Chitosan Functionalization with Amino Acids Yields to Higher Copper Ions Adsorption Capacity

Autor(es)

Mahl, Cynthia R. A. ^[1] ; Taketa, Thiago B. ^[1] ; Bataglioli, Rogerio A. ^[1] ; de Arruda, Eduardo Jose ^[2] ; Beppu, Marisa M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Fac Engn Quim, Ave Albert Einstein 500, BR-13083852 Campinas, SP - Brazil

^[2] Fundacao Univ Fed Grande Dourados, Rodovia Dourados Itahum, Km 12, BR-79804970 Dourados, MS - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF POLYMERS AND THE ENVIRONMENT; v. 26, n. 12, p. 4338-4349, DEC 2018.
• Citações Web of Science: 4

Resumo

Chitosan (Chi) beads were conjugated with three different amino acids {[}namely, glutamic acid (GLU), methionine (MET), and taurine (TAU)] aiming to increase the divalent copper ions uptake in aqueous media. Scanning Electron Microscopy evidenced the development of a large porous structure after amino acid functionalization, associated with the increase in a number of amino groups in the polymer backbone. X-Ray Photoelectron Spectroscopy and Fourier-Transform Infrared Spectra analyses were also employed to assess the conjugation of these three different amino acids in chitosan backbone. Adsorption experiments were conducted in a batch process, at 298K, and kinetic data indicated a slightly better fitting for the pseudo-first-order model when compared to pseudo-second order. Intraparticle diffusion model suggested a three-step mechanism for Cu(II) adsorption kinetics, limited by the third step, the intraparticle diffusion. The isotherm data fitting to the traditional Langmuir and Freundlich models indicated a better fit for the former case. The amino acid conjugation resulted in the increase of the maximum adsorption capacity for Cu(II) from 1.30mmolg(-1) prior to amino acid conjugation to values as high as 2.31mmolg(-1), 2.40mmolg(-1) and 2.68mmolg(-1) for Chi-TAU, Chi-GLU, and Chi-MET, respectively. These results are attributed to the introduction of additional amino groups and new carboxylate and amino acid residues into the chitosan backbone, which might also be explored for amino acid demanding applications. (AU)

• Processo FAPESP: 13/05135-1 - Recobrimentos antimicrobianos e nanoestruturados contendo quitosana produzidos pela técnica de automontagem (layer-by-layer) para substratos têxteis
• Beneficiário: Thiago Bezerra Taketa
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/10193-9 - Desenvolvimento de mecanismos de ativação e controle da liberação de fármacos em mochilas celulares para uso em terapias antitumorais
• Beneficiário: Rogério Aparecido Bataglioli
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto