1. Nickel Recovery from Aqueous Solution Using Crab Shell Particles
- Author
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Kuppusamy Vijayaraghavan, Joseph Raj Jegan, Kandasamy Palanivelu, and Manickam Velan
- Subjects
Physical and theoretical chemistry ,QD450-801 - Abstract
The potential use of crab shell as a sorbent for the removal of nickel(II) ions from aqueous solution was investigated. The binding of nickel ions by crab shell was found to be affected significantly by pH, with the maximum sorption capacity being observed at pH 4.5. The sorption isotherm was well represented using the Freundlich model. Nickel(II) ion removal by crab shell was mainly influenced by the removal of calcium carbonate, proteins and chitin, indicating the importance of these components in nickel ion binding. Co-ions such as Cu 2+ , Co 2+ , Cd 2+ , Zn 2+ and Mg 2+ affected the Ni(II) ion removal efficiency of crab shell. The biosorbed Ni(II) ions were effectively eluted by various mineral acids, EDTA solutions and NH 4 OH. Of these, the sodium salt of EDTA (0.01 M) in NH 4 OH appeared to be the best eluant, being capable of desorbing more than 99% of the sequestered Ni(II) ions with insignificant damage to the shell particles. The biosorbent could be regenerated and re-used in five sorption—elution cycles.
- Published
- 2005
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