Synthesis and characterization of V-doped TiO 2 nanoparticles through polyol method with enhanced photocatalytic activit
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Synthesis and characterization of V-doped TiO2 nanoparticles through polyol method with enhanced photocatalytic activities Khaled Belfaa1 · Mohamed Saber Lassoued1 · Salah Ammar1 · Abdellatif Gadri1 Received: 26 January 2018 / Accepted: 10 April 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract This work reports the synthesis of vanadium-doped titanuim dioxide nanoparticles using titanium chloride and ethylene glycol as precursor and solvent respectively. The properties of as-prepared samples were investigated by X-ray diffractometry, scaning electron microscopy, Fourier transform infrared (FTIR) spectroscopy, diffuse reflectance, and thermal analysis. X-ray diffraction patterns indicate that the T iO2 nanoparticles obtained after calcination at 500 °C under air atmosphere has the anatase phase with a tetragonal structure and the crystallite sizes were in the range 16.83–12.27 nm. The transmission electron microscopy was used to detect the morphology of synthesized nanoparticles. The functional groups present in the samples were identified by FTIR study. From the optical studies, there is a blue shift in the absorption edge for our samples that can be attributed to the presence of V in the TiO2. For V doped TiO2 nanoparticles the optical band gap varies between 3.18 and 2.60 eV with the increase of V concentration. The TGA findings allow the thermal cycle determination of samples whereas DTA findings allow the phase transition temperature identification. Finally, the evaluation of the photocatalytic activity is carried out using methyl blue as model of chemical pollutants in UV irradiation conditions and followed satisfactory the pseudo first order according to the Langmuir–Hinshelwood model.
1 Introduction Titanium dioxide ( TiO2) has attracted significant attention from researchers because of the lot interesting physical and chemical properties. It has high corrosion resistance and chemical stability, biological inertness, non-toxic as well as its low cost. These properties make it suitable for a variety of applications, tradionnaly such as pigments, cosmetic then more recently according to photo generation of electron hole as photocatalysts, as particles for solar cells and as coating with self-cleaning properties [1–6]. From point of view of structural properties, Titanium dioxide has three types of crystal forms, which are brookite, anatase and rutile. By increasing the temperature, the amorphous phase convert to the anatase phase then transformed irreversibly to rutile phase. It has been previously reported that anatase to rutile transformation in synthetic TiO2 usually occurs * Khaled Belfaa [email protected] 1
Unité de Recherche Electrochimie, Matériaux et Environnement UREME (UR17ES45), Faculté des Sciences de Gabès, Université de Gabès, Cité Erriadh, 6072 Gabès, Tunisia
at a temperature of 600–700 °C. Brookite crystallizes in orthorhombic structure [7]. It is unstable phase, so it has no industrial value, while the colloidal phase preparation methods for
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