Morphology and defects regulation of carbon nitride by hydrochloric acid to boost visible light absorption and photocatalytic activity

[Display omitted] •A HCl-assisted exfoliation approach to prepare the ultrathin carbon nitride (U-CN) nanosheet was reported.•The morphology and defects of U-CN can be regulated with the change of HCl concentration.•The U-CN nanosheets exhibits enhanced hydrogen evolution and Rhodamine B degradation...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2017-11, Vol.217, p.629-636
Main Authors: Dong, Changchang, Ma, Zhiyuan, Qie, Runtian, Guo, Xuhong, Li, Cuihua, Wang, Rongjie, Shi, Yulin, Dai, Bin, Jia, Xin
Format: Article
Language:English
Subjects:
Adsorption
Carbon
Carbon nitride
Catalytic activity
Defects
Elections
Electromagnetic absorption
Exfoliation
Hydrochloric acid
Hydrogen evolution
Morphology
Morphology and defect regulation
Nanosheets
Oxidation
Photocatalysis
Photodegradation
Protonation
Rhodamine
Ultrathin carbon nitride nanosheets
Uranium
Visible light photocatalysis
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Summary:[Display omitted] •A HCl-assisted exfoliation approach to prepare the ultrathin carbon nitride (U-CN) nanosheet was reported.•The morphology and defects of U-CN can be regulated with the change of HCl concentration.•The U-CN nanosheets exhibits enhanced hydrogen evolution and Rhodamine B degradation rate under visible light.•The effects of HCl concentration on the exfoliation of BCN have been discussed. In this work, a hydrochloric acid assisted exfoliation approach to prepare the ultrathin carbon nitride (U-CN) nanosheet and to regulate its morphology and defects was reported. Based on moderate oxidation of hydrochloric acid, bulk carbon nitride (BCN) was just right broken into small pieces with protonation, which is beneficial to the exfoliation of BCN to U-CN nanosheets. Meanwhile, the main structure of CN do not be destroyed. Moreover, hydrochloric acid gives priority to cleave the bridging N atoms with rich elections, leading to the formation of the favorable defects and improving its photocatalytic performance. The obtained U-CN nanosheets prepared in a suitable HCl concentration exhibits enhanced photocatalytic efficiency for hydrogen evolution and Rhodamine B degradation under visible light. Such U-CN nanosheets with simple preparation, low cost, good yield and good photocatalytic activity might shed light on an acid-assisted method for developing high-performance CN photocatalysts.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2017.06.028