Efficiency estimative and characterization of nickel ferrite nanoparticles produced by sol-gel modified by ICR cross-linked technique

This paper describes nickel ferrite (NiFe2O4) synthesis by sol-gel modified by Ionic Coordination Reaction (ICR) cross-linked technique according to nitrate concentration on organic based solution, aiming a reduction in losses associated to production process. Chitosan is used to increase the coordination between the ions along with chelate agent glutaraldehyde, used to form the gel in sol-gel technique. Calcination process was also applied, with temperature of 1100 degrees C, 10 degrees C/min step for 10 h, to eliminate organic composes and obtain NiFe2O4 with particles over 300 nm diameter. The obtained efficiency results show that A03 (120 g/L) sample has better final efficiency between the proposed concentrations, reaching a 57.39% value with 95.86% purity, estimated by XRD and EDS. SEM was also performed, and confirmed size distribution based on XRD results, presenting homogeneous morphology along with narrow particle size distribution. (C) 2019 Elsevier B.V. All rights reserved.