FABRICATION OF Fe1-xZnxFe2O4 NANO PARTICLES AND STUDY ON THEIR KINETIC AND ISOTHERMAL MODELS FOR ADSORPTION OF DIRECT RED 79

Abstract

Substitution of Zn into the FeFe2O4 spinel structure was achieved via the co-precipitation method. The
introduction of Zn cations into FeFe2O4 resulted in the formation of ZnxFe1-xFe2O4 (x: 0-1) with a random
distribution, impacting the adsorption capability towards Direct Red 79 dye, particularly notable at x=0.4.
The optimal nanomaterial sample exhibited a specific surface area of 161.5 m2
/g, a pore volume of
approximately 0.281 cm3
/g, and a particle size of 10 nm, synthesized via sudden nucleation at high
temperatures. XRD and Raman analyses confirmed the formation of a single crystalline phase. Notably, the
highest efficiency of Direct Red 79 adsorption occurred at pH 3. The adsorption process adhered to the
pseudo-second-order kinetic model and Langmuir isotherm, with a maximum adsorption capacity of 56.85
mg/g at 298K.