J. Mater. Sci. Technol. ›› 2020, Vol. 56: 206-215.DOI: 10.1016/j.jmst.2020.03.034
• Research Article • Previous Articles Next Articles
Dongran Qin, Yang Xia, Qin Li*(), Chao Yang, Yanmin Qin, Kangle Lv
Received:
2020-03-17
Revised:
2020-03-27
Accepted:
2020-03-29
Published:
2020-11-01
Online:
2020-11-20
Contact:
Qin Li
Dongran Qin, Yang Xia, Qin Li, Chao Yang, Yanmin Qin, Kangle Lv. One-pot calcination synthesis of Cd0.5Zn0.5S/g-C3N4 photocatalyst with a step-scheme heterojunction structure[J]. J. Mater. Sci. Technol., 2020, 56: 206-215.
Fig. 3. XRD patterns (a), FT-IR spectra (b), TGA curves (c), and Nitrogen adsorption-desorption isotherms and corresponding pore-size distribution curves (inset) (d) of blank CN, CZS, and CZS/CN composites.
Sample | SBET (m2 g-1) | Vpore (cm3 g-1) | Average pore size (nm) | RhB degradationrate constan (×10-2 min-1) |
---|---|---|---|---|
CZS | 12 | 0.10 | 34.4 | 0.20 |
CZS/CN-1 | 24 | 0.19 | 31.4 | 3.27 |
CZS/CN-2 | 35 | 0.21 | 24.1 | 8.17 |
CZS/CN-4 | 19 | 0.12 | 26.8 | 1.94 |
CZS/CN-5 | 14 | 0.10 | 27.3 | 1.36 |
CN | 17 | 0.14 | 33.5 | 0.61 |
Table 1 Physical and chemical properties of the prepared photocatalysts.
Sample | SBET (m2 g-1) | Vpore (cm3 g-1) | Average pore size (nm) | RhB degradationrate constan (×10-2 min-1) |
---|---|---|---|---|
CZS | 12 | 0.10 | 34.4 | 0.20 |
CZS/CN-1 | 24 | 0.19 | 31.4 | 3.27 |
CZS/CN-2 | 35 | 0.21 | 24.1 | 8.17 |
CZS/CN-4 | 19 | 0.12 | 26.8 | 1.94 |
CZS/CN-5 | 14 | 0.10 | 27.3 | 1.36 |
CN | 17 | 0.14 | 33.5 | 0.61 |
Fig. 5. Comparison of the photocatalytic RhB degradation profiles over the prepared samples (a) and the corresponding degradation rate constants under the pseudo-first-order kinetics model (b).
Fig. 6. (a) XPS survey spectra of the CZS, CN and CZS/CN-2 samples. High-resolution XPS spectra of C 1s (b), N 1s (c), and Cd 3d (d) of CN and CZS before and after the combination.
Fig. 7. Schematic illustrations for g-C3N4 and Cd0.5Zn0.5S semiconductors with staggered band configurations before (a) and after (b) contact; IEF is the abbreviation of interfacial electric field.
Fig. 8. (a) Effects of different scavengers on the photocatalytic degradation of RhB over the CZS/CN-2 sample. DMPO spin‐trapping ESR spectra of the CZS/CN-2 sample for O2·- (b) and O·H (c) radicals.
Fig. 9. (a) DRS spectra of the prepared samples, (b) Tauc plots of CZS and CN, (c) Mott-Schottky plots of the CZS and CN samples at fixed frequency of 1000 Hz in 0.4 M Na2SO4 (pH = 5.45).
Fig. 10. Possible photocatalysis mechanisms of the CZS/CN heterojunction with (left) S-scheme charge transfer route and (right) type II charge transfer route; IEF is the abbreviation of internal electric field.
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