Interfacial contact-driven enhanced environmental photocatalysis of CdS-loaded OH-functionalized carbon nanotubes with low biotoxicity
- Authors
- Ju, Hyeon-Ah; Hoang, Dung Thanh; Jang, Woo-Sung; Kim, Young-Hoon; Park, Eun-Byeol; Yang, Sang-Hyeok; Ihm, Kyuwook; Jang, Jae Hyuck; Kim, Young-Min; Lee, 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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