Application of chitosan to cobalt recovery: Evaluation by factorial design of experiments

Abstract

SynopsisA natural polymer in a commercially available form (chitosan) has been tested using a factorial design of experiments for its application to cobalt recovery either in hydrometallurgy and in analytical separations. A simple mechanically stirred system has been used, evaluating the influence of the contact time, iron (II), cobalt (II), chitosan concentration, salinity, and pH in the separation. The pH value has a dramatic influence on the metal recovery from a negligible amount of metals at pH = 1.0 to a quantitative sorption at pH = 3.0. Linear relationships between sorbed metal and the variables have been determined at constant pH value and a quantitative evaluation of the metal recovery at different pH values can be performed using the maximum sorption capacity of the chitosan ( u o ) and the selectivity for both metals. The obtained results allow the evaluation of the recovery of metals using chitosan as solid phase.

Sorption behavior of Pr and Nd upon chitosan benzoyl thiourea derivatives

“…Chitosan is used successfully for the removal of different cations from aqueous solutions supported by the presence of free amino groups in its structure (Chen, Xu, Zeng, & Yi, 2013) Q1 . Chitosan has been used in many works as adsorbent for different ions (Blazquez, Vicente, Gallo, Ortiz, & Irabien, 1987;Muzzarelli & Rocchetti, 1974;Onsoyen & Skaugrad, 1990;Sakaguchi, Horikoshi, & Nakajima, 1981). Also chitosan derivatives have been used with high adsorption capacity for the removal of different ions (Chu, 2002;Evans, Davids, MacRae, & Amirbahman, 2002;Guibal, 2004;Juang & Shao, 2002;Kumar, Muzzarelli, Muzzarelli, Sashiwa, & Domb, 2004;Wu, Tseng, & Juang, 2000).…”

Studies on Electrochemical Behavior of Bromideat a Chitosan-Modified Glassy Carbon Electrode

“…Chitosan, b-1,4-polyglucosamine, which is derived from chitin (a naturally occurring polysaccharide found in insects, arthropods and crustaceans) by deacetylation, has a high metal-chelating ability due to its amino and hydroxy groups. It can effectively adsorb not only metal ions [9][10][11][12][13][14] but also halogen and various organic substances [15][16][17][18][19]. It is a natural polymer and its chemical structure can be presented as follows:…”