The Accumulation of Zn(II) Ions onto Haro River Sand from Aqueous Solutions

The accumulation of Zn(II) ions onto Haro river sand has been studied using radiotracer ( (,5 Zn) and batch techniques, optimizing nature and composition of electrolyte, concentration of Zn(ll) ions (2.34x10" 5 -9.38x10~4M), amount of sand (10-2000 mg), shaking time (1-90 min) and temperature (15-55°C) to achieve maximum sorption (-78%).The sorption data follow Freundlich and Dubinin-Radushkevich (D-R) isotherms.Freundlich parameters 1/n = 0.39±0.03and C m = 0.3610.11mmole g~' and D-R constants ß=-0.0031210.00027kJ 2 mole" 2 and X m =54il0 μηιοίε g" 1 and E=12.6+0.5 kJ mole"' have been estimated.The values of ΔΗ=48.812.3 kJ mole" 1 , AS=-174.5±7.7 J mole" 1 K" 1 and AG=-3.3±0.2 kJ mole" 1 at 298 Κ have been evaluated.Among the ions tested, ascorbate, tartrate, oxalate, citrate, Pb(ll), Y(lll) and Al(lll) reduce the sorption (3-25%), whereas Zr(lV) and Cr(IIl) enhance the sorption significantly.Cd(II), Cr(lll), 1(1) and Ce(III) have low sorption.This cheaper material appears to have potential applications in analytical separation/preconcentration, in industrial effluent treatment and in water purification.

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