphitic carbon nitride; Melamine; Photocatalysts; Thermoanalytical methods (TG-DSC)
资金
- Fundamental Research Funds for the Central Universities [2009SCU11105]
- Dalian Institute of Chemical Physics
Herein we report the synthesis of graphitic carbon nitride (g-C3N4) by directly heating sulfuric acid treated melamine precursor. Thermoanalytical methods (TG-DSC) in combination with XRD, XPS and elemental analysis were used to characterize the condensation steps of the precursor. The TG-DSC curves clearly show significant difference in thermal behavior between the treated and untreated melamine. The sublimation of melamine during condensation was significantly suppressed by treating melamine with sulfuric acid. The decomposition of melamine sulfuric acid and the condensation of melamine occur simultaneously. The N/C ratio of the prepared carbon nitride (1.53) is slight higher than that of the ideal crystal g-C3N4 (1.33), indicating the incomplete condensation of amino groups in the material. The XPS and elemental analysis show that there is no sulfur residue in the final product. The sample synthesized from sulfuric acid treated melamine shows relatively higher BET surface area. The photocatalytic performance of the as prepared carbon nitride was evaluated under visible light irradiation (lambda > 420 nm). The photocatalytic H-2 production rate on sample synthesized from sulfuric acid treated melamine is 2 times higher than that on sample synthesized from untreated melamine. Copyright (C) 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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