Fabrication of Fe-doped TiO2 nanoparticles and investigation of photocatalytic decolorization of reactive red 198 under visible light irradiation

Abstract

In this research, Fe-doped TiO2 nanoparticles with various Fe concentrations (0. 0.1, 1, 5 and 10wt%) were prepared by a sol-gel method. Then, nanoparticles were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray analysis (EDX), BET surface area, photoluminescence (PL) spectroscopy and UV-vis diffuse reflectance spectroscopy (DRS). The photocatalytic activity of the nano-particles was evaluated through degradation of reactive red 198 (RR 198) under UV and visible light irradiations. XRD results revealed that all samples contained only anatase phase. DRS showed that the Fe doping in the titania induced a significant red shift of the absorption edge and then the band gap energy decreased from 3 to 2.1eV. Photocatalytic results indicated that TiO2 had a highest photocatalytic decolorization of the RR 198 under UV irradiation whereas photocatalytic decolorization of the RR 198 under visible irradiation increased in the presence of Fe-doped TiO2 nanoparticles. Among the samples, Fe-1wt% doped TiO2 nanoparticles showed the highest photocatalytic decolorization of RR198 under visible light irradiation.

Synergistic effects of C, N, S, Fe-multidoped TiO2 for photocatalytic degradation of methyl orange dye under UV and visible light irradiations

“…Furthermore, the increase of Fe doping ratio produces negligible enlarged lattice parameters. A slight decrease and angle shift in (101) diffraction peak of TiO 2 might be derived because of the similarity of ionic radius between Fe 3+ and Ti 4+ , proving that Fe 3+ has successfully been doped into the TiO 2 lattice [27] or by the introduction of nonmetal which could inhibit the growth of TiO 2 crystallites. Trevisan et al [28] have proved that N doping with single element does not enhance the photocatalytic performance of TiO 2 as using multi-elements co-doping of C and N. The crystallite sizes of as-prepared samples were calculated by measuring the full width at half maximum of anatase peak using the Scherrer equation (Table 1).…”

Remediación de aguas contaminadas, utilizando dióxido de titanio modificado con hierro como fotocatalizador.

“…Es decir, el agregado de hierro posibilita la absorción de los sólidos en el rango visible del espectro. Esto es debido a la introducción de estados electrónicos entre especies catiónicas de hierro, que se extienden a lo largo de la banda prohibida de la titania pura (Moradi, H., 2016). Adsorción-desorción con nitrógeno.…”

Effective MgO-doped TiO2 nanoaerogel coating for crystalline silicon solar cells improvement

“…The EVA copolymer (Dupont, France) was used as encapsulant for TiO 2 NPs to the solar cell. To determine the best weight ratio (wt%) of EVA to TiO 2 -based NPs that contributes to an optimum enhancement of power conversion efficiency (PCE) in the PV cells, various weight ratios of EVA/p-xylene liquid mixtures (9,12,15,18, and 21 wt%) were previously prepared by dissolving stoichiometric amounts of EVA foils in p-xylene.…”

“…[14][15][16] However, the wide bandgap of TiO 2 (3.2 eV for anatase and 3.0 eV for rutile) restricts the absorption to the UV region. 17 For this reason, a number of approaches have been devised, such as doping with metallic (eg, Fe, Cr, and Mg) [18][19][20] and nonmetallic elements (eg, N and S) 21,22 into the TiO 2 lattice, which could effectively improve the photocatalytic activity of TiO 2 in both UV and visible regions. An alternative strategy is to obtain high surface area of TiO 2 particles with microporous or mesoporous structures because the porous texture on the TiO 2 NPs opens up the possibility for light diffusion on the interface of semiconductor and promotes rapidly the photogenerated-electron transfer to the conduction band of TiO 2 NPs.…”