Constructing Ag decorated ZnS1-x quantum dots/Ta2O5-x nanospheres for boosted tetracycline removal: Synergetic effects of structural defects, S-scheme heterojunction, and plasmonic effects

[Display omitted] •Ag decorated S-scheme ZnS1-x QDs/Ta2O5-x composites were constructed.•Remarkably enhanced visible-light absorption and photocatalysis.•S-scheme heterostructures, structural defects, and plasmonic effects contribute to charge separation.•Suggested degradation pathways and mechanism...

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Vydané v:Journal of colloid and interface science Ročník 623; s. 1085 - 1100
Hlavní autori: Liu, Jing, Ma, Min, Yu, Xin, Xin, Changhui, Li, Mingxue, Li, Shijie
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Elsevier Inc 01.10.2022
Predmet:
Composites
Defects
light
microparticles
nanospheres
photocatalysis
photoreduction
Ta2O5
tetracycline
toxicity
Visible-light photocatalysis
Composites
Visible-light photocatalysis
Ta2O5
Defects
ISSN:0021-9797, 1095-7103
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Shrnutí:[Display omitted] •Ag decorated S-scheme ZnS1-x QDs/Ta2O5-x composites were constructed.•Remarkably enhanced visible-light absorption and photocatalysis.•S-scheme heterostructures, structural defects, and plasmonic effects contribute to charge separation.•Suggested degradation pathways and mechanism. Constructing S-scheme charge transfer pathways is often considered to be an efficient strategy for boosting interfacial charge separation for high-performance photocatalysis, especially for ultrawide bandgap tantalum-based semiconductors. In this work, defects-mediated S-scheme ZnS1-x quantum dots (QDs)/Ta2O5-x composites decorated with Ag were prepared by the modified solvothermal and photoreduction methods and employed for visible-light photocatalytic toxic tetracycline degradation. Compared with commercial Ta2O5, pristine Ta2O5-x microspheres, and ZnS1-x QDs, the prepared Ag/ZnS1-x/Ta2O5-x-1.0% composite showed the highest visible-light photocatalytic performance, and the corresponding reaction rate constant reached as high as approximately 0.02605 min−1, which was 5.97 times of ZnS1-x QDs, 2.63 times of Ta2O5-x, and far better than that of commercial Ta2O5. The main reactive species, photocatalytic mechanism and degradation pathways were also studied. The highly enhanced photocatalytic performance of the Ag/ZnS1-x quantum dots/Ta2O5-x composites could be mainly attributed to the formation of Ag modified S-scheme heterostructures and highly increased surface areas. Current work indicates a high-performance tantalum-based composite for dealing with persistent organic pollutants.
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content type line 23
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2022.05.079