Decolorization and Removal of Reactive Red 198 by Nano-Magnetic Graphene Oxide Publisher



Ghadim EE¹ ; Lamei N^{2, 3} ; Panahyab A¹ ; Hatefi M⁴ ; Abdi K^{2, 3}
Source: Asian Journal of Chemistry Published:2017

Abstract

In this research, a systematic study of the adsorption and decolorization process of reactive red 198 (RR198) onto Fe3O4-graphene oxide (Fe3O4-GO) was applied via various pH, sorption time and temperature. Investigation of reactive red 198 adsorption kinetics were satisfied by the pseudo-first and second order model. According to the kinetic examinations, the equilibrium reached within 15 min following the pseudo-second-order model. The sorption data have interpreted by the Langmuir model with the maximum adsorption of 357.14 mg g-1 at 298 K and a rate constant of R2 = 0.996. The mean energy of adsorption and thermodynamic parameters such as ΔH°, ΔS° and ΔG° values were determined which included the exothermic and spontaneous nature of the sorption process. The results indicated, reactive red 198 vigorously was adsorbed on the Fe3O4-GO surface via π-π interaction and cation-π bonding acid under UV Irradiation could degrade the reactive red 198 strongly and within 60 min the reactive red 198 totally disappeared. © 2017, Chemical Publishing Co. All rights reserved.