Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (4): 627-636.DOI: 10.1016/S1872-2067(20)63684-1
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Yang Lia,b, Dainan Zhanga, Jiajie Fanc, Quanjun Xianga,*()
Received:
2020-05-26
Accepted:
2020-07-11
Online:
2021-04-18
Published:
2021-01-22
Contact:
Quanjun Xiang
About author:
*Tel/Fax: +86-28-83207063; E-mail: xiangqj@uestc.edu.cnSupported by:
Yang Li, Dainan Zhang, Jiajie Fan, Quanjun Xiang. Highly crystalline carbon nitride hollow spheres with enhanced photocatalytic performance[J]. Chinese Journal of Catalysis, 2021, 42(4): 627-636.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(20)63684-1
Fig. 1. Schematic diagram of synthesis process over CCNHS samples by using the CM as a precursor by molten salts method and the corresponding morphological structure and chemical molecular structure of as-prepared samples.
Fig. 2. (a, b) SEM images of CM-CN; (c, d) SEM images of CCNHS, the scale bar of the inset in (d) is 100 nm; (e, g) HRTEM images of CM-CN, the scale bar of the inset in (e) is 100 nm; (f, h) HRTEM images of CCNHS, the scale bar of the inset in (f) is 50 nm.
Samples | FWHM(002) a | Surface area b (m2 g-1) | Pore volume b (cm3 g-1) | C c (Atom%) | N c (Atom%) | N/C d |
---|---|---|---|---|---|---|
CCNHS | 1.043 | 185.6 | 0.689 | 32.77 | 46.78 | 1.43 |
CM-CN | 2.455 | 60.46 | 0.209 | 35.82 | 56.51 | 1.58 |
BCN | 1.470 | 13.12 | 0.081 | 38.67 | 57.45 | 1.48 |
Table 1 Textural properties and chemic composition of the as-prepared samples.
Samples | FWHM(002) a | Surface area b (m2 g-1) | Pore volume b (cm3 g-1) | C c (Atom%) | N c (Atom%) | N/C d |
---|---|---|---|---|---|---|
CCNHS | 1.043 | 185.6 | 0.689 | 32.77 | 46.78 | 1.43 |
CM-CN | 2.455 | 60.46 | 0.209 | 35.82 | 56.51 | 1.58 |
BCN | 1.470 | 13.12 | 0.081 | 38.67 | 57.45 | 1.48 |
Fig. 3. (a) XRD patterns of the as-prepared samples; (b) solid-state 13C CP-MAS NMR analysis of CM-CN and CCNHS samples; (c) N 1s spectra of CM-CN and CCNHS; (d) EPR spectra of the as-prepared BCN, CM-CN and CCNHS samples.
Fig. 4. (a) UV-vis DRS spectrum of as-prepared samples, the inset at the top right shows the corresponding color of as-prepared samples, the inset at the lower left shows schematic diagram of multiple reflections of light in a hollow spherical structure; (b) time-resolved PL spectra of as-prepared samples; (c) hydrogen evolution reaction (HER) rate with degradation of plasticizer BPA over the as-prepared samples under irradiation for 1 h; (d) wavelength-dependent HER with BPA degradation over CCNHS under monochromatic light irradiation for 1h, the concentration of BPA solution is 10 mg?L-1.
Samples | Components | Lifetime (ns) | Intensity (%) | Δτ (ns) |
---|---|---|---|---|
CM-CN | τ1 | 4.272 | 47.078 | 12.45 |
τ2 | 19.731 | 52.922 | ||
CCNHS | τ1 | 3.581 | 47.506 | 9.68 |
τ2 | 15.207 | 52.494 | ||
BCN | τ1 | 4.554 | 43.029 | 13.89 |
τ2 | 20.944 | 56.971 |
Table 2 Fluorescence decay lifetimes and their percentages of photo-induced carriers in the BCN, CM-CN, and CCNHS samples.
Samples | Components | Lifetime (ns) | Intensity (%) | Δτ (ns) |
---|---|---|---|---|
CM-CN | τ1 | 4.272 | 47.078 | 12.45 |
τ2 | 19.731 | 52.922 | ||
CCNHS | τ1 | 3.581 | 47.506 | 9.68 |
τ2 | 15.207 | 52.494 | ||
BCN | τ1 | 4.554 | 43.029 | 13.89 |
τ2 | 20.944 | 56.971 |
Fig. 5. (a) XRD patterns of TCN and CCNHS samples. The TCN sample shows the typical XRD pattern of triazine-based g-C3N4; (b) FT-IR spectrum of TCN and CCNHS samples; (c) UV-vis DRS spectrum of TCN and CCNHS samples; (d) The estimated band gaps of TCN and CCNHS samples by Kubellka-Munk function.
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