J. Mater. Sci. Technol. ›› 2022, Vol. 112: 49-58.DOI: 10.1016/j.jmst.2021.09.054
• Research Article • Previous Articles Next Articles
Olga Saccoa, Paola Francob, Iolanda De Marcob, Vincenzo Vaianob,*(), Emanuela Callonec, Riccardo Ceccatoc, Francesco Parrinoc,**()
Received:
2021-07-15
Revised:
2021-09-03
Accepted:
2021-09-20
Published:
2021-12-12
Online:
2021-12-12
Contact:
Vincenzo Vaiano,Francesco Parrino
About author:
** Francesco Parrino, University of Trento, Via Sommarive 9, 30123 Trento, Italy. E-mail addresses: francesco.parrino@unitn.it (F. Par-rino).Olga Sacco, Paola Franco, Iolanda De Marco, Vincenzo Vaiano, Emanuela Callone, Riccardo Ceccato, Francesco Parrino. Photocatalytic activity of Eu-doped ZnO prepared by supercritical antisolvent precipitation route: When defects become virtues[J]. J. Mater. Sci. Technol., 2022, 112: 49-58.
Fig. 1. FESEM images of (a) unprocessed ZnAc (before calcination), (b) unprocessed EuAc (before calcination), (c) SAS-precipitated ZnAc (before calcination), (d) SAS-produced ZnO (after calcination), (e) SAS-precipitated EuAc-ZnAc 60/1 w/w (Eu/Zn molar ratio equal to 1) (before calcination), (f) SAS Eu-doped ZnO at molar ratio percentage Eu/Zn equal to 1 (after calcination).
Samples | a (Å) | c (Å) | D (nm) | SSA (m2/g) |
---|---|---|---|---|
ZnO | 3.2535±2 | 5.2126±2 | 80.4 ± 0.2 | 12±0.1 |
0.83EuZn | 3.2528±4 | 5.2100±5 | 39.1 ± 0.5 | 16±0.1 |
1EuZn | 3.2515±4 | 5.2098±4 | 31.9 ± 0.4 | 18±0.1 |
1.5EuZn | 3.2523±4 | 5.2101±7 | 32.1 ± 0.4 | 15±0.1 |
Table 1. Lattice parameters (a and c), mean crystallites dimension (D), and Specific Surface Area (SSA) of the samples.
Samples | a (Å) | c (Å) | D (nm) | SSA (m2/g) |
---|---|---|---|---|
ZnO | 3.2535±2 | 5.2126±2 | 80.4 ± 0.2 | 12±0.1 |
0.83EuZn | 3.2528±4 | 5.2100±5 | 39.1 ± 0.5 | 16±0.1 |
1EuZn | 3.2515±4 | 5.2098±4 | 31.9 ± 0.4 | 18±0.1 |
1.5EuZn | 3.2523±4 | 5.2101±7 | 32.1 ± 0.4 | 15±0.1 |
Sample | Ebg (eV) | EFB (V) |
---|---|---|
ZnO | 3.17 | -0.11 |
0.83EuZn | 3.20 | -0.11 |
1EuZn | 3.185 | -0.11 |
1.5EuZn | 3.182 | -0.11 |
Table 2. Flat potential (EFB) and band gap values (Ebg) of the samples.
Sample | Ebg (eV) | EFB (V) |
---|---|---|
ZnO | 3.17 | -0.11 |
0.83EuZn | 3.20 | -0.11 |
1EuZn | 3.185 | -0.11 |
1.5EuZn | 3.182 | -0.11 |
Fig. 6. (a) PL excitation (left spectrum, λem = 616 nm) and emission (right spectrum, λexc = 466 nm) spectra of bare ZnO (black lines), 0.8EuZn (red lines), 1.0EuZn (green lines), and 1.5EuZn (blue lines) samples; (b) PL emission spectra of bare and Eu3+ doped ZnO samples. λexc = 355 nm.
Fig. 7. CV discoloration (a) and mineralization (b) as a function of irradiation time for SAS-produced ZnO and Eu-doped ZnO photocatalysts at different Eu content.
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