Microwave synthesis of sulfur‐doped α‐Fe₂O₃ and testing in photodegradation of methyl orange

Abstract

α-Fe 2 O 3 , as a promising photocatalyst in environmental aspects, was doped by a nonmetal to enhance the optical and electronic properties. Sulfur-doped hematite was synthesized by microwave irradiation. The samples were investigated by X-ray diffraction and energy dispersive X-ray-scanning electron microscopy. Nanostructure particles have a hexagonal structure that did not change after sulfur incorporation. The optical studies via UV-Visible spectroscopy proved the high absorbance of S/α-Fe 2 O 3 under the visible region. Moreover, the band gap of S/α-Fe 2 O 3 was shifted to higher wavelengths. However, nonmetals may exhibit a negative effect and act as recombination centers as the photoactivity of undoped hematite was still higher in the photodegradation of methyl orange as a pollutant. H 2 O 2 as an oxidant was fourfold better than O 2 , leading to the formation of the active oxygen species. The preparation method plays a crucial role in the shaping of nanostructure particles and its photoactivity.

High Performance Photorechargeable Li‐Ion Batteries Based on Nanoporous Fe2O3 Photocathodes

“…[32] Due to its direct bandgap in the visible spectra (2.0-2.5 eV), the 𝛼-Fe 2 O 3 is explored for various optoelectronic applications such as solar water splitting, electron transport layers (ETL) for solar cells, and photodetectors. [33][34][35][36] All these properties of 𝛼-Fe 2 O 3 make it a suitable active material for PRB application. We report the fabrication of highly nanoporous 𝛼-Fe 2 O 3 photocathodes using multi-walled carbon nanotubes (MWCNTs) and PCBM as conducting carbon additives for electron transport and demonstrated their use for high performance Li-PRB.…”

Thermal conductivity enhancement for CuO nanoflakes in oil‐based and oil blend‐based nanofluids

“…Nanofluids are a colloidal suspension of nanoparticles with a size of 1-100 nm dispersed in base fluids, which may be water, oil, ethylene glycol, and other organic liquids. [12][13][14][15][16] Nanofluids are exploited in various applications such as the cooling performance of smart and advanced computer devices, damping and sealing, removal of ions, thermal energy storage, biomedical applications, and renewable energy applications. [17][18][19][20][21] Applications of nanofluids in drug delivery, polymerase chain reaction, cancer treatment, and antibacterial activity are concluded by Thakur et al [22] One of the important areas of application of nanofluids is heat transfer.…”