Investigation of magnetic properties and photocatalytic performance of Fe3O4 nano particles after coating with ZnO and TiO2

Subject Areas :

سولماز قنبرنژاد ¹ ( دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران، گروه مهندسی مواد، تهران، ایران )
علی نعمتی ² ( دانشگاه صنعتی شریف، دانشکده مهندسی و علم مواد، تهران، ایران )
سعید باغشاهی ³ ( دانشگاه بین المللی امام خمینی (ره)، گروه مهندسی مواد، قزوین، ایران )
محبوبه محمودی ⁴ ( دانشگاه آزاد اسلامی واحد یزد، دانشکده مهندسی پزشکی، یزد، ایران )

Received: 2018-01-12 Accepted : 2018-09-13 Published : 2019-02-20

Keywords: nanoparticles, Photocatalyst, semiconductor, Binary core/shell, Ternary core/shell,

Abstract :

In this research, magnetite NPs via sol/gel method was coated with ZnO and TiO2. Phases, microstructures, and magnetic properties of binary and ternary core/shell nanoparticles were characterized using X-ray diffraction )XRD), transmission electron microscopy )TEM) and vibrational magnetometer )VSM). Photocatalytic activities in methylene blue degradation under sunlight irradiation for 120 min were recorded using UV/Vis spectrophotometer, changes were studied using the photoluminescence spectrum (PL), and the specific surface areas were obtained by the nitrogen adsorption/desorption apparatus )BET). The results showed that 10 mg/ml core/shell nanoparticles during 120 min under sunlight radiation could degrade >90% of methylene blue molecules. However, the increase in the number of shells causes the change in the type of semiconductors from direct to indirect; following that heterogeneous interface reduces the photocatalytic efficiency

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