CeO2 quantum dots anchored g-C3N4: synthesis, characterization and photocatalytic performance

被引：27

作者：

Sun, Youwei ^{[1
]}

Yuan, Xingzhou ^{[1
]}

Wang, Yanjuan ^{[1
]}

Zhang, Wanshu ^{[1
]}

Li, Yanda ^{[1
]}

Zhang, Zhuolei ^{[2
]}

Su, Ji ^{[2
]}

Zhang, Jian ^{[1
]}

Hu, Shaozheng ^{[1
]}

机构：

[1] Liaoning Petrochem Univ, Fushun 113001, Peoples R China

[2] Berkeley Natl Lab, Berkeley, CA 94720 USA

来源：

APPLIED SURFACE SCIENCE | 2022年 / 576卷

关键词：

Carbon nitride; Cerium dioxide; Quantum dots; Photocatalysis; GRAPHITIC CARBON NITRIDE; SELECTIVE CATALYTIC-REDUCTION; ONE-POT SYNTHESIS; ELECTRONIC-STRUCTURE; HYDROGEN-PRODUCTION; FACILE SYNTHESIS; HETEROJUNCTION; DEGRADATION; CERIA; PHOTODEGRADATION;

D O I：

10.1016/j.apsusc.2021.151901

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Cerium dioxide quantum dots (CeO(2)QDs) modified graphitic carbon nitride (g-C3N4) was fabricated by a facile chemical reaction with urea and cerium nitrate hexahydrate as precursors. Combined X-ray diffraction (XRD), UV-Vis DRS, transmission electron microscopy (TEM), photoluminescence spectroscopy (PL), Electrochemical impedance spectra (EIS), Thermogravimetric analysis (TGA), Brunner-Emmet-Teller (BET) measurements and X-ray photoelectron spectroscopy (XPS) studies showing that CeO(2)QDs dispersed homogeneously on the g-C3N4 surface, which enhanced the absorption in visible light region. Specifically, we found that CeO(2)QDs/g-C3N4 shows much lower electron-hole recombination rate, and its Rhodamine B photodegradation rate constant can reach 0.00985 min(-1) , which is 7 times higher than that of single g-C3N4. In addition, the CeO(2)QDs/g-C3N4 displayed outstanding catalytic stability. Furthermore, the CeO(2)QDs/g-C3N4 catalyst also exhibited the excellent photodegradation performance on other substrates such as TC, Methyl Orange, and Methyl Blue. It was proposed that the CeO(2)QDs/g-C3N4 photocatalyst could follow a more appropriate Z-scheme charge transfer mechanism. Our studies extend the application of Quantum dots nanocomposite catalyst and pave the way for its further rational design.

引用

页数：10

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