Photocatalytic behavior of TiO2 and TiO2/CS nanoparticles under UV irradiation

Abstract

TiO2 nanoparticles and TiO2/CS nanocomposites have been synthesized using the sol-gel method. Characterization by XRD, FTIR, and UV-vis was carried out to determine the structure, size, functional groups, and energy band gap of the synthesized samples. Moreover, the methyl orange (MO) degradation capability of nanoparticles and nanocomposites under ultraviolet light was studied, and the results are described in detail.

The Role of Dual Vacancies in TiO2 for Enhanced Photocatalytic Hydrogen Generation and Pollutants Removal

“…Differently, the corresponding peak of rutile was observed in SV‐Ti as shown by the bule dashed line (PDF#21‐1276) whereas in the other materials with O vacancies (DV‐Ti‐1O to SV‐O) the peak of rutile gradually disappeared with only the anatase phase left, [28] which was attributed to the phase transformation due to the different vacancy types. Meanwhile, the fourier transform infrared reflection (FTIR) spectrum (Figure 1g) showed only the characteristic peaks of anatase TiO 2 were retained in the five materials, [29] and the absorption peaks in the region of 1200 to 1700 cm −1 belonged to water molecules (1632 cm −1 ) indicating that all materials could adsorb water molecules [30] . And the hydroxyl stretching vibration peaks of 3300–3700 cm −1 range in the materials became progressively stronger as the O vacancy enhanced (SV‐Ti to SV‐O), indicating an increasing amount of Ti‐OH [31] .…”

Characteristic of TiO2&Ag0 nanocomposites formed via transformation of metatitanic acid and titanium (IV) isopropoxide

“…Currently, scientists and technologists show increased attention to titanium dioxide nanostructures due to the broad prospects of their practical application as photocatalysts for photocatalytic decomposition of organic dyes [1], gas sensors based on TiO 2 [2], cells for solar energy conversion [3], and also as electrodes for optoelectronic devices [4]. Restricting the use of materials based on TiO 2 in optics and photocatalysis is closely related to the wide band gap of anatase (3.2 eV) and its activity only under UV irradiation [5].…”