tailieunhanh - Effect of Ag nanoparticle on the photocatalytic activity of TIO2 nanotubes

The TiO2 nanotubes were fabricated by the hydrothermal method. Then, Ag nanoparticles with the varying ratio were attached on the TiO2 nanotubes by photoreduction. The characteristics of structure, morphology, chemical composition and of TiO2 nanotubes modified Ag (Ag-TNTs) was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and the absorption spectral of Methylene blue (MB) solution. The results showed that Ag-TNTs have fairly uniform length with Ag particles immobilized on the tube. | Journal of Science and Technology 54 (1A) (2016) 42-49 EFFECT OF Ag NANOPARTICLE ON THE PHOTOCATALYTIC ACTIVITY OF TIO2 NANOTUBES Thi Ngoc Tu Le1, 2,*, Ngoc Phuong Uyen Tran2, Thi Thu Hang Bui2, Thi Hanh Thu Vu2 1 Dong Thap University, 783 Pham Huu Lau, Ward 6, Cao Lanh City, Dong Thap Province. 2 Faculty of Physics and Engineering Physics, University of Science, Vietnam National University in Ho Chi Minh City, 227 Nguyen Van Cu, Ho Chi Minh City. * Email: ltntu@ Received: 27 October 2015; Accepted for publication: 15 December 2015 ABSTRACT The TiO2 nanotubes were fabricated by the hydrothermal method. Then, Ag nanoparticles with the varying ratio were attached on the TiO2 nanotubes by photoreduction. The characteristics of structure, morphology, chemical composition and of TiO2 nanotubes modified Ag (Ag-TNTs) was investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM), energy dispersive X-ray (EDX) and the absorption spectral of Methylene blue (MB) solution. The results showed that Ag-TNTs have fairly uniform length with Ag particles immobilized on the tube. The photocatalysis TiO2 nanotubes (TNTs) is higher than Ag-TNTs in UV range and lower than AgTNTs in the visible light. And the photocatalytic activity of Ag-TNTs with 5 wt.% Ag is highest in the visible range. Keywords: TiO2, Ag, nanotubes, photocatalyst. 1. INTRODUCTION TiO2 attracted much attention due to its excellent applications in antibacterial treatment, deodorization and water purification, hydrogen production from water splitting reaction photocatalyst, self-cleaning surface systems, treatment of organic contaminants etc. [1 - 4]. Photocatalytic property of TiO2 is determined by the ability of recombination electron-hole pairs. However, TiO2 has a wide bandgap ( eV), thus it only absorbs ultraviolet light (only 5 % of solar radiation reaching the surface of the earth is within the UV range) and electron-hole pairs are easily recombined due to high density