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Microwave synthesis of sulfur‐doped α‐Fe 2 O 3 and testing in photodegradation of methyl orange
Author(s) -
Almazroai Layla S.,
Maliabari Leenah A.
Publication year - 2020
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.202000035
Subject(s) - chemistry , photodegradation , methyl orange , hematite , sulfur , doping , photocatalysis , nanostructure , absorbance , visible spectrum , band gap , photochemistry , analytical chemistry (journal) , nanotechnology , mineralogy , materials science , optoelectronics , organic chemistry , catalysis , chromatography
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.