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Ag-ZnO catalysts for UV-photodegradation of methylene blue |
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| Authors: | Murray J Height Sotiris E Pratsinis Okorn Mekasuwandumrong Piyasan Praserthdam |
| Affiliation: | aParticle Technology Laboratory, Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology, ETH Zürich, Sonneggstrasse 3, ML2 F13, CH-8092 Zürich, Switzerland bDepartment of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhonpathom, Thailand cCentre of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand |
| Abstract: | High surface area Ag-ZnO catalysts have been made by flame spray pyrolysis (FSP) and characterized by X-ray diffraction (XRD), nitrogen adsorption, UV–vis spectroscopy and electron microscopy (SEM and transmission electron microscopy (TEM)) combined with energy dispersive X-ray spectroscopy (EDXS) for elemental mapping. Silver metal clusters deposited directly on ZnO nanocrystals were obtained from this process. The Ag loading (1–5 at.%) controlled the Ag cluster size from 5 to 25 nm but did not influence the ZnO crystal size. Photodegradation of 10 ppm methylene blue (MB) solution was used to evaluate the performance of these FSP-made Ag-ZnO and was compared to wet-made Ag-ZnO and reference titania photocatalysts. The rate of photodegradation was optimal for Ag loading around 3 at.%. The best photocatalytic performance was exhibited by flame-made Ag-ZnO produced at the longest high-temperature residence times having high crystallinity as determined by XRD and UV–vis. |
| Keywords: | Silver Zinc oxide Flame spray pyrolysis Methylene blue Reaction kinetics |
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