Formation of CdS quantum dots on zeolitic imidazolate framework-67 dodecahedrons as S-scheme heterojunctions to enhance charge separation and antibacterial activity
文献类型： 外文期刊
作者： Liang, Ruowen 1 ; Yuan, Haoyu 1 ; Wang, Shihui 1 ; Chen, Feng 1 ; Si, Ruiru 3 ; Wu, Ling 2 ; Yan, Guiyang 1 ;
作者机构： 1.Ningde Normal Univ, Fujian Prov Key Lab Featured Mat Biochem Ind, Ningde 352100, Peoples R China
2.Fuzhou Univ, State Key Lab Photocatalysis Energy & Environm, Fuzhou 350002, Peoples R China
3.Inst Qual Stand & Testing Technol Agroprod, Fujian Acad Agr Sci, Fujian Key Lab Agroprod Qual & Safety, Fuzhou 350003, Peoples R China
4.Xiamen Ocean Vocat Coll, Xiamen 361000, Peoples R China
关键词： Zeolitic imidazolate framework-67; CdS quantum dots; Step -scheme; Photocatalysis; Staphylococcus aureus
期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.136； 五年影响因子：8.258 ）
ISSN： 1383-5866
年卷期： 2022 年 303 卷
页码：
收录情况： SCI
摘要： Synthesising a heterojunction structure with a tight interface and sufficient contact area is critical for yielding photogenerated carriers with superior migration efficiencies; however, this remains a significant challenge. Herein, zeolitic imidazolate framework-67 (ZIF-67) was synthesised via four different methods. Using methanol as the medium, the as-prepared ZIF-67 (denoted as ZM) exhibited a uniform morphology and good crystallinity. Subsequently, a well-designed step-scheme (S-scheme) CdS@ZM heterojunction was fabricated via the in-situ coating of CdS quantum dots (QDs) on the ZM dodecahedrons. We utilized the exposed Co centres in the ZM as the "trapping baits" to anchor S2- precursors and yield a highly dispersed CdS QD coating. Owing to the in-situ coating of CdS QDs, the obtained S-scheme CdS@ZM composites exhibited excellent interfacial contacts and uniform morphological distributions. Under visible light irradiation (lambda >= 420 nm), the 40%CdS@ZM heterojunctions displayed an excellent photocatalytic sterilisation rate of 97.6 % within 15 min in the disinfection of Staphylococcus aureus, which was higher than those of pure ZM (51.0 %) and CdS (21.9 %). Finally, the S-scheme charge transfer pathway of CdS@ZM was confirmed using X-ray photoelectron spectroscopy, scanning Kelvin probe microscopy, and electron spin resonance analyses.
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