Synthesis and Characterization of Ti-Fe Oxide Nanomaterials: Adsorption-Degradation of Methyl Orange Dye

摘要

Organic solvent-free impregnation method was used to synthesize titanium-iron oxides (TIOs) nanomaterial. The physical properties of synthesized TIOs materials were characterized by XRD, SEM-EDX, BET, UV-Vis, and FTIR analytical techniques. The appearance of iron oxide (IO) on SEM image, XRD, and EDX spectra, the redshift on UV-Vis spectra of TIO compared to titanium oxide (TO), and intensity reduction in FTIR spectra proves the good impregnation of IO in TO lattice. The Langmuir and Dubinin-Radushkevich adsorption isotherm test in the dark show the domination of physical adsorption. Furthermore, the Flory-Huggins isotherm model that has ΔG = −11.40 kJ/mol and Fowler-Guggenheim model that has w = −106.5 kJ/mol confirm the spontaneity of the reaction and the presence of adsorbate-adsorbate repulsive interaction, respectively. The passing of the linear Weber-Morris intraparticle adsorption-diffusion plot through the origin and well-fitting of its coefficient of determination (R~2) value relative to pseudo-first-order indicates the domination of adsorption-diffusion mechanism. On the methyl orange degradation experiment, as the percentage of IO increases from 4 to 12, its degradation efficiency decreases, i.e., TIO with 4% calcined at 500 °C (TIO-4) has higher degradation efficiency with k values of 0.03025.