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Abstract
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Photocatalysis serves as an effective and environmentally friendly approach for the treatment of wastewater and water, with
ZnO-based photocatalysts exhibiting significant efficacy in this area. Consequently, we present a novel method that integrates
solvothermal, calcination, and hydrothermal processes to produce a ZnO/Bi2MoO6/AgFeO2 ternary photocatalyst, which
has shown a remarkable photocatalytic activity in eliminating methyl orange (MO), rhodamine B (RhB), and methylene
blue (MB) when exposed to persulfate (
SO5
2⁻) under visible light. The ZnO/Bi2MoO6/AgFeO2 photocatalysts facilitate the
activation of SO5
2⁻ ions, thereby enhancing the degradation of pollutants under visible light exposure. In the presence of
the ZnO/Bi2MoO6/AgFeO2 (20%)/SO5
2⁻ system, MB was entirely decomposed within 75 min, whereas only 39.8% of MB
was eliminated using the ZnO/Bi2MoO6/AgFeO2 (20%) sample without SO5
2⁻. This indicates a synergistic effect between
SO5
2⁻ activation and visible-light photocatalysis in the ZnO/Bi2MoO6/AgFeO2 (20%) system. The enhanced photocatalytic
performance of this system is attributed to the activation of SO52⁻
ions by electrons, leading to the generation of sulfate
radicals (⦁SO4⁻), improved charge carrier separation, and increased visible light absorption by Bi2MoO6
and AgFeO2.
Ultimately,
the proposed mechanism for the significantly enhanced photocatalytic activities involves multiple Z-scheme/type II
heterojunctions. The findings of this study confirm that the ZnO/Bi2MoO6/AgFeO2 system is a viable visible-light-driven
nanocomposite for the purification of water and wastewater.
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