A SIMPLEROUTE SYNTHESIS OF POLYCRYSTALLINE TiO2-Ag BY THE SONOCHEMICAL METHOD FOR PHOTOCATALYTIC DIRECT BLUE71 DEGRADATION

Abstract

In this paper, silver-doped titania (TiO2-Ag) powders have been synthesized with Ag variants using a simple sonochemical method. The prepared samples were identified using X-ray diffractometry (XRD) and scanning electron microscopy (SEM) to investigate the crystal structure and morphology, respectively. All samples showed the polycrystalline anatase phase and the plane exhibited the (101) dominant orientation. The smallest crystallite sample size of about 14.9 nm was obtained with a 3% Ag doping (TAg3). At higher Ag concentrations, the metal peaks could be detected at 44.3° and 64.4°. SEM images showed that all samples were agglomerated except the TAg3 sample with the lowest surface area of the active sites. Photocatalytic activity was carried out using Direct Blue 71 (DB71) as an organic pollutant. TAg4 exhibited the highest activity under ultraviolet (UV) irradiation with a degradation rate of 0.01 ppm/min. Results suggest that our TiO2-Ag photocatalyst performed well when prepared by a simple sonochemical method.

Formation of Titanium Oxide Nanotube Arrays by Controlling H2o and Time Through Anodic Oxidation

“…Our band gap results for TiO 2 are comparable to those found in the literature, which are around 3.2 eV. [36][37][38] The band gap energy could be influenced by the sectorized presence of a remnant layer. This layer is in contact with the nanotubes of TiO 2 , creating a hetero-bonding of the semiconductor-semiconductor type, altering the energy values.…”

POLYANILINE (PANI)-SENSITIZED Fe3O4/SiO2/TiO2 NANOCOMPOSITES AS PHOTOCATALYST FOR THE REDUCTION OF Au(III) IONS

“…In recent developments, photon-based reactions known as photoreactions have been widely used for the photodegradation of organic matter and photoreduction of cationic metals. [13][14][15][16][17][18][19][20][21][22] Various catalyst materials based on titanium have already been applied for environmental purposes. These include the utilization of bare TiO 2 to reduce Au(II) ions 14 and Au(III) ions 15 waste by UV-light; TiO 2 /Fe 3 O 4 for quinoline photo-degradation by UV light 18 ; and Fe 3 O 4 /SiO 2 /TiO 2 to reduce silver ion 19 and methylene blue photo-degradation by UV-light.…”