Yanzhou Jiang,Yan Gu,Guangdi Nie,Maoqiang Chi,Zezhou Yang,Ce Wang,Yen Wei,Xiaofeng Lu
In this paper, a novel strategy for the fabrication of reduced graphene oxide (rGO)/Cu 8 S 5 /polypyrrole (PPy) composite nanosheets with Cu 8 S 5 nanoparticles and PPy layer anchored on the surface of rGO as peroxidase-like nanocatalyst is reported. During the synthesis, graphene oxide (GO)/CuO composite nanosheets are prepared first and used as templates, then the sulfuration of CuO and polymerization of pyrrole are accompanied with the reduction of GO, resulting in ternary rGO/Cu 8 S 5 /PPy composite nanosheets. The synthesized Cu 8 S 5 nanoparticles with a diameter in the range from tens to hundreds of nanometers are dispersed within PPy decorated rGO nanosheets. The resultant ternary rGO/Cu 8 S 5 /PPy composite nanosheets exhibit a higher peroxidase-like catalytic activity toward the oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of H 2 O 2 than GO/CuO and rGO/CuS composite nanosheets, revealing a synergistic effect on their activity. The as-prepared rGO/Cu 8 S 5 /PPy platform provides a simple colorimetric approach for the detection of H 2 O 2 and phenol with a high sensitivity. This work offers a new way for the fabrication of rGO-based nanocomposite with superior enzyme-like activity, which displays great potential applications in biocatalysis and environmental monitoring.
Miao Yu,Yuhang Wang,Yihan Liu,Yanxia Wang,Yunfeng Qiu,Zhuo Ma,Youshan Wang,Shaoqin Liu
Solar absorbers play a crucial role in interfacial solar steam generation (ISSG) technology, facilitating efficient steam generation and sterilization. Nonetheless, limitations in solar conversion efficiency and water transport effects, coupled with challenges in outdoor portability of traditional installations, have hindered the progress in steam sterilization technology. In this work, based on Cu8S5/PDA nanoparticles (NPs) and sodium alginate (SA) hydrogel, a solar steam sterilization absorber with superior photothermal conversion and antibacterial properties was developed. The Cu8S5/PDA@SA hydrogel synthesized via in situ deposition demonstrated remarkable full-spectrum absorption performance and stable photothermal conversion ability (37.56%), capable of effectively destroying bacterial structure and metabolic functions through multiple therapeutic mechanisms: photothermal therapy via thermal effect of high temperature and chemodynamic and photodynamic therapies via oxidation of reactive oxygen species and depletion of intracellular glutathione, achieving 100% steam antibacterial efficiency and presenting excellent antibacterial potential under low irradiation conditions. This study proposes a promising avenue for the development of environmentally friendly and easy-to-use solar steam sterilizers for off-grid conditions.
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