Phospholipid-derived Au and Au–Cu suspensions as efficient peroxide and borohydride activators for organic molecules degradation: Performance and sustainable catalytic mechanism
- Authors
- Kalidhasan, Sethu; Lim, Yeon-Su; Chu, Eun-Ae; Choi, Jonghoon; Lee, Hee-Young
- Issue Date
- Jan-2024
- Publisher
- Elsevier Ltd
- Keywords
- Degradation; Gold–Copper NPs; Redox catalyst; Soy lecithin
- Citation
- Chemosphere, v.346
- Journal Title
- Chemosphere
- Volume
- 346
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/68833
- DOI
- 10.1016/j.chemosphere.2023.140567
- ISSN
- 0045-6535
1879-1298
- Abstract
- In the contemporary context, executing light-oxidant- and reductant-driven reactions in solution-phase processes remains challenging mainly due to the lack of general tools for understanding the reactive potential of nano-functional catalysts. In this study, dual-active nanometals (Au and Cu doped with Au) capped within soy lecithin (SL), were developed and characterized, combining flexibility with the catalytic advantages and stability of liquid-phase catalysts. The as-synthesized SL-Au (LG) and SL-Au-Cu (LGC) catalysts were efficiently degraded rhodamine B (RB, 100%) in the presence of H2O2 under light irradiation (350 W lamp) at wide pH range (3–7) within 4.5 h and p-nitrophenol (p-NP, >90% degradation at pH 7) in the presence of NaBH4 under normal stirring with slower kinetics (∼72 h). RB degradation followed a pseudo-second-order kinetic model with a higher r2, and p-NP degradation followed first-order kinetics. The active sites embedded within the structural order of SL arrangement displayed elevated catalytic activity, which was further enhanced by the movement of intermediate/excited states and charged elements within the metal suspended in the phospholipid (LG and LGC). The self-regulating tunability of the physicochemical characteristics of these catalysts provides a convenient and generalizable platform for the transformation of modern dual-active (redox) catalysts into dynamic homogeneous equivalents. © 2023 Elsevier Ltd
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