期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 171, 期 -, 页码 229-237出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2016.07.025
关键词
CQDs; g-C3N4; Heterojunctions; Rhodamine B; Tetracycline hydrochloride
资金
- National Natural Science Foundation of China [21276116, 21477050, 21301076, 21303074, 21522603, 21576121]
- Chinese-German Cooperation Research Project [GZ1091]
- China Postdoctoral Science Foundation [2015M571689]
- Excellent Youth Foundation of Jiangsu Scientific Committee [BK20140011]
- Program for New Century Excellent Talents in University [NCET-13-0835]
- Jiangsu Postdoctoral Science Foundation [1402100C]
- Henry Fok Education Foundation [141068]
- Six Talents Peak Project in Jiangsu Province [XCL-025]
Novel carbon quantum dots (CQDs)/graphitic-like carbon nitride (g-C3N4) metal-free heterojunctions were firstly synthesized via a facile low temperature process. Multiple physicochemical techniques were carried out to characterize the samples. The CQDs with the average size of about 5 nm are attached to the surfaces of g-C3N4 nanosheets. The photocatalytic activity of as-prepared samples was carefully evaluated by the degradation of rhodamine B (RhB) and tetracycline hydrochloride (TC-HCI) under visible light irradiation. Photocatalysis result displayed that the CQDs/g-C3N4 heterojunctions can significantly enhance visible-light photocatalytic activity in compared to that of pristine g-C3N4. The reaction rate constant of the optimum active C0.50%/CN heterojunction for the photodegradation of RhB and TC-HCI were about 3.7-fold and 1.9-fold higher than that of bare g-C3N4, respectively. The efficiently enhanced photoactivity was attributed to the CQDs not only can improve the photogenerated electron-hole pair's separation, but also can increase light harvesting by the up-conversion photoluminescence behavior. Moreover, the as -prepared C0.50%/CN sample also exhibited excellent photostability and recyclability for both photodegradation of RhB and TC-HCI. In addition, the possible enhanced photocatalytic mechanism was proposed and analyzed by the active species trapping experiments. This work will bring about potential for application in environmental purification and useful for designing other CQDs-based photocatalyst in energy conversion. (C) 2016 Published by Elsevier B.V.
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