Synthesis of Bi₂₅FeO₄₀ Nanoparticles with Oxygen Vacancies via Ball Milling for Fenton Oxidation of Tetracycline Hydrochloride and Reduction of Cr(VI)

Abstract

Though heterogeneous Fenton-like reactions possess various characteristics such as a wide application range and mild reaction conditions, their reactivity is currently restricted by unsatisfactory H2O2 decomposition efficiency and low pH adaptation. Hence, Bi25FeO40 nanoparticles prepared via the mechanical ball-milling method (Bi25FeO40-B) with extensive oxygen vacancies possess high reactive oxygen species production performance by enhancing the H2O2 decomposition for tetracycline hydrochloride oxidation and Cr(VI) reduction. H2O2 decomposition efficiency can reach 55.3% in the presence of the Bi25FeO40-B catalyst, which is much higher than that of Bi25FeO40 prepared by the traditional hydrothermal method (23.8%). The Bi25FeO40-B/H2O2 heterogeneous Fenton system demonstrates efficient performance for simultaneous oxidation of tetracycline hydrochloride (TCH) and reduction of Cr(VI). It is capable of removing 75.2% of 50 mg/L TCH and 93.0% of 20 mg/L Cr(VI) at pHinitial = 7, respectively. Abundant oxygen vacancies on the surface of Bi25FeO40-B nanoparticles due to the nanometer size effect can accelerate the decomposition of H2O2 to promote the formation of reactive oxygen species for removing the target organic pollutants and reduction of Cr(VI). Consequently, this work provides a strategy for the preparation of oxygen-rich Bi25FeO40 catalysts for efficient degradation of contaminants and depicts the bright future of Fe-based metal oxides with oxygen vacancies on H2O2 activation in Fenton-like reactions.

Natural Clay-Modified Piezocatalytic Membrane for Efficient Removal of Coliform Bacteria from Wastewater

“…It has been found from microstructural visualization (Figure e) that oxygen vacancies have been created in the lattice structure, which may have arisen owing to the high-energy ball milling of the bulk kaolinite . These oxygen vacancies further result in active sites for the incorporation of functional groups over its surfaces.…”

Constructing an efficient electrocatalyst for water oxidation: an Fe-doped CoO/Co catalyst enabled by in situ MOF growth and a solvent-free strategy

“…Finally, ZIF-67/Co was directly transformed into Fe-CoO/Co due to the weak acidity of FeSO 4 and high energy introduced by ball-milling. 35 The entire synthesis process was solvent-free except for the small amount of water and ethanol used during the catalyst washing.…”

Fabricating freestanding electrocatalyst with bismuth‐iron dual active sites for efficient ammonia synthesis in neutral media

“…The high-resolution TEM (HRTEM) and corresponding selective area electron diffraction (SAED) pattern of the BiFeO scratched down from BiFeO/FCC are shown in Figure 2D and the inset, from which the regular crystal lattice fringes with a lattice spacing of 0.316 nm agree well with the (310) plane of Bi 25 FeO 40 , indicating the crystalline BiFeO nanoparticles are successfully loaded onto the surface of FCC. 58 The discrete sports in SAED indicate the monocrystalline nature of BiFeO. The SEM image and corresponding elemental mapping (Figure 2E) are adopted to investigate the component of the freestanding BiFeO/FCC catalyst.…”