J Nanostruct 8(4): 408-416, Autumn 2018 RESEARCH PAPER Simple Preparation of Magnetic, Antibacterial and Photo-catalyst NiFe 2 O 4 @TiO 2 /Pt Nanocomposites Gholamreza Nabiyouni 1,2, *, Davood Ghanbari 3 1 Department of Physics, Faculty of Science, Arak University, Arak, Iran 2 Institute of Nanoscience and Nanotechnology, Arak University, Arak, Iran 3 Department of Science, Arak University of Technology, Arak, Iran * Corresponding Author Email: g-nabiyouni@araku.ac.ir ARTICLE INFO Article History: Received 10 July 2018 Accepted 21 September 2018 Published 01 October 2018 Keywords: Magnetic Magnetic Nanocomposite Nanostructures Photo-Catalyst ABSTRACT How to cite this article Nabiyouni G, Ghanbari D. Simple Preparation of Magnetic, Antibacterial and Photo-catalyst NiFe 2 O 4 @TiO 2 /Pt Nanocomposites. J Nanostruct, 2018; 8(4): 408-416. DOI: 10.22052/JNS.2018.04.011 Firstly nickel ferrite nanoparticles were synthesized via a simple precipitation method. Ten mono-disperse platinum nanoparticles and NiFe 2 O 4 @TiO 2 /Pt nanocomposites were synthesized by a facile sol-gel procedure. Te structure, phase and crystallite size of the magnetic and photo-catalyst products were characterized by X-ray difraction pattern (XRD). Te morphology and size of the nanostructures were surveyed by scanning electron microscopy (SEM). Te purity of the samples was confrmed by Fourier transform infrared (FT-IR) spectroscopy. Vibrating sample magnetometer (VSM) illustrated that nickel ferrite nanoparticles have super paramagnetic behaviour. Te photo catalytic behaviour of NiFe 2 O 4 @TiO 2 /Pt nanocomposites was approved using the fast degradation of two various azo dyes under visible and ultra violet light irradiation. Te results show that nanocomposites have feasible magnetic feature for easy separation and efective photo catalytic properties for purifcation of organic dye contaminants. Te antibacterial behaviour of NiFe 2 O 4 @TiO 2 / Pt nanocomposites was evaluated using degradation of E coli bacteria. INTRODUCTION Nickel ferrite (NiFe 2 O 4 ) is an inverse spinel that the cubic unit cell is formed by 56 atoms, 32 oxygen anions dispersed in a cubic close packed structure. It is a kind of sof magnetc materials with many merits, such as abundant source, low price, high electrical resistance, chemical and mechanical stability and widely used in high dense magnetc recording media, magnetc fuids and high frequency equipment [1-3]. Platnum nanopartcles can absorb visible light due to their localized surface plasmon resonance (LSPR). When the frequency of the light satsfes the resonance conditons of the platnum nanopartcles, the LSPR occurs with the associated light absorpton. Platnum nanopartcles can also work as an electron trap and actve reacton sites. It was explored the applicability of plasmonic processes in the feld of photocatalytc chemistry for toxic organic decompositon. Simultaneous of LSPs other efects such as optcal near-feld enhancement, heat generaton and excitaton of hot-electrons occur. The composites of semiconductor nanopartcles and optcally actve metallic nanostructures show suitable applicaton in comparison to conventonal photocatalysts. The main feature of these photocatalysts is that the interacton between semiconductor and metallic building blocks results in very efcient conversion of incident photons into electron-hole pairs in the semiconductor [4-12]. In this work NiFe 2 O 4 nanopartcles were Tis work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.