J. Mater. Sci. Technol. ›› 2021, Vol. 85: 18-29.DOI: 10.1016/j.jmst.2020.12.064
• Research Article • Previous Articles Next Articles
Wei Zhaoa,b,c, Tiantian Sheb, Jingyi Zhangb, Guoxiang Wanga,*(
), Sujuan Zhangf, Wei Weia, Gang Yangc, Lili Zhangb,*(), Dehua Xiae, Zhipeng Chengb, Haibao Huange, Dennis Y.C. Leungd,*()
Received:2020-09-09
Revised:2020-12-15
Accepted:2020-12-31
Published:2021-09-20
Online:2021-02-08
Contact:
Guoxiang Wang,Lili Zhang,Dennis Y.C. Leung
About author:ycleung@hku.hk (D.Y.C. Leung).Wei Zhao, Tiantian She, Jingyi Zhang, Guoxiang Wang, Sujuan Zhang, Wei Wei, Gang Yang, Lili Zhang, Dehua Xia, Zhipeng Cheng, Haibao Huang, Dennis Y.C. Leung. A novel Z-scheme CeO2/g-C3N4 heterojunction photocatalyst for degradation of Bisphenol A and hydrogen evolution and insight of the photocatalysis mechanism[J]. J. Mater. Sci. Technol., 2021, 85: 18-29.
Fig. 1. Schematic illustration of the synthesis of the Z-scheme CeO2/g-C3N4 heterojunction photocatalyst.
Fig. 2. (a) XRD patterns of the as-prepared samples; XPS spectra of (b) survey, (c) C 1s, (d) N 1s, (e) Ce 3d, and (f) O 1s.
Fig. 3. FESEM images of (a) carbon spheres, (b-d) hollow CeO2 mesoporous nanospheres, (e-f) g-C3N4 nanosheets.
Fig. 4. FESEM images of (a, b) CeO2/g-C3N4-3, (c, d) CeO2/g-C3N4-6, (e, f) CeO2/g-C3N4-12.
Fig. 5. (a, b) TEM and (c) SAED pattern of the hollow CeO2 nanospheres, (d, e) TEM and (f) HRTEM images of CeO2/g-C3N4-6.
Fig. 6. Elemental mapping of the CeO2/g-C3N4-6 photocatalyst.
Fig. 7. (a) Nitrogen adsorption-desorption isotherm of the samples; (b) The pore size distribution of the CeO2/g-C3N4-6; (c) UV-vis absorption spectra and (d-f) the plot of (αhν)2 vs energy hν and band gap energy of the samples.
Fig. 8. (a) Photocatalytic activities and (b) five recycling runs for BPA degradation, (c) TOC removal of BPS for the CeO2/g-C3N4-6; (d) Photocatalytic activities and (e) the stability for hydrogen evolution, (f) the effect of quenchers on the BPA degradation.
Fig. 9. (a) Thermogravimetric Analysis and (b, c) EPR spectra of the sample.
Fig. 10. Proposed photocatalytic degradation pathway of BPA.
Fig. 11. (a) PL spectra and (b, c) TRPL spectra of the as-prepared samples. (d) Photocurrent, (e) electrochemical impedance spectroscopy and (f, g) Mott-Schottky curves of as-prepared samples.
Fig. 12. Crystal structures of (a) g-C3N4, and (b) CeO2. Calculated band structures and projected density of states of g-C3N4 (c and e) and CeO2 (d and f).
Fig. 13. VB-XPS spectra of the (a) g-C3N4 and (b) CeO2. The Fermi level EF is located at E =0 eV, as marked by the vertical dotted line. The work function of (c) g-C3N4, and (d) CeO2.
Fig. 14. (a) Proposed type-II staggered band alignment of CeO2/g-C3N4, (b) photocatalysis enhancement mechanism of the Z-scheme CeO2/g-C3N4.
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