Novel Heterojunction Bi₂O₃/SrFe₁₂O₁₉ Magnetic Photocatalyst with Highly Enhanced Photocatalytic Activity

Abstract

Magnetic composite photocatalyst Bi2O3/SrFe12O19 was synthesized by hydrolysis with medium temperature sintering method. X-ray diffraction (XRD) investigation revealed that introduction of SrFe12O19 did not change the favorite growth direction of Bi2O3, [121] orientation. Micromorphology study indicated that SrFe12O19 was distributed on the surface of Bi2O3 to possess the best possibility of forming some heterojunction structures. Vibrating sample magnetometer (VSM) measurements manifested the composite possessed better magnetic properties, which was conducive to its separation, recycling, and reuse. Three main reasons for the increase in photocatalytic activity of Bi2O3/SrFe12O19 were (1) the formation of p–n-type heterojunction between p-type Bi2O3 and n-type SrFe12O19 semiconductors, (2) magnetic field effect stemming from magnetic composite itself generated a shunt effect for photoexcited electrons, and (3) as a sensitizer absorbing visible light, SrFe12O19 could help Bi2O3 absorb more incident photons and then produce more photoexcited electron–hole pairs. In addition, this work was expected to provide a simple preparation method for various functional materials, especially magnetic functional materials.

New Insights into Mn1−xZnxFe2O4 via Fabricating Magnetic Photocatalyst Material BiVO4/Mn1−xZnxFe2O4

“…This spectrum of BiVO 4 /Mn 1−x Zn x Fe 2 O 4 (15 wt %) could confirm the coexistence of Mn 1−x Zn x Fe 2 O 4 and BiVO 4 in the prepared composite, which indicated that BiVO 4 /Mn 1−x Zn x Fe 2 O 4 (15 wt %) was prepared successfully. In addition, the absorption patterns at 2341.7 cm −1 and 3433.6 cm −1 were attributed to CO 2 and the surface adsorption H 2 O [9]. …”

“…This prevents it application as a wastewater treatment. Fortunately, a magnetic photocatalyst could solve the above issue [8,9]. The exploitation and application of various magnetic photocatalyst materials have been boosting scientists’ morale.…”

Synthesis of strontium ferrite/iron oxide exchange coupled nano-powders with improved energy product for rare earth free permanent magnet applications

“…7) results confirm that we succeeded in synthesizing core/ shell style (SFO/Fe 3 O 4 ) nano-composite magnets. There have been other successful synthesis approaches to synthesize Sr or Ba hexaferrite/soft magnet composites, [27][28][29] although previous work targeted different applications rather than permanent magnets. Multi-step methods like the one presented here are well suited for synthesizing core/shell structures 14 that allow more control on the morphology and amount of individual phase (hard and soft) needed for producing coupled permanent magnets.…”

Preparation of efficient visible-light-driven BiOBr/Bi2O3 heterojunction composite with enhanced photocatalytic activities

“…The strong peaks at low frequency (about 520 cm À1 and 715 cm À1 ) in both spectra of BiOBr and 75% BiOBr/Bi 2 O 3 are attributed to the BieO vibration of chemical bonds in BiOBr. In the FT-IR spectra of 75% BiOBr/Bi 2 O 3 , the characteristic peak of Bi 2 O 3 at 432.8 cm À1 [28] and the characteristic peak of BiOBr at 520 cm À1 and 715 cm À1 both appear [29], which prove the existence of Bi 2 O 3 and BiOBr in 75% BiOBr/Bi 2 O 3 composites.…”