Abstract
The development of a chitosan anion exchanger, obtained from shrimp shells, and its adsorption capacity for chloride, bromide, iodide and phosphate anions are provided. Dependence of exchange processes with the anions as a function of pH and contact time between exchanger and anions were initially investigated. Results showed that the best adsorption of ions occurred at pH 3.0. Exchange isotherms were then developed by the Langmuir, Freundlich and Dubinin-Radushkevich mathematical models. Results demonstrated that chitosan produced from shrimp shells may be used as feedstock in the manufacture of anion exchange microspheres.
Highlights
Biomasses are a renewable source of energy and highly interesting in research
The glycoside units that form chitin are united by β(1 4) bonds forming a linear polymeric chain with a polymerization degree of about 2000 to 4000 (McKAY, 1996)
It is important to highlight that the obtaining of chitin from byproducts of crustaceous industrialization is hardly used in Brazil which may be considered a
Summary
Biomasses are a renewable source of energy and highly interesting in research. The second most abundant polysaccharide in biomasses, is produced by several sea animals (such as crabs, shrimps, lobsters, etc.), insects and fungi (MUZZARELLI, 1978; MATHUR; NARANG, 1990; BECKER et al, 2000; OLIVEIRA; VIEIRA, 2006). One single chitin molecule contains two chains with intra- and inter-molecular hydrogen bonds and simulates the cellulose molecule with a bent conformation (MATHUR; NARANG, 1990; MUZZARELLI, 1978). Since the crustaceans are generally used as protein sources, the use of biopolymers as raw material for different industrial applications is essential (KIMURA et al, 1999; GONÇALVES JUNIOR, et al, 2010)
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