Synthesis of chemically modified chitosans with a higher fatty acid glycidyl and their adsorption abilities for anionic and cationic dyes

Abstract

Novel chitosan-based materials with a higher fatty acid glycidyl as the chemically modified agent were synthesized and the adsorption ability of the resulting polymers has been evaluated for typical anionic and cationic dyes. The successful modification was confirmed by the infrared spectroscopic measurements. As the degree of substitution was decreased, the adsorption ability of the chemically modified chitosans for anionic dyes at the higher dye concentration was increased, and the modified chitosans with a lower degree of substitution showed a higher adsorption ability than that of an activated carbon at the higher dye concentration. For cationic dyes, the chemically modified chitosan showed a good adsorption power, especially when the adsorption power was evaluated by the flow methods. The improved adsorption ability of a chemically modified chitosan material was also confirmed by comparing it with that of a crosslinked chitosan material.

Reactive and basic dyes removal by sorption onto chitosan derivatives

“…In contrast, a limited number of references mention the removal of basic dyes by chitosan, presenting capacities between 30-600 mg/g [16][17][18]. As far as we know, only a few teams realized comparative studies for basic and reactive dyes removal by chitosan derivatives, revealing capacities ∼50 mg/g [19].…”

Adsorption of anionic dyes on chitosan grafted poly(alkyl methacrylate)s

“…Kc0 RL cationic dyes, methylene blue and malachite green using chitosan grafted poly(methacrylic acid) [15].…”

“…Jayakumar et al have presented a detailed review on graft copolymerized chitosan and their applications [8]. Chitosan has been grafted with poly(acrylic acid) [9], poly(methacrylic acid) [10,11], poly(methyl methacrylate) [12] and modified with montmorillonite [13], ␤-cyclodextrin [14], fatty acid glycidyl [15], and crosslinked with glutaraldehyde [16]. All these materials have been successfully used for the adsorption of metal ions and dyes.…”

Desenvolvimento, caracterização e avaliação de sistemas microestruturados para veiculação de ácido retinóico na pele

“…A quitosana é um polímero catiônico que apresenta grupos hidroxila e aminas livres tornando-o um composto altamente reativo (DON et al, 2001(DON et al, , 2002a. Vários relatos na literatura utilizam interações entre os grupos amina da quitosana e os grupos carboxilatos de vários ácidos carboxílicos e seus anidridos para obter compostos com características diferentes da molécula de quitosana original, particularmente para aumentar a solubilidade, melhorar propriedades mucoadesivas e preparar micro/nanopartículas (DON et al, 2005;BODNAR et al, 2005;SHIMIZU et al, 2005;KAST et al, 2001;ROGOVINA et al, 2000;SASHIWA et al, 2003). Vários estudos têm mostrado que polímeros com carga constituem bons agentes mucoadesivos (PARK; ROBINSON, 1984;CHIKENING;JACOB;MATHIOWITZ, 1992;CHIKENING;MATHIOWITZ, 1995;CH'NG et al, 1985).…”