چكيده به لاتين
In this study, high surface area CoFe2O4 nanoparticles were synthesized by solution combustion method. The as-combusted magnetic CoFe2O4 were used as adsorbent for the removal of cadmium in industrial wastewater. Several effective parameters in synthesis of CoFe2O4 nanoparticles like pH of starting solution, effect of cobalt nitrate and cobalte acetate precursors and effect of three fuels (glycine, urea, and citric acid) were investigated in various fuel to oxidant ratios. The synthised powder were characterised by FTIR, DTA/TGA, XRD, SEM, TEM, BET, and VSM. XRD results indicated that the prepared CoFe2O4 powder is almost pure. Surface area measurements done with BET method, demonstrated the decrement of surface area by increase of both pH from 2 to 10 and fuel to oxidant molar ratio. The powder obtained with use of glycine has higher surface area due to the released gaseous products. Studying the effect of contact time in removal of cadmium ion from aqueous solutions showed that the kinetic of adsorption process fit to pseudo- second order model. The adsorption isotherms were well fitted on Freundlich model. The as-combusted CoFe2O4 powders at =0.75 exhibited excellent adsorption capacity (694 mg g-1) and high adsorption rate, due to their high specific surface area (185 m2/g) and pore volume (1.28 cm3/g).
Keywords: CoFe2O4, solution combustion synthesis, Cd (II), pseudo- second order model, Freundlich adsorbtion isotherm
