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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(Left) Representative SEM images of the different Aux/TiO2 photocatalysts and (Right) the EDS elemental analysis of the corresponding area shown in the rectangle on the SEM image.