Preparation and characterization of nanocomposite material based on tio2-ag for environmental applications

Catalina Nutescu Duduman1, Jose Maria G mez de Salazar y Caso de Los Cobos2, Maria Harja1, Maria I. Barrena P rez2, Consuelo G mez de Castro3, Doina Lutic4, Olga Kotova5, Igor Cretescu6

1 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Chemical Engineering Department, 73 Prof.dr.doc. Dimitrie Mangeron Street, 700050 Iasi, Romania
2 Complutense University of Madrid, Faculty of Chemical, Department of Materials Science and Metallurgical Engineering Av. Seneca, 2, 28040 Madrid, Spain
3 Complutense University of Madrid, Faculty of Chemical, Department of Materials and Chemical Engineering, Av. S neca, 2, 28040 Madrid, Spain
4 Alexandru Ioan Cuza University of Iasi, Blvd. Carol I No 11, 700506 Iasi, Romania
5 Laboratory of Mineral Raw Materials Technology, Institute of Geology, Komi Science Center, Ural Branch of RAS, Syktyvkar, Komi Republic, Russia
6 Gheorghe Asachi Technical University of Iasi, Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 73 Prof.dr.doc. Dimitrie Mangeron Street, 700050 Iasi, Romania

Abstract


A simple and efficient method for preparing Ag-doped TiO2 nanoparticles was successfully developed, by associating the sol-gel method and the impregnation-reduction. While titanium dioxide is one of the most used solids as photocatalyst, silver is particularly interesting for applications in biological and chemical detection and for its antibacterial properties. Moreover, in photocatalysis silver acts as an electron sink and donor in capturing the photogenerated electrons. The structural and morphological properties of the TiO2-Ag samples were investigated by XRD, SEM, TEM, SAED and EDAX. The crystallinity degree increased by calcination at 650 C and the nature of the phases changed from anatase to a mixture of anatase, rutile and silver in metallic form and silver oxide. The photocatalytic properties of the synthesized product were evaluated in the UV-assisted photodegradation of Rhodamine 6G and Methyl Blue dyes. The photocatalytic performance in dyes decomposition of the doped samples was better than pure TiO2.

Keywords


nanocomposite; photocatalyst; silver; titanium dioxide

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