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Adsorption Studies of Nickel(II) Ions onto Amorphous Alumina
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2000, v.13 no.4, pp.433-439
Park,
Y. J., Suh,
M. Y., Park,
K. K., Choi,
K. S., Jee,
K. Y., &
Kim,
W.
H.
(2000). Adsorption Studies of Nickel(II) Ions onto Amorphous Alumina. Analytical Science and Technology, 13(4), 433-439.
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Abstract
Adsorption behaviors of Ni(II) ions were investigated using amorphous alumina as adsorbent. In the adsorption kinetic study, it was observed that Ni(II) ions were bound to the alumina surface in two adsorption stages, the rapid and slow adsorption stages. The rapid adsorption proceeded within 1 hr, thereafter the slow adsorption occurred. The results of adsorption isotherm experiments showed that the Ni(II) adsorption obeyed the Langmuir-Freundlich isotherm, and that the adsorption enhanced with increasing pH. The change in ionic strength did not exhibit a conspicuous trend in Ni(II) adsorption, thereby suggesting that the adsorption occurs through surface complexation rather than electrostatic interactions. The amounts of adsorption were measured with varying pH at three different Ni(II) concentrations under the condition of constant ionic strength, showing that with increasing Ni(II) concentration, the percentage of adsorption decreased and the adsorption edge was shifted to a higher pH value.
- keywords
- nickel, adsorption, kinetics, Langmuir-Freundlich isotherm, adsorption edge, surface complexation
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