Removal of nickel (II) ions aqueous solution using phosphoric acid modified y-zeolites.
2010
P. Panneerselvam | S. Sivanesan | Norhashimah Morad
The sorptive removal of nickel ions from aqueous solution using modified H-Y zeolite was investigated large pore of H-Y zeolite was modified with phosphoric acid by wet method. The modified zeolite was converted to Na+ form using aqueous NaHCO3, solution. The Na+ form of modified zeolite, represented as PNa2 -Y was characterized by XRD (X-ray Diffraction), BET (surface area), SEM (Scanning Electron Microscope), and AAS (Atomic Absorption Spectrophotometer) techniques, It was the tested for adsorption with aqueous Ni(SO)4, solution. Th Ni2+ content of the solution was analyzed by AAS. Phosphoric acid modified PNa,-Y zeolite shows higher adsorption capacity than the parent H-Y zeolite. Equilibrium modelling data has a better fit to linear Langmuir model compared to the Freundlich model. The kinetic data was represented by pseudo-first order and pseudo-second order kinetic models The thermodynamic parameters such as change in free energy (AG'), enthalpy (AH'), and entropy AS')were also calculated. These parameters confirmed that the sorption of Ni2+ is feasible, spontaneous and endothermic.
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