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Interfacial contact-driven enhanced environmental photocatalysis of CdS-loaded OH-functionalized carbon nanotubes with low biotoxicity

Authors
Ju, Hyeon-AhHoang, Dung ThanhJang, Woo-SungKim, Young-HoonPark, Eun-ByeolYang, Sang-HyeokIhm, KyuwookJang, Jae HyuckKim, Young-MinLee, Hangil
Issue Date
Jan-2025
Publisher
ELSEVIER
Keywords
CNT-OH/CdS; Interfacial contact engineering; Defect structures; Photocatalytic degradation; Eco-friendly photocatalyst
Citation
APPLIED SURFACE SCIENCE, v.679
Journal Title
APPLIED SURFACE SCIENCE
Volume
679
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/160502
DOI
10.1016/j.apsusc.2024.161197
ISSN
0169-4332
1873-5584
Abstract
CdS is a promising visible-light-driven photocatalyst, but it is highly toxic. Therefore, exploring alternatives that minimize toxicity while maintaining its photocatalytic properties is crucial. Carbon allotropes have been suggested as eco-friendly scaffolds for making high-performance photocatalysts with a small amount of toxic but visible light-responsive CdS additive to reduce environmental risk. However, it is unclear how small amounts of CdS in the nanocomposite can avoid a threat to environmental safety, and the role of surface functional groups on the physical interfaces for photocatalysis has not been sufficiently elucidated. Here, we used OH-functionalized carbon nanotubes (CNT-OH) as a support for CdS nanoparticles (NPs) and investigated the effect of CdS loading on photocatalytic activity and toxicity. Comprehensive microscopy coupled with machine learning-assisted spectroscopy revealed that electronic structure alterations occur uniquely at heterojunctions where CdS NPs contact CNT-OH, uncovering them as being catalytically active. Notably, the CNT-OH loaded by only 3 wt% CdS NPs resulted in a highly enhanced photocatalytic activity comparable to pure CdS NPs for selective oxidation of 2,5-hydroxymethylfurfural and degradation of 4-chlorophenol. These findings provide insight into heterocontact engineering using visible light-responsive catalysts and functionalized platforms to develop environmentally benign photocatalysts with high performance.
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