Abstract
Interactions of graphene calcium ferrite nano (GCF) composite have been investigated for the utilization as adsorbent for fluoride in aqueous medium. Batch adsorption studies were carried out with various fluoride concentrations, amount of adsorbent, pH, agitation time and temperature. The adsorption process was strongly influenced by the pH of the solution. The extent of adsorption decreased from 79.5 to 70.1% by changing the initial fluoride concentration from 1.0 to 9.0 mg L− 1 (for adsorbent load 2.0 g L− 1). The kinetic study of the interaction was tested with pseudo first order Lagergren equation, second order kinetics, Elovich equation, liquid film diffusion model and intra particle diffusion model; however the interaction was much more close to the second order kinetics (k2 = 0.0518 g mg− 1min− 1at 303 K). The adsorption data gave good fits with Langmuir monolayer capacity of ̴11.90 mg g−1 at 303 K. The uptake of fluoride was also preferred by higher solution temperature. The results established good potentiality for graphene calcium ferrite nano (GCF) composite to take up and separate fluoride from aqueous medium through adsorption-mediated immobilization.