Studies in Adsorption of Some Toxic Metal Ions on Citrus sinensis Skin and Coffea arabica Husk: Agricultural Byproduct

Abstract

Adsorption of toxic metal ions like Hg²⁺, Pb²⁺ and transition metal Zn²⁺ ion on different agricultural byproducts were measured by UV-visible spectrophotometer-108. Adsorption of metal ions follows the order polymerized Citrus sinensis (mosambi) skin> Coffea arabica (coffee) husk for Hg²⁺ and Pb²⁺ and Citrus sinensis skin
< Coffea arabica husk for Zn²⁺ metal ion. Citrus sinensis skin
showed maximum adsorbing capacity for Hg²⁺ and Pb²⁺ metal ions.
It could also be seen that Hg²⁺ metal ion is a good adsorbing
adsorbate as compared to Pb²⁺ and Zn²⁺ metal ions. The values of
Freundlich constants (n and k) are estimated from graph which are
found to be 1/n < 1 and k > I.