Evaluation of the photocatalytic activity of iron oxide nanoparticles functionalized with titanium dioxide

Abstract

Abstract. Photocatalytic activity of iron oxide (IO) nanoparticles functionalized with TiO 2 was evaluated through photodegradation of phenol under UV irradiation. For this, magnetic nanoparticles were synthesized by co-precipitation method obtaining aggregates with a size of 46nm. The IO nanoparticles were encapsulated in a polysiloxane matrix and then functionalized with TiO 2 at 25°C (sample A: 0.1g TiO 2 and B: 0.3g TiO 2 ). Photodegradation experiments were carried out for six hours at pH 3.0 using concentrations of IO-TiO 2 nanoparticles of 0.2, 0.5, and 1.0g/L. A maximum amount of 89% of phenol photodegradation was achieved by using 0.2g/L of the IO-TiO 2 -B sample. In addition, it was evaluated the possibility to re-using the nanomaterial after magnetic separation. For this, 0.2g/L of B sample were submitted for five cycles of photodegradation. A stable photocatalytic activity was observed as well as the nanoparticles were regenerated by calcination among cycles, which suggests the versatility of these nanoparticles for the photodegradation of organic pollutants.

Removal of acetylsalicylic acid (ASA) in packed microcolumns with carbon xerogel modified with TiO2 nanoparticles

“…For the modified carbon xerogel (Figure 2c), the micrographs show TiO 2 nanoparticles uniformly distributed on the surface of the material. These results agree with some previous studies, such as those byÁlvarez et al (2015), and Herrera, Reyes and Colina-Márquez (2016), where SEM images exhibit similar morphologies. The XRD technique allows the identification of the phases present in a sample and their degree of crystallinity.…”

Degradation and Loss of Antibacterial Activity of Commercial Amoxicillin with TiO2/WO3-Assisted Solar Photocatalysis

“…As discussed before, the ratio of anatase/rutile of the sample calcined at 700 • C was found to be 74/26, which is very similar to that reported for the commercial TiO 2 Aeroxide P25 (Evonik, Essen, Germany) [28]. Although the surface area of this sample was the lowest of the three materials tested (due to the TiO 2 sintering at higher temperatures), the larger pore diameter seems to compensate this significant drawback of the catalyst.…”

“…Although it was expected to obtain higher reflectance values at higher temperatures, the performance with a calcination temperature of 700 • C shows an intermediate reflectance. As reported in other studies [27,28], this can be related to the ratio of anatase/rutile present in the synthesized material. The calcination temperature can affect the formation of determined crystalline phase and the ratio of these phases [29].…”

Environmental implications and applications of engineered nanoscale magnetite and its hybrid nanocomposites: A review of recent literature

“…A magnetic GO-loaded Cedoped titania (MGO-Ce-TiO2) hybridized composite exhibits good adsorption capacity, high visible-light photoactive and magnetic separability as a novel photocatalyst in the degradation of antibiotic tetracyclines (TC) [188]. Maghemite/magnetite NPs functionalized with TiO2 show up to 89% of phenol photodegradation under UV irradiation [189]. So far most studies have been conducted in simple synthetic aqueous solutions.…”