Chinese Journal of Catalysis ›› 2022, Vol. 43 ›› Issue (10): 2690-2698.DOI: 10.1016/S1872-2067(22)64114-7
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Yu Zhanga,b, Ling Zhanga, Di Zenga,b, Wenjing Wanga, Juxue Wanga,b, Weimin Wanga, Wenzhong Wanga,b,c,*()
Received:
2022-03-14
Accepted:
2022-04-13
Online:
2022-10-18
Published:
2022-09-30
Contact:
Wenzhong Wang
Supported by:
Yu Zhang, Ling Zhang, Di Zeng, Wenjing Wang, Juxue Wang, Weimin Wang, Wenzhong Wang. An efficient strategy for photocatalytic hydrogen peroxide production over oxygen-enriched graphitic carbon nitride with sodium phosphate[J]. Chinese Journal of Catalysis, 2022, 43(10): 2690-2698.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64114-7
Fig. 1. (a) XRD patterns of CN, OCN4, OCN8, OCN12, and OCN20. (b) N2 adsorption-desorption isotherms. (c) Pore size distribution analyses for CN and OCN8. (d) O2-TPD patterns of CN and OCN8.
Fig. 2. Survey XPS spectrum (a) and high-resolution XPS spectra of O 1s (b), N 1s (c), and C 1s (d) for CN and OCN8. (e) EPR spectra of CN and OCN8 at 100 K in the dark. (f) FTIR of CN and OCN8.
Fig. 3. (a) Illustration of the possible existing form of oxygen atoms in the framework of g-C3N4. UV-vis absorption spectra (b) and plots of transformed Kubelka-Munk function versus photon energy (c) for CN and OCN8; Mott-Schottky plots of CN (d) and OCN8 (e).
Fig. 4. (a) Photocatalytic H2O2 productivity of various samples with different acid treatment time. (b) Effect of Na3PO4 with different concentrations on the photocatalytic H2O2 evolution rate of OCN8 under visible irradiation. (c) Comparative results of the photocatalytic H2O2 production activity of CN, OCN4, OCN8, OCN12, and OCN20 in 10% IPA with and without 5 mmol L-1 Na3PO4 under visible-light irradiation. (d) Photocatalytic stability of CN and OCN8 under visible-light irradiation in 10% IPA solution and 10% IPA solution with Na3PO4.
Fig. 5. (a) PL spectra of the CN, OCNx (x = 4, 8, 12, and 20 h), and OCN8 after photocatalytic reaction (OCN8-P) with an excitation wavelength of 400 nm. (b) Time-resolved fluorescence decay of CN, OCN8, and OCN8 after photocatalytic reaction (excitation wavelength: 340 nm). (c) Photocurrent responses of the photocatalysts. (d) EIS spectra of CN, OCN8, and OCN8-P.
Fig. 6. EPR spectra of 5,5-dimethyl-1-pyrroline-N-oxide (DMPO)-•O2- adduct (a) and TEMP-1O2 adduct (b) for OCN8 under light illumination and in the dark. (c) EPR spectra of the TEMP-1O2 adduct after adding PBQ with and without OCN8. (d) Schematic illustration of OCN for the photocatalytic H2O2 production.
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