Magnetic Ag2S/Ag/CoFe1.95Sm0.05O4 Z-scheme Heterojunction: Preparation and Its Photocatalytic Degradation Property

doi:10.15541/jim20220166

Abstract

Abstract:

Photocatalytic degradation of organic pollutants from water bodies can efficiently reduce the organic pollutants in wastewater, which has broad application prospects. In this study, using CoFe_1.95Sm_0.05O₄as a support, the Z-scheme heterojunction Ag₂S/Ag/CoFe_1.95Sm_0.05O₄was synthesized through a facile in situ deposition method followed by photo-reduction. Microstructure, phase structure, optical and magnetic properties of the samples were analyzed. Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ composite exhibited the highest catalytic activity, which dynamic constant (k) was 1.96, 2.71 and 7.24 times higher than those of Ag₂S/Ag, Ag₂S and CoFe_1.95Sm_0.05O₄, respectively. Introduction of CoFe_1.95Sm_0.05O₄ could efﬁciently promote the separation efﬁciency of photogenerated charge carriers in Ag₂S/Ag. And •O₂^-and •OH^- were proved to be the main active substances in the photocatalytic process. In addition, the as-prepared Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ composite could be quickly separated from the solution by an extra magnetic field after the photocatalytic reaction. Cyclic photodegradation test showed that the Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ hybrid materials had the stable degradation ability and crystal structures in the photodegradation process. This research provides a useful approach to develop photocatalysts with high efficiency, narrow band gap and magnetism.

Key words: Ag₂S/Ag/CoFe_1.95Sm_0.05O₄, Z-scheme heterojunction, photocatalytic degradation, recycling

CLC Number:

TB333

CHEN Shikun, WANG Chuchu, CHEN Ye, LI Li, PAN Lu, WEN Guilin. Magnetic Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ Z-scheme Heterojunction: Preparation and Its Photocatalytic Degradation Property[J]. Journal of Inorganic Materials, 2022, 37(12): 1329-1336.

Figures/Tables 7

Fig. 1 XRD patterns of different samples (a) and EDS pattern of Ag2S/Ag/CoFe1.95Sm0.05O4 (b)

Fig. 2 TEM (a) and HRTEM (b,c) images of Ag2S/Ag/CoFe1.95Sm0.05O4

Fig. 3 XPS survey spectra of different materials (a); Ag3d(b); S2p(c); Co2p (d); Fe2p(e); Sm3d (f) and O2p (g) XPS spectra of Ag2S/Ag/CoFe1.95Sm0.05O4

Fig. 4 UV-Vis absorption spectra (a) and plots of (αhν)2 versus hv (b) of samples

Fig. 5 Degradation curves of MO by different samples under visible light irradiation (a, c) and corresponding first-order kinetics (b, d)

Fig. 6 Magnetization curves of samples with inset showing the pictures of the solution after magnetic separation using an external magnetic (a), five cycling runs of the sample for MO degradation (b) and XRD patterns of Ag2S/Ag/CoFe1.95Sm0.05O4 before and after cyclic test (c)

Fig. 7 Photocatalytic degradation of Ag2S/Ag/CoFe1.95Sm0.05O4 by free radical capture (a), Mott-Schottky curves of samples (b), Valence-band XPS spectra of Ag2S, CoFe1.95Sm0.05O4 (c,d), EIS spectra of as-prepared samples (e), and the proposed photocatalytic degradation mechanism of MO over Ag2S/Ag/CoFe1.95Sm0.05O4(f)

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Magnetic Ag₂S/Ag/CoFe_1.95Sm_0.05O₄ Z-scheme Heterojunction: Preparation and Its Photocatalytic Degradation Property

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