Absorption of Metals by Natural Polymers Generated from Seafood Processing Wastes

Abstract

The binding of metals to naturally occurring polymers obtained from seafood processing wastes was investigated. Experimental results show that chitin, chitosan, and scales from three species of fish such as porgy, flounder, and cod are potentially useful materials to remove metals from contaminated water. Such metals include copper, zinc, chromium, cadmium, and lead. Batch methods were used to study equilibrium isotherms and adsorption kinetics. The experimental data of adsorption equilibrium from solutions of metals have been found to correlate well with the three-parameter isotherm equation. The study of adsorption kinetics shows that the rates of adsorption of the metals toward the natural polymers are best Interpreted in terms of intraparticle diffusion as a rate-limiting step. Although the natural polymers mentioned are useful for treating waste water, It is advantageous to use the cross-linked form to counteract product solubilization in an acid environment. © 1984, American Chemical Society. All rights reserved.