Fabrication of nitrogen doped TiO2/Fe2O3 nanostructures for photocatalytic oxidation of methanol based wastewater

Abstract

An important industrial process that often occurs on the surface of a heterogeneous catalyst using thermochemical or photochemical could help in the oxidation of methanol-based wastewater to formaldehyde. Titania-based photocatalysts have drawn a lot of interest from scientists because they are a reliable and affordable catalyst material for photocatalytic oxidation processes in the presence of light energy. In this study, a straight-forward hydrothermal method for producing n-TiO2@α-Fe2O3 composite photocatalysts and hematite (α-Fe2O3) nanocubes has been done. By adjusting the ratio of n-TiO2 in the prepared composite photocatalysts, the enhancing influence of the nitrogen-doped titania on the photocatalytic characteristics of the prepared materials was investigated. The prepared materials were thoroughly characterized using common physiochemical methods, such as transmission electron microscope (TEM), scanning electron microscope (SEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX), X-ray photoelectrons spectroscopy (XPS), physisorption (BET), and others, in order to learn more about the structure The results obtained showed that nitrogen-doped titania outperforms non-doped titania for methanol photooxidation. The addition of nitrogen-doped titania to their surfaces resulted in an even greater improvement in the photooxidation rates of the methanol coupled with hematite. The photooxidation of methanol in the aqueous solution to simulate its concentration in the wastewater has been occurred. After 3 h, the four weight percent of n-TiO2@α-Fe2O3 photocatalyst showed the highest rate of HCHO production.

Advancements in Doping Strategies for Enhanced Photocatalysts and Adsorbents in Environmental Remediation

“…The solvothermal synthesis of nitrogen-doped TiO 2 and Fe 2 O 3 nanocomposites yielded photocatalysts with enhanced activity owing to the formation of a heterojunction between nitrogen-doped TiO 2 and Fe 2 O 3 . The nanocomposite absorbed light at a higher rate compared to the TiO 2 alone and resulted in the nearly complete oxidation of methanol [65] Solvent-based multi-doping strategies had also been explored, aiming to enhance the optoelectronic properties of TiO 2 . These strategies involve doping TiO 2 with non-metals (nitrogen, carbon, and sulphur) and metals (e.g., iron) using the sol-gel synthesis method.…”

Maximizing Bio-Hydrogen and Energy Yields Obtained in a Self-Fermented Anaerobic Bioreactor by Screening of Different Sewage Sludge Pretreatment Methods

“…Thermal pretreatment is helpful for the growth of hydrogen-producing bacteria after suppressing the activity of methanogens [29]; however, in the chemical treatment processes that were treated by acetylene, iodopropane, methanol and bromo ethane sulfonic acid (BESA), these served as inhibitors and very toxic for bacteria [30]. Some researchers have demonstrated that alkaline pretreatment methods outperform acidic pretreatment techniques as a pretreatment method for anaerobic sludge [31].…”

Enhancing methyl orange discoloration with TiO2/Fe2O3/AC composites: synergistic adsorption-photocatalysis

“…Numerous studies have shown that the deposition of Fe 2 O 3 on TiO 2 nanoparticles improved the absorption of visible light and the photocatalytic activity for the breakdown of organic pollutants in aqueous solution [19]. Photogenerated electron-hole pairs could be separated more easily if the Fermi energy levels of TiO 2 and Fe 2 O 3 aligned and an internal electric field was created hence increasing the photocatalytic performance [26].…”