Abstract
Magnetically separable Fe3O4/AgBr hybrid materials with highly efficient photocatalytic activity were prepared by the precipitation method. All of them exhibited much higher photocatalytic activity than the pure AgBr in photodegradation of methyl orange (MO) under visible light irradiation. When the loading amount of Fe3O4 was 0.5 %, the hybrid materials displayed the highest photocatalytic activity, and the degradation yield of MO reached 85 % within 12 min. Silver halide often suffers serious photo-corrosion, while the stability of the Fe3O4/AgBr hybrid materials improved apparently than the pure AgBr. Furthermore, depositing Fe3O4 onto the surface of AgBr could facilitate the electron transfer and thereby leading to the elevated photocatalytic activity. The morphology, phase structure, and optical properties of the composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–visible diffuse reflectance spectra (UV–vis DRS), and photoluminescence (PL) techniques.
Highlights
Up to now, most of the silver oxide and silver halide have attracted much attention because of their strong visible light absorption performance [1,2,3,4,5,6,7]
The EDS spectrum of Fe3O4/AgBr-0.5 hybrid materials indicates that the atomic ratio of Fe and Ag is approximately 1:134, which is a little larger than the designed value
The PL intensity of the Fe3O4/AgBr-0.5 sample was the lowest, which indicated that the separation efficiency of charge carriers was Conclusions Fe3O4/AgBr hybrid materials with high photocatalytic efficiency under visible light were prepared through the precipitation method
Summary
Most of the silver oxide and silver halide have attracted much attention because of their strong visible light absorption performance [1,2,3,4,5,6,7]. AgBr, which has a band gap of 2.6 eV, is well known as a photosensitive material and has been extensively applied to photographic films, which demonstrated excellent performance in degradation of dye pollutants and decomposition of water [8,9,10]. Immobilizing catalysts on magnetic substrates by feasible methods is proven to be an effective approach for removing and recycling particles [18,19,20,21]. The Ag halides such as AgBr and AgI are photoactive to visible light. When they were immobilized on SiO2@Fe3O4 magnetic supports, they exhibited faster degradation rates for 4-chlorophenol than N-TiO2 [23]. The Ag halides were photoreduced and losed their stability quickly
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