The effect of titanium dioxide synthesis technique and its photocatalytic degradation of organic dye pollutants

Abstract

Nanostructured mesoporous titanium dioxide (TiO2) particles with high specific surface area and average crystallite domain sizes within 2 nm and 30 nm have been prepared via the sol-gel and hydrothermal procedures. The characteristics of produced nanoparticles have been tested using X-Ray Diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area analysis, Scanning Electron Microscopy (SEM), Fourier Transform Infra-Red (FTIR), and Raman Spectroscopy as a function of temperature for their microstructural, porosity, morphological, structural and absorption properties. The as-synthesized TiO2 nanostructures were attempted as catalysts in Rhodamine B and Sudan III dyes' photocatalytic decomposition in a batch reactor with the assistance of Ultra Violet (UV) light. The results show that for catalysts calcined at 300 °C, ∼100 % decomposition of Sudan III dye was observed when Hydrothermal based catalyst was used whiles ∼94 % decomposition of Rhodamine B dye was observed using the sol-gel based catalysts. These synthesized TiO2 nanoparticles have promising potential applications in the light aided decomposition of a wide range of dye pollutants.

Influence of Re and Ru doping on the structural, optical and photocatalytic properties of nanocrystalline TiO2

“…Comparison with other TiO 2 -based photocatalysts should be made with caution because not only is the literature extensive, but the conditions under which the photodegradation assays are carried out are quite different in both photocatalyst/organic compound concentrations and irradiation conditions. Nevertheless, our results shows that all the synthesized samples offer better photocatalytic performance for the studied reactions than the commercial Degussa P25 TiO 2 [79,80], nanostructured TiO 2 [81] and TiO 2 modified by post-treatment with phosphorous acid [79]. In particular, Ru-doped TiO 2 seems to be a very promising photocatalyst, with a photocatalytic performance being seemingly better than other TiO 2 -based materials such as Fe-doped TiO 2 [80] and C-N-S tridoped TiO 2 [82] or even than the more complex Table 2 Apparent first-order rate constants and half-life values of both RhB and phenol photodegradation reactions using the different synthesized nanoparticles as photocatalysts…”

Boosting of Antibacterial Performance of Cellulose Based Paper Sheet via TiO2 Nanoparticles

“…Peaks at 2θ = 27.36° (110) and 2θ = 53.91° (110) indicate the rutile form [ 30 ]. The percentage of the phases was calculated in accordance to Spurr and Meyers equations [ 30 , 31 , 32 ]: X A (%) = 100/(1 + 1.265 I R /I A ) X R (%) = 100/(1 + 0.8 I A /I R ) where X A and X R are the percentage weight of anatase and rutile, respectively, I A is the intensity of anatase phase at 2θ = 25.26°, and I R is the intensity of rutile phase at 2θ = 27.36°.…”

Fabrication and Characterization of N−TiO2/C/ATP Composite with Enhanced Visible‐Light Photocatalytic Performance for the Degradation of Polyacrylamide in Wastewater

“…When the pH value is less than 6.25, the catalyst surface is positively charged, and when the pH value is greater than 6.25, it is negatively charged. Due to the adsorption of PAM by the catalyst will be affected by the surface charge properties of TiO 2 , which will affect the effect of photocatalytic degradation . The high acidity in the solution makes TiO 2 positively charged, which is beneficial to adsorb photo‐generated electrons on the catalyst surface and generate superoxide radicals with oxygen and inhibit the recombination of electrons and holes, and the anionic PAM is negatively charged, which is easy to attract TiO 2 with positive charge to improve the activity of the catalyst.…”