I n t e r n a t i o n a l J o u r n a l o f W a s t e R e s o u r c e s ISSN: 2252-5211 International Journal of Waste Resources OPEN ACCESS Freely available online Research Article 1 Int J Waste Resour, Vol. 10 Iss. 4 No: 385 Facile Synthesis and Characterization of rGO Decorated NiFe 2 O 4 Nano- composite Obtained from Waste Ni-Cd/Ni-MH Batteries Mylarappa M 1 *, Venkata Lakshmi V 2 , Kantharaju S 1 1 Department of Chemistry, Sri Jagadguru Renukacharya College of Science, Arts and Commerce, Bangaluru-560009, Karnataka, India; 2 Research Centre, Department of Chemistry, AMC Engineering College, Bengaluru-560083, Karnataka, India ABSTRACT The present study revealed the NiFe 2 O 4 /rGO composite synthesized from Ni-Cd/Ni-MH spent by hydrothermal method. The obtained NiFe 2 O 4 nano particles was dispersed effectively on reduced graphene oxide and the obtained composite was subjected to X-Ray powder diffraction (XRD) to know the particle crystallinity, size and structural aspects. The nano sized NiFe 2 O 4 and NiFe 2 O 4 /rGO nano composite were exposed to study the surface particle morphology by using Field emission Scanning Electron Microscopy (FESEM). The elements present in the sample was analyzed by using Energy Dispersive X-Ray analysis (EDX), the functional groups identification was done by Fourier Transform Infrared Spectrometer (FTIR) and the thermal stability was studies by using Thermogravimetry analysis. Keywords: Waste battery; NiFe 2 O 4 ; NiFe 2 O 4 /rGO; Characterization; Thermal analysis *Corresponding to: Mylarappa M, Department of Chemistry, Sri Jagadguru Renukacharya College of Science, Arts and Commerce, Bangaluru-560009, Karnataka, India, Tel: +91-9742413751; E-mail: mylu4mkallihatti@gmail.com Received: July 25, 2020; Accepted: August 27, 2020; Published: September 03, 2020 Citation: Mylarappa M, Venkata Lakshmi V, Kantharaju S (2020) Facile Synthesis and Characterization of rGO Decorated NiFe 2 O 4 Nano- composite Obtained from Waste Ni-Cd/Ni-MH Batteries, Int J Waste Resour 10: 385. doi: 10.35248/2252-5211.20.10.385. Copyright: 2020 © Mylarappa M, et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. INTRODUCTION Nickel ferrite (NiFe 2 O 4 ) nanocrystalline is one of the most vital ferrites among alternative ferrites from the spent battery because of most favorable uses in Ferro fluids, gas sensors, storage devices, catalysts and microwave devices [1-7]. Recently, extensive consideration has been paid on NiFe 2 O 4 with variable size, morphology and shape as well analogous applications were studied [8,9]. In the synthesis of NiFe 2 O 4 , both chemical and physical methods have been established with different surface morphology. Compared to physical methods, the chemical methods have benefits such as large scale production, low cost and reaction taking place at very low temperature. The nano structured NiFe 2 O 4 has been prepared by different process like sonochemical, polymeric precursor, mechanical alloying, hydrothermal, and co-precipitation methods [10-14]. The literature shows that a few works on the surface morphology controlled preparation of the NiFe 2 O 4 nano particles. Newly, fabricated NiFe 2 O 4 nano sheets using chemical method by Gunjakar et al. [15]. Chu et al. synthesized nano cubes and nanorods of NiFe 2 O 4 through hydrothermal process [16]. Zhang et al. via polyethylene glycol method prepared NiFe 2 O 4 nano particles [17], the hollow sphere NiFe 2 O 4 nano rods and their magnetic properties was studied by Chen L et al. [18]. Also several studies have concentrated on the synthesis of spinel nano ferrites because of their quantum confinement effects, both chemical and physical properties and their surface effects. The nano NiFe 2 O 4 have AB 2 O 4 structure. In this structure, O specifies the oxygen anion site and A and B shows tetrahedral and octahedral cation sites [19]. The nickel ions (Ni +2 ) are located in B sites and iron ions (Fe 3+ ) are equally dispersed between A and B sites. It is well known that combined metal oxide nano particles are seemly very attractive to making the electrode materials due to their controlling morphology and size, high surface energy, attractive structural, magnetic and electronic activities, which improve their catalytic performance [20-22]. In the synthesis of nano NiFe 2 O 4, reduced graphene oxide (rGO) was selected as solid subsidiary material to keep the nano NiFe 2 O 4 from aggregation. The rGO based nano composite materials will have increased electrochemical performance like reversibility, capacitive action and cycling stability. The rGO doped nano composite have been widely used as anodes for rechargeable batteries and some recent studies shows the production of rGO based metal- oxide anode materials have equitably good development [23,24]. For example, MgFe 2 O 4 /rGO composites was displayed excellent cycling stability and rate capability synthesized by Zhang et al. and SnO 2 /rGO nano hybrid exhibited that electrochemical Na-storage