Magnetic composite BiOCl–SrFe₁₂O₁₉: a novel p–n type heterojunction with enhanced photocatalytic activity

Abstract

The magnetic composite BiOCl-SrFe12O19, a novel p-n type heterojunction was synthesized by hydrolysis with a medium temperature sintering method. The microstructure and magnetic properties of the prepared material were characterized by FTIR, XRD, SEM, TEM, HRTEM, SAED, and VSM. The results showed the [001] facet of BiOCl with high photocatalytic activity was exposed in the BiOCl-SrFe12O19. The heterostructured BiOCl-SrFe12O19 had better magnetic properties, contributing to its reuse and improvement in photocatalysis. Moreover, the composite was blessed with excellent photocatalytic activity and stability. In the BiOCl-SrFe12O19 system, SrFe12O19 not only inhibited the growth of BiOCl along the [001] direction to enhance the exposure of the [001] wafer, but also acted as a sensitizer absorbing light irradiation. The magnetic field generated from SrFe12O19 made BiOCl, under light irradiation, produce more photo-induced electrons and holes and simultaneously hampered their recombination. For the first time we propose the possible mechanism of how to enhance photocatalytic activity by a magnetic field effect originating from the magnetic photocatalyst itself.

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 and visible light responsive photocatalytic activity of Fe3O4/Ni-Al-Ce LDH/Bi2WO6 composites

“…In addition, the first-order reaction rate equations are shown in Table 2, indicating that the photocatalytic process of MO decolorization conforms to first-order kinetics. 38,39 From Table 2, we find that the reaction rate constant decreased as the methyl orange concentration increased. As is well-know, physical interpretation of reaction rate constant is reaction rate of unit concentration (1 mol L -1 ).…”

Bismoclite (BiOCl) in the San Francisco de los Andes Bi–Cu–Au Deposit, Argentina. First Occurrence of a Bismuth Oxychloride in a Magmatic–Hydrothermal Breccia Pipe and Its Usefulness as an Indicator Phase in Mineral Exploration

“…By means of FTIR spectroscopy, they recorded the sharpest absorption bands of pure BiOCl at 529, 524, 535 and 523 cm´1, respectively, and a weak peak at approximately 1650 cm´1 (Table 8). Chang et al (2014) and Xie et al (2014) [71,72] reported a broad, weak absorption at 3450 cm´1 (Table 8). Ye et al (2012) [69] and Bai et al (2014) [70] published IR spectrums up to 2000 cm´1 and documented a minor peak at 1395 cm´1 (Table 8).…”

“…The [69][70][71][72]. By means of FTIR spectroscopy, they recorded the sharpest absorption bands of pure BiOCl at 529, 524, 535 and 523 cm´1, respectively, and a weak peak at approximately 1650 cm´1 (Table 8).…”