Investigation of TiO₂ doped with nitrogen and vanadium using hydrothermal/Sol-Gel method and its application for dyes photodegradation

Abstract

The doping process of TiO 2 using a combination method, sol-gel and hydrothermal, has been conducted. The presence of anatase and rutile phase of TiO 2 and doped TiO 2 has been confirmed using UV-DRS, XRD, Raman spectroscopy, and EPR. The Nitrogen-doped TiO 2 (N-TiO 2) showed the highest photoactivity in the powder form than the as-prepared TiO 2 (rutile), anatase and Vanadium-doped TiO 2 (V-TiO 2). The influence of pH during the preparation of N-TiO 2 showed that pH gives a big effect to the morphology and photoactivity of the photocatalyst. The N-TiO 2 at pH 2 showed higher photoactivity than N-TiO 2 at pH 4 and it also showed a fine morphology. The N-TiO 2 also showed the highest photoactivity when it was immobilized in the DPNR matrix. After being immobilized, the photoactivity of the asprepared photocatalyst was decreased to be 0-30%.

Photochemical Synthesis of Lactic Acid Esters at Ambient Temperature Employing Sulfonically Fuctionalized N/W‐Doped Nano‐semiconductor

“…The results show a continuous decrease in the bandgap of the samples with an increase in doping levels for both nitrogen-and tungsten-doped samples (Fig. 5) (37). It was observed that a stable region at 3% nitrogen doping level and 2% tungsten doping level was observed after which no further decrease in bandgap was observed.…”

Effect of the Deposition of Vanadium-Oxide on the Photocatalytic Activity of TiO2 Nanotubes and Its Photodiode Performance Interfaced with CH3NH3PbI3 Single Crystal

“…Figure 7a shows the influence of nanotube After the deposition of vanadium oxide, the photocatalytic properties worsen, regardless of the observed redshift in the UV/VIS spectra (Figure 5). Mahendra et al [40] doped TiO 2 with vanadium hydrothermally and observed that the photocatalytic efficiency worsened compared to undoped TiO 2 , although the band gap for the V-TiO 2 sample was reduced to 1.95 eV. There are two possible reasons for this outcome: the first one is the absence of Ti 3+ on the surface of V-TiO 2 , which can easily react with oxygen to form some radical species and improve photocatalysis; the other one is the presence of bulk vanadium species on the surface of the TiO 2 , which covered the photoactive site.…”

Preparation of S-Doped Tio2 via Sol-Gel/ Hydrothermal Method and Its Activity as Photodegradation of Rb05

“…Absolute ethanol was method that has been described previously. 14 The as-Bruker D8 Advance X-ray icroscopy TM4000 Hitachi for Vis Diffuse Reflectance Spectrophotometry Shimadzu UV-2600 Series t equipped with a condenser to method that has been described as Vis spectrophotometer to determine the doped TiO 2 with the incorporation , no other phase can be found. However, when the anatase.…”