A promising Ag 2 CrO 4 /LaFeO 3 heterojunction photocatalyst applied to photo-Fenton degradation of RhB

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Ye, Y
Yang, H
Zhang, H
Jiang, J
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2020
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Abstract

Ag 2 CrO 4 nanoparticles (10–35 nm) were assembled onto LaFeO 3 nanoparticles (20–60 nm) via a facile chemical precipitation method to form novel Ag 2 CrO 4 –LaFeO 3 heterojunction composite photocatalysts. The prepared Ag 2 CrO 4 –LaFeO 3 composites were characterized by XRD, SEM, TEM, XPS, BET, UV-vis DRS, PL spectroscopy and EIS and photocurrent response. The TEM result clearly shows that Ag 2 CrO 4 particles are decorated onto LaFeO 3 particles to form Ag 2 CrO 4 –LaFeO 3 heterojunction. Compared to bare LaFeO 3 , the 10%Ag 2 CrO 4 -LaFeO 3 composite exhibits a slightly increased BET specific surface area, increased photocurrent density, decreased charge-transfer resistance and decreased PL emission peaks. Using simulated sunlight as the light source and in the presence of H 2 O 2 , the photo-Fenton performance of the composite photocatalysts toward the degradation of RhB was investigated, revealing that they manifest significantly enhanced photo-Fenton degradation of RhB when compared with bare LaFeO 3 and Ag 2 CrO 4 . Among the composite photocatalysts, 10%Ag 2 CrO 4 –LaFeO 3 exhibits the highest photo-Fenton activity, which is about 3.1 and 2.5 times higher than that of bare LaFeO 3 and Ag 2 CrO 4 , respectively. This is attributed to the fact that the composite photocatalysts have highly efficient separation of photogenerated electron–hole pairs due to the formation of Ag 2 CrO 4 –LaFeO 3 heterojunctions. Active species trapping experiments and ·OH detection experiments were carried out, from which it is concluded that ·OH radicals are the dominant reactive species causing the dye degradation. A synergistic mechanism was proposed to elucidate the enhanced photo-Fenton activity of Ag 2 CrO 4 –LaFeO 3 heterojunction composites.

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Environmental Technology (United Kingdom)

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Environmental sciences

Biological sciences

Engineering

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