Abstract
In this work, N-doped carbon-coated ZnS with a sulfur-vacancy defect (ZnS@N-C) was performed for the visible-light-driven photodegradation of tetracycline hydrochloride (TCH). The obtained ZnS@N-C exhibited enhanced photocatalytic activity compared with ZnS for TCH removal. Among these ZnS@N-C composites, ZnS@N-C-3 with N-doped content of 3.01% (100 nm) presented the best visible-light photocatalytic activity and superior long-term photocatalytic stability after five cycle times for TCH removal in the visible light region. This may be ascribed to the interface between the N-doped carbon shell and ZnS with a sulfur-vacancy defect for efficient charge transfer and the restrained recombination of charge carriers. Electron spin resonance (ESR) results indicate that the ·O2‒ radical plays a crucial role in the enhanced photocatalytic activity of ZnS@N-C-3.
Highlights
Photocatalysis, as a potential route to relieving environmental and energy issues, has been intensively applied for pollutant degradation [1,2,3,4], water splitting [5,6,7], and solar energy conversion [8,9,10,11]
This work focuses on the synthesis of ZnS with an N-doped carbon coating (ZnS@N-C) and its sulfur-vacancy effect on visible-light photocatalytic activity for the removal of tetracycline hydrochloride (TCH)
ZnS with a sulfur-vacancy defect (ZnS@N-C) nanoparticles were synthesized by a hydrothermal route
Summary
Photocatalysis, as a potential route to relieving environmental and energy issues, has been intensively applied for pollutant degradation [1,2,3,4], water splitting [5,6,7], and solar energy conversion [8,9,10,11]. This work focuses on the synthesis of ZnS with an N-doped carbon coating (ZnS@N-C) and its sulfur-vacancy effect on visible-light photocatalytic activity for the removal of tetracycline hydrochloride (TCH) Reported photocatalysts such as CuInS2/Mg(OH)2 [35], ZnIn2S4/BiPO4 [36], AgBr/Bi2WO6 [37], BiOI/g-C3N4/CeO2 [38], and TiO2/BiOCl [39] are efficient heterojunctions for the visible-light-driven degradation of TCH. From these compositions, N-doped carbon serves as the electron capture, facilitating the separation of electron-hole pairs. The sulfur-vacancy defect and N-doped carbon of ZnS@N-C is designed to enhance the charge transfer and electron-hole separation and extend the light sorption toward the visible light region
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