Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 613, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2020.126115
Keywords
Laser ablation in liquid; Water-ethanol solutions; Stability of nanoparticle colloids; 4-Nitrophenol hydrogenation; CuOx colloids
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Colloidal nanoparticle catalysts play a crucial role in industrial processes and fundamental studies, with laser ablation in liquid (LAL) being a promising method for preparing nanoparticle colloids. The use of mixed solutions can lead to stable colloids with potential applications in catalysis.
Colloidal nanoparticle catalysts play a decisive role both in the implementation of a number of important industrial processes, including the hydrogenation of nitro compounds, and in fundamental studies of catalytic reactions on nanoparticles. The laser ablation in liquid (LAL) is a promising method to prepare nanoparticle colloids, and the use of mixed solutions as a medium can be attractive for both preparation of stable colloids and their application in catalysis. While using the LA in water-ethanol solutions, the stable colloids of CuOx NPs demonstrating high catalytic activity in the 4-nitrophenol (4-NP) hydrogenation were prepared. The reasons for the instability of colloids obtained in water and alcohol as well as the stabilization of colloids in water-ethanol solutions were considered. The results obtained contribute to the understanding of the lower catalytic activity of the studied CuOx catalyst in ethanol and other non-aqueous solvents. The presence of ethanol in the reaction medium was found to have an inhibitory effect on the 4-NP reduction kinetics due to the alcohol adsorption on the catalyst surface that is well described within the framework of the Langmuir-Hinshelwood model.
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